CN116015489B - On-chip radio frequency signal processing circuit and transmission power calibration method - Google Patents
On-chip radio frequency signal processing circuit and transmission power calibration method Download PDFInfo
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Abstract
The invention provides an on-chip radio frequency signal processing circuit and a transmitting power calibration method, which relate to the technical field of wireless communication and comprise a digital-to-analog converter, a low-pass filter, a mixer, a power amplifier, a self-calibration source and a transmitter signal strength indicator, wherein the digital-to-analog converter, the low-pass filter and the mixer are sequentially connected, a target baseband signal is input into the power amplifier after low-pass filtering and up-mixing, the power amplifier amplifies the mixed signal and inputs into the transmitter signal strength indicator, and the transmitter signal strength indicator calibrates the transmitting power of the target baseband signal by taking the constant power of the self-calibration source as a reference; the transmit power calibration method includes the steps of obtaining a self-calibrating source constant power, and based on the constant power, calibrating the transmit power segment by a transmitter signal strength indicator. The invention can conveniently calibrate the transmitting power of the chips one by one.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to an on-chip radio frequency signal processing circuit and a transmit power calibration method.
Background
The radio frequency chip is mainly used for external communication of equipment, the accuracy of the transmitting power of the radio frequency chip needs to be controlled, and in actual use, the transmitting power of the radio frequency chip needs to be accurate to within +/-1 dBm or even 0.5dBm of a nominal value. However, due to the influence of factors such as inconsistent devices, temperature variation, aging of devices and the like, even if the same design is based on the same platform, different electrical properties are shown, in order to eliminate the influence, parameters are measured before delivery to obtain some parameter error data, the error data are stored, and when the device is actually used, the error data are read and used for compensating actual parameters so as to meet actual requirements.
In the linear calibration of the transmitting power of the radio frequency chip, complete calibration is carried out from high power to low power on a designated channel, so that the equipment can accurately output each power level required by a system, nonlinearity of the output of the wireless equipment is corrected, a mathematical model is built after multiple tests are required, the equipment is calibrated according to the mathematical model, and an own and accurate power level output formula of each equipment is obtained.
In the prior art, when calibrating the transmitting power of the radio frequency chip, a frequency spectrograph is usually externally connected to the radio frequency chip, and the transmitting power of the radio frequency chip is calibrated one by using the frequency spectrograph. However, this process requires a certain instrument calibration time, and is cumbersome to operate, and is difficult to adapt to the calibration of a large number of chips one by one. Therefore, it is necessary to develop a calibration circuit for the transmitting power of the radio frequency chip, which can calibrate the chips one by one conveniently.
Disclosure of Invention
The invention aims to provide an on-chip radio frequency signal processing circuit and a transmitting power calibration method, which can conveniently calibrate chips one by one.
In a first aspect, the present invention provides an on-chip radio frequency signal processing circuit, which adopts the following technical scheme:
The system comprises a digital-to-analog converter, a low-pass filter, a mixer, a power amplifier, a self-calibration source and a transmitter signal strength indicator;
The input end of the digital-to-analog converter is input with a target baseband signal, the output end of the digital-to-analog converter is connected with a low-pass filter, and the target baseband signal comprises an in-phase signal and a quadrature signal;
the mixer is used for mixing the in-phase signal filtered by the low-pass filter with the quadrature signal and inputting the mixed signal into the power amplifier;
The power amplifier amplifies the mixed signal and inputs the amplified mixed signal into the transmitter signal strength indicator;
The self-calibration source is used for generating a reference baseband signal with constant power and inputting the reference baseband signal to the transmitter signal strength indicator;
The transmitter signal strength indicator is provided with an M-gear piecewise linear attenuation network and is used for piecewise calibrating the transmitting power of the target baseband signal according to the constant power of the reference baseband signal;
the output value of the transmitter signal strength indicator indicates the strength of the calibrated baseband signal after calibration by the transmitter signal strength indicator.
Through adopting above-mentioned technical scheme, with radio frequency signal processing circuit integration in the radio frequency chip, when carrying out the transmission power calibration to the radio frequency chip, need not external spectrum appearance, improved the convenience when carrying out the calibration to the radio frequency chip transmission power, reduced the cost of chip test after encapsulating simultaneously.
When the signal processing circuit works, the input end of the digital-to-analog converter is connected with a target baseband signal, the digital-to-analog converter converts the digital signal into an analog signal and outputs the analog signal to the low-pass filter, the low-pass filter carries out low-pass filtering on the analog signal output by the digital-to-analog converter, then the analog signal is input to the mixer, the mixer mixes the in-phase signal and the quadrature signal after the low-pass filtering and outputs the mixed signal to the power amplifier, the power amplifier amplifies the mixed signal and then outputs the mixed signal to the transmitter signal strength indicator, the transmitter signal strength indicator carries out piecewise linear attenuation network to carry out piecewise calibration on the transmitting power of the target baseband signal, and the self-calibration source is used for generating a reference baseband signal with constant power of the reference baseband signal and takes the constant power of the reference baseband signal as the reference power for the transmitter signal strength indicator to carry out piecewise calibration.
Optionally, the on-chip radio frequency signal processing circuit further comprises a transimpedance amplifier, a programmable gain amplifier and an analog-to-digital converter;
The transimpedance amplifier receives the calibration baseband signal, performs transimpedance amplification on the calibration baseband signal, and inputs the calibration baseband signal after transimpedance amplification to the programmable gain amplifier;
the programmable gain amplifier receives the transimpedance-amplified calibration baseband signal, performs operational amplification on the transimpedance-amplified calibration baseband signal, and inputs the operational-amplified calibration baseband signal to the analog-to-digital converter;
the analog-to-digital converter receives the operational amplified calibration baseband signal, and the output value indicates the intensity of the calibration baseband signal calibrated by the transmitter signal intensity indicator.
By adopting the technical scheme, the transmitter signal strength indicator outputs signals to the transimpedance amplifier, after the transimpedance amplifier amplifies the output signals of the transmitter signal strength indicator, the programmable gain amplifier receives the output signals of the transimpedance amplifier and amplifies the output signals, the output signals are output through the analog-to-digital converter, and the output of the analog-to-digital converter indicates the output signal strength of the transmitter signal strength indicator.
In a second aspect, the present invention provides a method for calibrating transmit power, comprising the steps of:
Obtaining constant power of a self-calibration source output reference baseband signal;
based on the constant power, the transmitting power of the target baseband signal is calibrated from large to small according to an M-gear piecewise linear attenuation network of a transmitter signal strength indicator.
By adopting the technical scheme, the constant power when the self-calibration source outputs the reference baseband signal is obtained, the constant power is used as a reference, the transmitting power of the target baseband signal is aligned with the constant power according to the piecewise linear attenuation network in the transmitter signal strength indicator, and the target baseband signal is calibrated according to the piecewise linear attenuation network from high power to low power in multiple sections, so that the calibration accuracy of the transmitting power of the target baseband signal can be improved, and the linearity degree of the transmitting power after the calibration can be improved.
Optionally, the attenuation of the attenuation network of the transmitter signal strength indicator is 0 when the constant power of the reference baseband signal of the self-calibrating source is obtained.
By adopting the technical scheme, when the constant power of the self-calibration source is obtained, the attenuation of the attenuation network of the signal strength indicator of the transmitter is adjusted to be 0 in advance, so that the output temperature of the signal strength indicator of the transmitter can be increased, and the alignment accuracy can be improved in the process of aligning the transmitting power of the target baseband signal with the constant power.
Optionally, the obtaining the constant power of the reference baseband signal of the self-calibration source includes obtaining the reference baseband signal of the transmitter signal strength indicator under the constant power of the self-calibration source and the mixed signal of the power amplifier respectively, outputting the signals as a first output value and a second output value respectively, and adjusting the mixed signal strength of the power amplifier so that the first output value is equal to the second output value, wherein the constant power of the self-calibration source is equal to the output power of the power amplifier under the current mixed signal strength.
By adopting the technical scheme, when constant power of the self-calibration source under the reference baseband signal is obtained, the reference baseband signal output by the self-calibration source under the constant power and the mixed signal of the power amplifier are respectively input into the transmitter signal strength indicator, the transmitter signal strength indicator outputs a first output value and a second output value which are respectively used for indicating the reference baseband signal strength and the mixed signal strength, the mixed signal strength of the power amplifier is regulated so that the first output value and the second output value are equal, and at the moment, the constant power of the self-calibration source is equal to the output power of the power amplifier under the current mixed signal strength. Thereby, a constant power of the self-calibrating source output reference baseband signal is obtained.
Optionally, the obtaining constant power of the self-calibration source output reference baseband signal includes the following steps:
S110, the transmitter signal strength indicator receives a reference baseband signal of the self-calibration source under constant power, and the output of the transmitter signal strength indicator is a first output value;
S120, the transmitter signal strength indicator receives the mixed signal of the power amplifier, and the output of the transmitter signal strength indicator is a second output value;
S130, adjusting the signal intensity of the mixed signal output by the power amplifier until the second output value is equal to the first output value, wherein the constant power of the self-calibration source is equal to the output power of the power amplifier under the current mixed signal intensity.
By adopting the technical scheme, when constant power of the self-calibration source under the reference baseband signal is obtained, the reference baseband signal output by the self-calibration source under the constant power is input to the transmitter signal strength indicator in advance, the transmitter signal strength indicator receives and outputs a first output value, the first output value indicates the strength of the reference baseband signal, the mixing signal of the power amplifier is input to the transmitter signal strength indicator, the transmitter signal strength indicator outputs a second output value, the second output value indicates the strength of the mixing signal, and the signal strength of the mixing signal output by the power amplifier is regulated, so that the second output value is regulated to be equal to the first output value, and the output power of the power amplifier when outputting the current mixing signal is equal to the constant power of the self-calibration source. Thereby, a constant power of the self-calibrating source output reference baseband signal is obtained.
Optionally, in S110, the transmitter signal strength indicator and the self-calibration source are in a working state, and the power amplifier is turned off, and in S120, the transmitter signal strength indicator and the power amplifier are in a working state, and the self-calibration source is turned off.
Optionally, in S110, before the self-calibration source operates, a dc offset correction is performed on the transmitter signal strength indicator.
Optionally, the step of calibrating the transmitting power of the target baseband signal from large to small according to the M-gear piecewise linear attenuation network of the transmitter signal strength indicator based on the constant power includes:
Adjusting the output power of the power amplifier to be a reference power based on a constant power, wherein the reference power has a deviation from the constant power, and the deviation is less than 1%;
Sequentially adjusting the attenuation network of the transmitter signal strength indicator from the high attenuation degree to the low attenuation degree, linearly reducing the output power of the power amplifier, and adjusting the transmission power of the target baseband signal from the high attenuation degree to the low attenuation degree in a segmented manner by the transmitter signal strength indicator;
the output value of the transmitter signal strength indicator indicates the baseband strength of the calibration signal, and the output power of the power amplifier after the linear reduction corresponds to the output value of the transmitter signal strength indicator to form a linear calibration function.
By adopting the technical scheme, when the transmitting power of the target baseband signal is subjected to piecewise calibration, the output power of the power amplifier is adjusted to be the reference power based on the constant power of the self-calibration source, the mixed signal strength output by the power amplifier is the signal strength output under the reference power, the deviation between the reference power and the constant power is less than 1%, the maximum power which is linearly calibrated by the reference power is subjected to piecewise calibration according to the piecewise attenuation network of the transmitter signal strength indicator, the output power of the power amplifier is gradually reduced, so that the output value of the transmitter signal strength indicator is correspondingly reduced, and the output power of the power amplifier and the output value of the transmitter signal strength indicator form a linear calibration function.
Optionally, the step of calibrating the transmitting power of the target baseband signal from large to small according to the M-gear piecewise linear attenuation network of the transmitter signal strength indicator based on the constant power includes the following steps:
S210, the self-calibration source and the transmitter signal strength indicator work, and a gear with the attenuation degree of an attenuation network of the transmitter signal strength indicator being maximum is adjusted; the transmitter signal strength indicator receives a reference signal output by the self-calibration source under reference power, the reference signal is attenuated by the transmitter signal strength indicator, and the output of the transmitter signal strength indicator indicates the strength of the attenuated reference signal and is output as a third output value;
S220, the self-calibration source is closed, the power amplifier is opened, and a gear with the maximum attenuation degree of an attenuation network of the transmitter signal strength indicator is maintained; the transmitter signal strength indicator receives the mixed signal output by the power amplifier, outputs an attenuated mixed signal, and outputs a fourth output value to the attenuated mixed signal;
S230, adjusting the signal intensity of the mixed signal output by the power amplifier until the fourth output value is equal to the third output value, wherein the output power of the power amplifier for outputting the current mixed signal intensity is equal to the sum of the reference power and the balun loss;
And S240, the attenuation degree of the attenuation network of the transmitter signal strength indicator is sequentially adjusted from large to small, the mixed signal strength output by the power amplifier is gradually reduced in the linear interval of each attenuation network, and the output value of the transmitter signal strength indicator and the output power of the power amplifier output corresponding to the mixed signal strength form a multi-section linear calibration function.
By adopting the technical scheme, when the transmitting power of the target baseband signal is calibrated in a segmented mode, the gear of the maximum attenuation degree of the attenuation network of the transmitter signal strength indicator is adjusted in advance, the self-calibration source outputs a reference signal under the reference power, the transmitter signal strength indicator receives the reference signal and then attenuates and outputs the reference signal to a third output value, the self-calibration source is closed, the power amplifier is started, the power amplifier inputs a mixing signal to the transmitter signal strength indicator, the transmitter signal strength indicator receives the mixing signal and then attenuates and outputs the mixing signal to a fourth output value, the signal strength of the mixing signal is adjusted, the fourth output value is equal to the third output value, the output power of the power amplifier is equal to the sum of the reference power and the balun loss, the output power of the power amplifier is the maximum power at the moment, the attenuation degree of the attenuation network of the transmitter signal strength indicator is sequentially adjusted from large to small, the output power of the power amplifier is gradually reduced in a linear interval of each stage of the attenuation network, the output value of the transmitter signal strength indicator corresponds to the output power of the power amplifier, and a multistage calibration function is formed.
The on-chip radio frequency signal processing circuit and the transmitting power calibration method provided by the invention have at least one of the following beneficial technical effects:
(1) By arranging the radio frequency signal processing circuit in the radio frequency chip, an external spectrometer is not required when the transmitting power of the radio frequency chip is calibrated, the testing cost of the packaged chips can be reduced, and the efficiency of calibrating the chips one by one is improved;
(2) Setting a transmitter signal intensity indication in a calibration circuit, wherein the transmitter signal intensity indication is provided with M-grade piecewise linear attenuation networks, so that the transmission power of radio frequency can be piecewise calibrated from high power to low power according to the piecewise linear attenuation networks, and a corresponding linear calibration function is obtained;
(3) When the transmitting power is calibrated in a segmented mode, the output power of the self-calibration source is obtained first, the output power of the self-calibration source is used as reference power, the transmitting power is calibrated in a segmented mode according to the signal strength indication attenuation network of the transmitter, and accuracy and convenience for calibrating the transmitting power are improved.
Drawings
FIG. 1 is a block diagram of an on-chip RF signal processing circuit in an embodiment of the invention;
FIG. 2 is a schematic diagram of an on-chip RF signal processing circuit according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for calibrating transmit power in an embodiment of the invention;
fig. 4 is a flowchart of S100 in a transmit power calibration method according to an embodiment of the present invention;
Fig. 5 is a flowchart of S200 in a transmit power calibration method according to an embodiment of the present invention;
fig. 6 is a linear calibration graph of a transmit power calibration method in an embodiment of the invention.
Reference numerals illustrate:
1. Digital-to-analog converter, 2, low-pass filter, 3, mixer, 4, power amplifier, 5, transmitter signal strength indicator, 6, self-calibration source, 7, trans-impedance amplifier, 8, programmable gain amplifier, 9, analog-to-digital converter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and the like means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof without precluding other elements or items.
The embodiment of the invention provides an on-chip radio frequency signal processing circuit.
Referring to fig. 1 and 2, the on-chip radio frequency signal processing circuit includes a digital-to-analog converter 1 (Digital to Analog Converter, DAC), a Low-pass filter 2 (Low-PASS FILTER, LPF), a mixer 3, a Power Amplifier 4 (PA), and a transmitter signal strength indicator 5 (TRANSMITTER SIGNAL STRENGTH Indication, TSSI).
Referring to fig. 1 and 2, a target baseband signal is input to an input end of a digital-to-analog converter 1, wherein the target baseband signal is a signal to be calibrated output by a radio frequency chip, and comprises an in-phase signal and a quadrature signal. The digital-to-analog converter 1 converts the digital signal into an analog signal and outputs the analog signal to the low-pass filter 2, the low-pass filter 2 low-pass filters the digital-to-analog converted in-phase signal and quadrature signal and inputs the same to the mixer 3, and the mixer 3 mixes the low-pass filtered in-phase signal and quadrature signal and inputs the mixed signal to the power amplifier 4. After receiving the mixed signal, the power amplifier 4 amplifies the mixed signal and inputs the amplified mixed signal to the transmitter signal strength indicator 5.
An M-stage piecewise linear attenuation network is arranged in the transmitter signal strength indicator 5, and the attenuation network (TRANSMITTER SIGNAL STRENGTH Indication Attenuation, TSSI-Att) of the transmitter signal strength indicator 5 is used for piecewise calibrating the transmitting power of the target baseband signal. In the embodiment of the invention, three-gear piecewise linear attenuation networks, namely 00, 01 and 11 gears, are arranged in the transmitter signal strength indicator 5, the attenuation degrees of the 00, 01 and 11 gears are sequentially increased from zero, and in some other embodiments, four-gear piecewise linear attenuation networks, namely 00, 01, 10 and 11 gears, are also arranged in the transmitter signal strength indicator 5, and the attenuation degrees of the 00, 01, 10 and 11 gears are sequentially increased from zero.
Referring to fig. 1 and 2, the on-chip radio frequency signal processing circuit further includes a self-calibration source 6 (Self Calibration Source, SCS), the self-calibration source 6 is connected to the transmitter signal strength indicator 5, the self-calibration source 6 is configured to output a reference baseband signal to the transmitter signal strength indicator 5, and the transmitter signal strength indicator 5 performs a piecewise calibration on the transmission power of the target baseband signal according to a constant power when the self-calibration source 6 outputs the reference baseband signal as a reference.
Referring to fig. 1 and 2, the on-chip radio frequency signal processing circuit further includes a transimpedance amplifier 7 (Trans-IMPEDANCE AMPLIFIER, TIA), a Programmable gain amplifier 8 (Programmable GAIN AMPLIFIER, PGA), and an analog-to-digital converter 9 (Analog to Digital Converter, ADC), the transimpedance amplifier 7 receiving and transimpedance amplifying the signal output from the transmitter signal strength indicator 5, the Programmable gain amplifier 8 receiving and operational amplifying the signal output from the transimpedance amplifier 7, the analog-to-digital converter 9 receiving and converting the output signal of the Programmable gain amplifier 8 into a digital signal, the output value of the analog-to-digital converter 9 indicating the output signal strength of the transmitter signal strength indicator 5.
Referring to fig. 3 to 6, an embodiment of the present invention further provides a transmit power calibration method, which is applied to the on-chip radio frequency signal processing circuit, and includes the following steps:
S100, obtaining constant power of the reference baseband signal output by the self-calibration source 6:
S110, enabling a transmitter signal strength indicator 5, adjusting an attenuation network of the transmitter signal strength indicator 5 to be 00 grades after direct current offset correction (DC Offset Cancellation, DCOC) is carried out on the transmitter signal strength indicator 5, enabling a self-calibration source 6 to be started and adjusting the gain of a programmable gain amplifier 8 to be 0dB, outputting a reference baseband signal by the self-calibration source 6 under the constant power of the self-calibration source 6, receiving the reference baseband signal output by the self-calibration source 6 by the transmitter signal strength indicator 5, and outputting the output signal of the transmitter signal strength indicator 5 to be D-SCS after sequentially passing through a transimpedance amplifier 7, the programmable gain amplifier 8 and an analog-to-digital converter 9;
S120, closing a self-calibration source 6, starting a power amplifier 4, keeping an attenuation network of a transmitter signal strength indicator 5 at 00 grades, and keeping the gain of a programmable gain amplifier 8 at 0dB, wherein a digital-to-analog converter 1, a low-pass filter 2 and a mixer 3 perform digital-to-analog conversion, low-pass filtering and mixing on a target baseband signal, then input the target baseband signal to the power amplifier 4, the transmitter signal strength indicator 5 receives a mixed signal amplified by the power amplifier 4, and an output signal of the transmitter signal strength indicator 5 sequentially passes through a transimpedance amplifier 7, a programmable gain amplifier 8 and an analog-to-digital converter 9 and then is output as D-PA;
S130, adjusting the amplification factor of the power amplifier 4, so as to change the signal intensity of the mixed signal output by the power amplifier 4 until D-PA is equal to D-SCS, wherein the signal intensity of the mixed signal output by the power amplifier 4 is equal to the reference baseband signal intensity output by the self-calibration source 6 under constant power, and the constant power of the self-calibration source 6 is equal to the output power of the power amplifier 4 at the moment;
S200, based on the constant power of the self-calibration source 6, calibrating the transmission power of the target baseband signal in three segments according to a three-stage piecewise linear attenuation network in the transmitter signal strength indicator 5:
S210, enabling a transmitter signal strength indicator 5, adjusting an attenuation network of the transmitter signal strength indicator 5 to be 11 grades, wherein 11 grades are the maximum attenuation grade of the attenuation network of the transmitter signal strength indicator 5, enabling a self-calibration source 6 when a power amplifier 4 is in an off state, outputting a reference signal by the self-calibration source 6 under reference power, receiving the reference signal by the transmitter signal strength indicator 5, attenuating the reference signal, and outputting the attenuated reference signal to be D-SCS-ATT-11 after sequentially passing through a transimpedance amplifier 7, a programmable gain amplifier 8 and an analog-digital converter 9, wherein D-SCS-ATT-11 indicates that the transmitter signal strength indicator 5 is under the reference signal and the attenuation network is the output signal strength of 11 grades, and the reference power and the constant power of the self-calibration source 6 have deviation and the deviation is less than 1%;
S220, closing the self-calibration source 6, starting the power amplifier 4, keeping the attenuation network of the transmitter signal strength indicator 5 at 11 grades, sequentially passing the target baseband signal through the digital-to-analog converter 1, the low-pass filter 2 and the mixer 3 to obtain a mixed signal, inputting the mixed signal into the power amplifier 4, amplifying the mixed signal by the power amplifier 4, receiving the mixed signal amplified by the power amplifier 4 by the transmitter signal strength indicator 5, attenuating the mixed signal by the attenuation network, and sequentially outputting the output of the transmitter signal strength indicator 5 to D-PA-ATT-11 after passing through the transimpedance amplifier 7, the programmable gain amplifier 8 and the analog-to-digital converter 9;
S230, adjusting the amplification factor of the power amplifier 4, so as to change the signal intensity of the mixed signal output by the power amplifier 4 until D-PA-ATT-11 is equal to D-SCS-ATT-11, wherein the output power of the mixed signal intensity output by the power amplifier 4 is equal to the sum of the reference power of the self-calibration source 6 and the balun loss, and the output power of the power amplifier 4 is recorded as PRF-0;
S240, keeping the attenuation network of the transmitter signal strength indicator 5 at 11 grades, gradually reducing the output power of the power amplifier 4 at intervals of 0.5dBm, and recording that the output power of the power amplifier 4 is PRF-1 when the output power of the power amplifier 4 is reduced to the linear boundary value of the attenuation network 11 grades of the transmitter signal strength indicator 5;
s250, maintaining the output power of the power amplifier 4 as PRF-1, adjusting the attenuation network of the transmitter signal strength indicator 5 to be 01 grade, gradually reducing the output power of the power amplifier 4 at intervals of 0.5dBm, recording the output power of the power amplifier 4 as PRF-2 when the output power of the power amplifier 4 is reduced to the linear boundary value of the attenuation network 01 grade of the transmitter signal strength indicator 5, and obtaining the linear calibration function between PRF-2 and PRF-1 after the output value of the signal output by the transmitter signal strength indicator 5 sequentially passes through the transimpedance amplifier 7, the programmable gain amplifier 8 and the analog-to-digital converter 9 and corresponds to the output power of the power amplifier 4 and is subjected to linear fitting;
And S260, maintaining the output power of the power amplifier 4 as PRF-2, adjusting an attenuation network of the transmitter signal strength indicator 5 to be 00 grades, gradually reducing the output power of the power amplifier 4 at intervals of 0.5dBm to obtain PRF-3, and obtaining a linear calibration function between PRF-3 and PRF-2 after the output value of the signal output by the transmitter signal strength indicator 5 sequentially passes through the transimpedance amplifier 7, the programmable gain amplifier 8 and the analog-digital converter 9 and corresponds to the output power of the power amplifier 4 and is subjected to linear fitting.
While embodiments of the present invention have been described in detail hereinabove, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. It is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
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| CN108400823A (en) * | 2018-02-27 | 2018-08-14 | 四川斐讯信息技术有限公司 | A kind of calibration method and equipment of radio-frequency emission power |
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