CN1266968C - Method of calibrating mobile phone with automatic energy control function and calibrating system thereof - Google Patents

Abstract

A method for calibrating a mobile phone having an automatic power control function and a calibration system thereof. The mobile phone stores I Digital Analog Conversion (DAC) control values, which are used to determine I output powers. First, K DAC control values for testing are selected optionally, and K output powers for testing of the mobile phone corresponding to the K DAC values for testing are measured. Then, a main output power function is determined according to the K test DAC values and the K test output powers. Then, according to the main output power function, I corrected DAC control values corresponding to I rated output power values meeting the specification of a communication specification are obtained. Then, the I corrected DAC control values are stored in the mobile phone instead of the original I DAC control values.

Description

Method of calibrating mobile phone with automatic energy control function and calibrating system thereof

(1) Technical field

The present invention relates to a calibration method and a calibration system, and in particular to a calibration method and a calibration system for calibrating a mobile phone with an automatic energy control function.

(2) Background technology

Please refer to FIG. 1 , which is a schematic diagram of a conventional production line 100 for radio frequency (Radio Frequency, RF) calibration. The production and calibration process of a general mobile phone is as follows. Firstly, in the circuit board component configuration station (stage) 102, the main components of the mobile phone are fixed on the circuit board, and the main components include a Device Under Test (DUT), such as an RF antenna. Next, in the RF calibration station 104, the output power of the RF antenna is calibrated. If the output power of the RF antenna does not meet the communication specifications, such as the European Telecommunications Standards Institute (ETSI) Power Control Specification (Power Control Specification), the circuit board will be sent to the RF repair trimming station outside the production line 100 108 ; if the output power of the RF antenna meets the communication specification, then the circuit board will be sent to the RF final test station 106 . In the RF repair and trim station 108, the circuit board will be repaired and the output power of the RF antenna will be fine-tuned. If the repair is successful, the circuit board will be sent to the RF final test station 106 , otherwise, the circuit board will be classified as defective. In the RF final test station 106, the circuit board will be assembled in the mobile phone first, and then the overall final test of the mobile phone will be performed. If the mobile phone passes the final test, the mobile phone is a good product, otherwise it is a defective product.

In the GSM system, each Time Division Multiple Access (TDMA) code frame (frame) is divided into several time slots (time slots), and each time slot is called a burst (Burst). Please refer to FIG. 2A , which is a structural diagram of the power versus time of the burst. Each burst can be divided into three parts: ramp up portion 202 , burst portion 204 and ramp down portion 206 . In ETSI, the power of the burst unit 204 can have 32 power levels, and the 32 power levels are controlled by 32 power control levels.

Please refer to FIG. 2B , which is a comparison table of 32 power control levels of the GSM400/GSM900/GSM850 system and the normal output power of the mobile phone. In FIG. 2B , the normal value (normal) and the maximum value (extreme) of the tolerance value (tolerance) of the rated output power are shown. When the mobile phone has the function of Automatic Power Control (APC), the base station will command the mobile phone to automatically adjust the transmission power of its wireless signal according to the status of the received wireless signal at any time. That is, the mobile phone automatically selects different power control levels according to the distance from the base station, so as to generate appropriate output power to communicate with the base station.

Please refer to FIG. 3 , which is a partial system block diagram of the mobile phone for generating the burst shown in FIG. 2A . Random-access memory (Random-Access Memory, RAM) 302 stores multiple groups of characters (words), and after the multiple groups of characters are processed by a pulse shaper (pulse shaper) 304, an upward slope corresponding to the pulse group in FIG. 2A is generated. Section 202 and downslope section 206 voltage. The Digital to Analog Conversion (DAC) control value register 306 stores 32 DAC control values corresponding to 32 power control stages. The power level converter (power level converter) 308 is used to select one of the 32 DAC control values stored in the DAC control value register 306 and generate a corresponding voltage. The output voltage of the pulse shaper 304 is multiplied by the output voltage of the power level converter 308, and the signal processed by the power amplifier (power amplifier) 310 will control the RF antenna 312, so that the RF antenna 312 generates a signal corresponding to the selected signal. The DAC controls the value of the output power.

However, due to different models of mobile phones, the DAC control values corresponding to the 32 output powers are different. Even, due to differences in manufacturing processes, even two mobile phones of the same model may produce different output powers with the same DAC control value. Please refer to FIG. 4 , which shows characteristic curves 402 and 404 respectively corresponding to two mobile phones. Even though the DAC control values are both D(a), the output powers of the two mobile phones will be PL(a) and PL(b), respectively. Therefore, during the manufacturing process, calibration must be performed in the RF calibration station 104 shown in FIG. 1 . The traditional method is to use the trial and error method (try and error) to adjust various parameters in the mobile phone so that the output power of the mobile phone meets the requirements of the communication specification. If it cannot be corrected successfully, it is usually necessary to perform repair and fine-tuning in the RF repair and fine-tuning station 108 outside the production line 100 . However, traditional calibration methods are time-consuming and have low yields.

(3) Contents of the invention

In view of this, the object of the present invention is to provide a method for calibrating a mobile phone with an automatic energy control function and a calibrating system thereof, so as to quickly complete calibrating and greatly improve product yield.

According to one aspect of the present invention, a method for calibrating a mobile phone with an automatic energy control function is proposed, which is used to correct I output powers of an antenna corresponding to I power control stages of a mobile phone, where I is a positive integer, the The mobile phone stores 1 digital-to-analog conversion (DAC) control value, and the 1 DAC control value is used to determine the 1 output power. The correction method includes: (a) optional K test DAC control values, and Measure the K test output powers of the mobile phone corresponding to the K test DAC values, and K is a positive integer less than 1; K) and the K test output powers PHY(1)~PHY(K), determine all coefficients of a main output power function to obtain the main output power function P(x); (c) according to the main output power The function P(x) obtains I corrected DAC control values corresponding to I output power ratings, wherein the I output power ratings meet the requirements of a communication specification; and (d) correcting the I The latter DAC control value replaces the one DAC control value and is stored in the mobile phone.

According to another aspect of the present invention, a calibration system for calibrating a mobile phone with an automatic energy control function is proposed, which is used to calibrate I output powers of an antenna corresponding to I power control stages of a mobile phone, and I is A positive integer, the mobile phone stores 1 digital-to-analog conversion (DAC) control value, and the 1 DAC control value is used to determine the 1 output power. The calibration system includes: a wireless signal measuring device for measuring Measuring the output power emitted by the mobile phone; and a host computer with an RF calibration software system for calibrating the mobile phone and electrically coupled with the wireless signal measuring device to receive measurements from the wireless signal measuring device Result; wherein, executing the RF correction software system includes: (a) the host selects K test DAC control values, and then the wireless signal measurement device measures the mobile phone corresponding to the K test DAC values K test output powers, K is a positive integer less than 1; (b) the mainframe is based on the K test DAC values D(1)~D(K) and the K test output power PHY(1) ~PHY(K, determine all the coefficients of a main output power function to obtain the main output power function P(x); (c) the host obtains I output power ratings according to the main output power function P(x) The corresponding one corrected DAC control value, wherein, the one output power rating is in compliance with a communication specification; and (d) the host computer replaces the one corrected DAC control value by the one DAC control value , stored on the mobile phone.

In order to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below and described in detail with accompanying drawings.

(4) Description of drawings

Figure 1 is a schematic diagram of a traditional production line for radio frequency calibration;

Fig. 2A is the structural diagram of the power of burst to time;

Fig. 2B is a comparison table of 32 power control levels of the GSM400/GSM900/GSM850 system and the output power rating of the mobile phone;

Fig. 3 is a partial system block diagram of a mobile phone for generating the burst shown in Fig. 2;

Fig. 4 is the characteristic curve corresponding to two mobile phones;

Fig. 5 is a block diagram of a calibration system for calibrating a mobile phone with an automatic energy control function according to a preferred embodiment of the present invention;

FIG. 6 is a flow chart of a first calibration method performed by the calibration system of FIG. 5;

Fig. 7 is the flowchart of the second correction method of the present invention;

8A to 8C are an example of the function curves of the main output power function P(x) and the fine-tuning output power function Pf(x) when implementing the second calibration method of the present invention; and

Fig. 9 is a schematic diagram of a production line for performing radio frequency correction according to the present invention.

(5) specific implementation

It can be seen from the characteristic curves of output power versus DAC control value of the two mobile phones in Fig. 4 that although each mobile phone has different characteristic curves, their characteristic curves are quite similar. The present invention uses a main output power function to represent the characteristic curve of each mobile phone, and uses the main output power function to obtain a suitable DAC control value to quickly complete the correction action and improve the product yield.

Please refer to FIG. 5 , which is a block diagram of a calibration system for calibrating a mobile phone with an automatic energy control function according to a preferred embodiment of the present invention. The calibration system 500 of the present invention includes a wireless signal measuring device 502 and a host 504 . The calibration system 500 is used to calibrate one output power (output power) of the RF antenna 312 corresponding to one power control level (power control level) of a mobile phone 506, where I is a positive integer. In the ETSI power control specification, the value of I is 32. The DAC control value register 306 of the mobile phone 506 stores one digital-to-analog conversion (DAC) control value, and the one DAC control value is used to determine one output power. The wireless signal measurement device 502 is used to measure the output power transmitted by the mobile phone 506 . The host 504 has an RF calibration software system for calibrating the mobile phone 506 , and is used for calibrating the mobile phone 506 and receiving the measurement results from the wireless signal measuring device 502 .

Please refer to FIG. 6 , which is a flow chart of the first calibration method executed by the calibration system of FIG. 5 . When performing calibration, step 602 is first performed, the host 504 selects K test DAC control values D(1)~D(K), and then the wireless signal measurement device 502 measures the K test DAC values D(1 )~D(K) corresponding to K test output power PHY(1)~PHY(K) of the mobile phone, K is a positive integer less than 1. That is to say, referring to FIG. 3, the power level converter 308 processes the K test DAC values D(1)~D(K) respectively, so that the RF antenna 312 outputs K corresponding output powers PHY( 1)~PHY(K). Then, the wireless signal measuring device 502 measures K output powers of the RF antenna 312 to obtain K test output powers PHY( 1 )˜PHY(K) and record them in the host 504 . Wherein, the K test DAC control values may be K DAC control values selected from the I DAC control values originally stored in the DAC control value register of the mobile phone 506 .

Next, step 604 is executed, the host 504 determines a main output power function P(x ). The main output power function P(x) can be a polynomial function, which can be expressed as:

P(x)＝a _r *x ^r +a _r-1 *x ^r-1 +…+a ₁ *x+a ₀ (Formula 1)

Among them, x represents the DAC control value, and r is a positive integer. By making x equal to D(1)˜D(K) respectively, and P(x) equal to PHY(1)˜PHY(K) respectively, the coefficients a _{r˜a 0} of the polynomial function can be obtained.

Then, enter step 606, the host 504 obtains I corrected DAC control values CD(1)~CD corresponding to I output power rated values N(1)~N(I) according to the main output power function P(x). (I). Wherein, the I rated output power values N(1)˜N(I) conform to communication specifications, such as ETSI power control specifications. One output power rating is, for example, 32 output power ratings corresponding to the 32 power control levels shown in FIG. 2B , wherein some power control levels correspond to the same output power rating. In step 606, first set P(x)=N(1) to obtain the value of x, and the value of x is equal to CD(1). Then, set P(x)=N(2), N(3)...N(I) in sequence, and calculate the value of x respectively, and then CD(2)~CD(I) can be obtained.

Afterwards, step 608 is executed, please refer to FIG. 3 simultaneously, and verify (verify) when the power level converter 308 of the mobile phone 506 reads the DAC control values CD(1)˜CD(I) respectively after this correction, so that RF When the antenna 312 sends out a wireless signal, whether the output power PW(1)~PW(I) of the wireless signal is consistent with I output power ratings N(1)~N(I) respectively, that is, it is judged whether the PW(1) )~PW(I) is close to N(1)~N(I), and the difference is less than the tolerance value of the output power rating. If yes, it means that the I calibrated DAC control values CD(1)~CD(I) can make the output power of the wireless signal transmitted by the mobile phone 506 meet the requirements of the communication protocol. At this point, step 610 can be executed next, the host 504 replaces one DAC control value D(1) originally stored in the DAC control value temporary register 306 with one corrected DAC control value CD(1)˜CD(I) ~D(I), stored in the DAC control value register 306 of the mobile phone.

If any one of the I corrected DAC control values CD(1)~CD(I) corresponds to the output power PW(1)~PW(I) and the output power rating N(1)~N(I) If they do not match, the second correction method of the present invention can be used for fine-tuning. In addition, the second calibration method of the present invention can also be used to achieve more accurate calibration.

Please refer to FIG. 7 , which is a flow chart of the second calibration method of the present invention. Steps 702-708 are the same as steps 602-608 respectively, and will not be repeated here. After step 708, proceed to step 710 to determine whether to perform fine adjustment. The way of judging is assuming that the j-th corrected DAC control value CD(j) is one of the I corrected DAC control values CD(1)~CD(I), when it is judged that the j-th corrected DAC control value When the jth output power PW(j) corresponding to CD(j) does not match the jth output power rated value N(j), fine-tuning can be performed, and step 712 is entered. Otherwise, go to step 714.

In step 712, fine-tuning is performed. The fine-tuning method includes: firstly, the host 504 determines a fine-tuning output power according to the j-th corrected DAC control value CD(j), the j-th output power PW(j) and the j-th output power rated value N(j). Function Pf(x). The fine-tuning output power function Pf(x) can be a polynomial function, which can be expressed as:

Pf(x)＝b _s *x ^s +b _s-1 *x ^s-1 +…+b ₁ *x+b ₀ (Formula 2)

Wherein, the coefficients b _s ~b ₁ can be obtained by setting x=CD(j), Pf(x)=PW(j), and using the jth output power rating N(j). And the value of s is a value smaller than r. This is because the fine-tuning output power function Pf(x) has the locality of the characteristic curve, so Pf(x) can use a polynomial of a smaller power to approximate the characteristics around the jth corrected DAC control value CD(j) curve.

Then, the host 504 obtains the jth fine-tuned DAC control value FD(j) according to the jth rated output power value N(j) by fine-tuning the output power function Pf(x). That is, by setting Pf(x)=N(j), x is solved, and the value of x is the desired jth fine-tuned DAC control value FD(j). Then go to step 714 .

In step 714, the host 504 replaces the j th corrected DAC control value CD(j) with the j th fine-tuned DAC control value FD(j), and stores it in the DAC control value register 306 of the mobile phone. The other calibrated DAC control values are also stored in the DAC control value register 306 of the mobile phone at the same time.

In addition, in step 710, even if the output powers PW(1)~PW(I) corresponding to all the corrected DAC control values CD(1)~CD(I) and the rated output power values N(1)~N( When I) are consistent, fine-tuning can still be performed to obtain more accurate fine-tuned DAC control values FD(1)~FD(I). Assuming that the jth output power PW(j) corresponding to the jth corrected DAC control value CD(j) is to be more accurately approached to the jth output power rated value N(j), step 712 is executed to perform fine adjustment . Likewise, the above fine-tuning method can be used to obtain the jth fine-tuned DAC control value FD(j). Then, enter step 714, the host 504 replaces the j th corrected DAC control value CD(j) with the j th fine-tuned DAC control value FD(j), and stores it in the DAC control value register 306 of the mobile phone.

An example is given to describe the second calibration method of the present invention. Please refer to FIG. 8A to FIG. 8C , which show an example of the function curves of the main output power function P(x) and the fine-tuning output power function Pf(x) when implementing the second calibration method of the present invention. Assume now that K=4, I=32. After steps 702 and 704 are executed, the 4 test DAC control values D(1)~D(4), and the 4 test output powers PHY(1)~PHY(4) measured by the wireless signal measuring device 502 ) is to determine the main output power function P'(x), as shown in Figure 8A. When step 706 is executed, the host computer 504 calculates 32 corrected DAC control values CD(1)~ CD ( 32 ), as shown in FIG. 8B , wherein FIG. 8B only shows 6 sets of rated output power values and DAC control values after correction.

After executing the fine-tuning step in step 712, the host 504 obtains fine-tuning according to the j-th corrected DAC control value CD(j), the j-th output power PW(j) and the j-th output power rated value N(j). Output power function Pf'(x). Then, the host 504 obtains the jth fine-tuned DAC control value FD(j) according to the jth output power rating N(j) by fine-tuning the output power function Pf'(x). The jth fine-tuned DAC control value FD(j) and other calibrated DAC control values will be stored in the DAC control value register 306 of the mobile phone to complete the calibration. The calibrated mobile phone can accurately emit the output power of each power control level in accordance with the communication protocol.

Please refer to FIG. 9 , which is a schematic diagram of a production line 900 for radio frequency calibration according to the present invention. The production and calibration process using the calibration method and calibration system of the present invention are as follows. First, in the circuit board component configuration station 902, the main components of the mobile phone are fixed on the circuit board. Then, in the RF calibration and RF repair fine-tuning station 904 , the calibration system 500 of the present invention executes the first calibration method or the second calibration method to calibrate the mobile phone 506 . If the calibration fails, the mobile phone 506 is a defective product; if the calibration is successful, the mobile phone 906 is sent to the RF final test station 106 for an overall test on the entire mobile phone 506 .

The present invention can complete the calibration and fine-tuning actions in the RF calibration and RF repair fine-tuning station 904, and does not need to let the circuit board leave the production line for repair and fine-tuning as in the traditional method shown in FIG. 1 . Moreover, since the present invention can obtain all corrected DAC control values and fine-tuned DAC control values only by measuring several test output powers, the present invention has the advantage of quickly completing the calibration. After the present invention is applied to the production line, the actual application results show that because the accuracy of the calibrated DAC control value stored in the DAC control value register 306 is improved, the product yield rate is also greatly improved.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person familiar with the art can make various changes without departing from the spirit and scope of the present invention. Modifications and replacements, so the protection scope of the present invention shall prevail as defined by the appended claims.

Claims (9)

1. a correction has the method from the mobile phone of energy controlled function, proofread and correct in order to I power output I the pairing antenna of power level control number of a mobile phone, I is a positive integer, this mobile phone stores has I digital-to-analogue conversion (DAC) controlling value, this I DAC controlling value is in order to determining this I power output, and this bearing calibration comprises:

(a) the DAC controlling value is used in optional K test, and measures this K K of testing with pairing this mobile phone of DAC value and test that to use power output, K be the positive integer less than I;

(b) main frame is tested with power output PHY (1) ~ PHY (K) with this K with DAC value D (1) ~ D (K) according to this K test, thereby determines all coefficients of a main output power function to draw this main output power function P (x); (c) according to this main output power function P (x), obtain I the correction back DAC controlling value that I power output rated value answered, wherein, this I power output rated value is the regulation that meets a communication specification; And

(d) proofread and correct back DAC controlling value with this I and replace this I DAC controlling value, be stored in this mobile phone.

2. the method for claim 1 is characterized in that this main output power function is to be a polynomial function, and it can be expressed as: P (x)=a _r* x ^r+ a _R-1* x ^R-1+ ... + a ₁* x+a ₀, wherein, x represents the DAC controlling value, and r is a positive integer.By making x equal D (1) ~ D (K) respectively, and P (x) equals PHY (1) ~ PHY (K) respectively, can obtain the coefficient a of polynomial function _r~ a ₀

3. the method for claim 1 is characterized in that this K test is to be selected from this I DAC controlling value with the DAC controlling value.

4. the method for claim 1 is characterized in that also comprising the following steps: between this step (c) and this step (d)

(c1) checking DAC controlling value after this mobile phone reads this I correction respectively, so that this antenna is when sending a wireless signal, whether the power output of this wireless signal conforms to this I power output rated value respectively, if, execution in step (d) then.

5. method as claimed in claim 4 is characterized in that also comprising afterwards in this step (c1):

(c2) proofread and correct the pairing j of back DAC controlling value CD (j) power output PW (j) and a j power output rated value N (j) when not conforming to when a j, execution in step (c3), wherein, j correction back DAC controlling value is one of this I correction back DAC controlling value; And

(c3) proofread and correct back DAC controlling value, this j power output and this j power output rated value according to this j, even x=CD (j), Pf (x)=PW (j), and use j power output rated value N (j) to try to achieve the coefficient of an output power fine-adjusting function Pf (x) and determine this output power fine-adjusting function Pf (x); And

(c4), obtain a j fine setting back DAC controlling value according to j power output rated value by this output power fine-adjusting function;

And in this step (d), this j fine setting back DAC controlling value is to replace this j to proofread and correct back DAC controlling value, is stored in this mobile phone.

6. method as claimed in claim 4 is characterized in that also comprising afterwards in this step (c1):

(c2) in the time will making a j to proofread and correct a DAC controlling value pairing j power output in back more accurately near a j power output rated value, execution in step (c3), wherein, j is proofreaied and correct back DAC controlling value is one of this I correction back DAC controlling value; And

(c3) proofread and correct back DAC controlling value, this j power output and this j power output rated value according to this j, even x=CD (j), Pf (x)=PW (j), and use j power output rated value N (j) to try to achieve the coefficient of an output power fine-adjusting function Pf (x) and determine this output power fine-adjusting function Pf (x); And

(c4), obtain a j fine setting back DAC controlling value according to j power output rated value by this output power fine-adjusting function;

And in this step (d), this j fine setting back DAC controlling value is to replace this j to proofread and correct back DAC controlling value, is stored in this mobile phone.

7. a correction has the corrective system from the mobile phone of energy controlled function, proofread and correct in order to I power output I the pairing antenna of power level control number of a mobile phone, I is a positive integer, this mobile phone stores has I digital-to-analogue conversion (DAC) controlling value, this I DAC controlling value is in order to determining this I power output, and this corrective system comprises:

One wireless signal measuring equipment is in order to measure the power output that this mobile phone is launched; And

One main frame has RF correction software system, in order to proofreading and correct this mobile phone, and with this wireless signal measuring equipment electric property coupling to receive measurement from the wireless signal measuring equipment; Wherein, carrying out described RF correction software system comprises:

(a) optional K the test DAC controlling value of this main frame, this wireless signal measuring equipment measures this K K of testing with pairing this mobile phone of DAC value and tests that to use power output, K be the positive integer less than I then;

(b) this main frame according to this K test with DAC value D (1) ~ D (K) and this K test usefulness power output PHY (1) ~ PHY (K, thus determine all coefficients of a main output power function to draw this main output power function P (x); (c) this main frame obtains I the correction back DAC controlling value that I power output rated value answered according to this main output power function P (x), and wherein, this I power output rated value is the regulation that meets a communication specification; And

(d) the DAC controlling value replaced this I DAC controlling value after this main frame was proofreaied and correct this I, was stored in this mobile phone.

8. corrective system as claimed in claim 7 is characterized in that this main output power function is to be a polynomial function, and it can be expressed as: P (x)=a _r* x ^r+ a _R-1* x ^R-1+ ... + a ₁* x+a ₀, wherein, x represents the DAC controlling value, and r is a positive integer.By making x equal D (1) ~ D (K) respectively, and P (x) equals PHY (1) ~ PHY (K) respectively, can obtain the coefficient a of polynomial function _r~ a ₀

9. corrective system as claimed in claim 7 is characterized in that this K test is to be selected from this I DAC controlling value with the DAC controlling value.

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