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WO2013011903A1 - Circuit d'amplification et procédé d'amplification - Google Patents

Circuit d'amplification et procédé d'amplification Download PDF

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Publication number
WO2013011903A1
WO2013011903A1 PCT/JP2012/067760 JP2012067760W WO2013011903A1 WO 2013011903 A1 WO2013011903 A1 WO 2013011903A1 JP 2012067760 W JP2012067760 W JP 2012067760W WO 2013011903 A1 WO2013011903 A1 WO 2013011903A1
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WO
WIPO (PCT)
Prior art keywords
impedance
output signal
amplifier circuit
detection
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/067760
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English (en)
Japanese (ja)
Inventor
有秀 野田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
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Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of WO2013011903A1 publication Critical patent/WO2013011903A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves

Definitions

  • the present invention relates to an amplifier circuit and an amplification method, and more particularly to an amplifier circuit and an amplification method having a function of automatically controlling the gain of the amplifier circuit.
  • an AGC (Automatic Gain Control) amplifier circuit changes the gain of the amplifier circuit so that the amplitude of the output signal always becomes a predetermined value. That is, the AGC amplifier circuit automatically controls the gain of the amplifier circuit so that the amplitude of the output signal is always constant even when the amplitude of the input signal changes.
  • the AGC amplifier circuit constantly monitors the amplitude of the output signal. The AGC amplifier circuit feeds back the change in amplitude to the amplifier circuit, and controls the gain of the circuit so that the amplitude of the output signal is always constant.
  • a lithium niobate (LN: LiNbO 3 ) optical modulator is used in an optical transmitter used in an optical transmission system.
  • LN optical modulator when the amplitude of the electrical signal that drives the modulator changes, the output amplitude of the optical signal also changes. As a result, the communication quality of the optical transmission system may be deteriorated.
  • the above AGC amplifier circuit may be used for the drive circuit of the LN optical modulator.
  • the output signal of the drive circuit that drives the optical modulator requires an amplitude of several V to 10 Vpp.
  • FIG. 6 shows a configuration of an amplifier circuit related to the present invention.
  • the amplifier circuit 600 is used as a drive circuit for an optical device such as an LN optical modulator.
  • the amplifier circuit 600 includes an amplifier element 601, coils 602, 603, and 604, a resistor 605, a bypass capacitor 606, and a coupling capacitor 607.
  • the amplifying element 601 amplifies the input signal 608 input to the input terminal 651 and outputs it as an output signal 609 from the output terminal 652.
  • the coils 602, 603, and 604 are connected between the output terminal 652 and the power source 653.
  • the drive current flows from the power source 653 sequentially through the coils 604, 603, and 602, and then flows from the output terminal 652 to the final stage amplification unit (hereinafter referred to as “final stage”) of the amplification element 601.
  • the resistor 605 is a damping resistor having a Q dump function.
  • the coupling capacitor 607 is provided to separate the current flowing from the power source 653 to the final stage of the amplification element 601 from the output signal 609.
  • stray capacitance is generated between circuit components in an electric circuit.
  • FIG. 6 shows examples of stray capacitance generated in the amplifier circuit 601 as C1 to C7.
  • FIG. 7 shows an example of frequency characteristics of impedances of the coils 602, 603, and 604 on the amplifier circuit 600 shown in FIG.
  • the coils 602, 603, and 604 resonate due to the stray capacitances C1 to C7 indicated by broken lines in FIG. 6, and cause an impedance peak on the frequency characteristics.
  • the inductances of the coils 602, 603, and 604 are set so as to show an example of frequency characteristics indicated by solid lines in FIG. As shown in FIG. 7, the coil 602 has a high impedance in a relatively high frequency region. The coil 604 has a high impedance in a relatively low frequency region. Coil 603 has a higher impedance than coils 602 and 604 in the frequency domain between the impedance peaks of coils 602 and 604. A circuit in which these three types of coils are connected in series has a high impedance from a relatively low frequency to a high frequency region as indicated by a broken line in FIG.
  • FIG. 8 is a diagram showing a configuration of an amplifier circuit 800 having an AGC function related to the present invention.
  • the amplifier circuit 800 includes an amplifier element 801 whose gain is variable, a coil 802, a coupling capacitor 803, a detection unit 804, and a detection control circuit 805.
  • the coil 802 shown in FIG. 8 includes the coils 602 to 604, the resistor 605, and the bypass capacitor 606 shown in FIG.
  • the coil 802 is configured to have a high impedance in a wide frequency range so as not to affect the output signal 807.
  • the amplifying element 801 amplifies the input signal 806 input to the input terminal 851 and outputs it as an output signal 807 from the output terminal 852.
  • the current supplied from the power supply 853 supplies a drive current to the final stage of the amplifying element 801 through the coil 802 and the output terminal 852.
  • the coupling capacitor 803 blocks a drive current component included in the output signal 807.
  • the detection means 804 detects a part of the output signal 807 and outputs it to the detection control circuit 805.
  • the detection control circuit 805 detects the amplitude of the output signal 807 and controls the gain of the amplification element 801.
  • the detection unit 804 and the detection control circuit 805 detect the amplitude of a part of the output signal 807 in order to control the amplitude of the output signal 807 to be constant by automatic gain control.
  • the detection control circuit 805 controls the gain of the amplifying element 801 so that the amplitude of the detected signal is equal to a predetermined value. By this series of operations, the amplitude of the output signal 807 is controlled to be constant.
  • the amplitude of the output signal 807 is detected using a capacitor as the detection means 804.
  • the signal that has passed through the capacitor (detection means 804) is input to the detection control circuit 805.
  • Patent Document 1 discloses an optical signal processing apparatus that controls a variable optical attenuator based on a result of measuring a signal on a circuit connecting a semiconductor optical amplifier and a constant current source with a high frequency power monitor. It is described.
  • the optical signal processing apparatus described in Patent Document 1 has a configuration in which power induced in an electrode of a semiconductor optical amplifier is directly detected by a high-frequency power monitor via a capacitor and a bandpass filter.
  • Patent Document 2 describes an impedance matching circuit for obtaining a high-frequency signal having a large amplitude.
  • a capacitance component and a variable capacitance diode are connected in series to a connection point of inductances connected in series, and the inductance is varied by controlling the voltage applied to the variable capacitance diode. The configuration is described.
  • the amplifier circuit 800 described with reference to FIG. 8 performs automatic gain control such that the gain of the amplifier circuit is changed and the amplitude of the output signal becomes constant.
  • the amplifier circuit 800 includes a detecting unit 804 that detects a part of the output signal.
  • the detection control circuit 805 is directly connected to the output of the amplification element via the detection means 804. For this reason, the amplification circuit 800 has a problem that the characteristic of the output signal 807 is likely to be deteriorated due to the connection of the detection control circuit 805.
  • the optical signal processing device described in Patent Document 1 has a configuration in which an output of a constant current source supplies current to a semiconductor optical amplifier through one coil.
  • the high-frequency power monitor detects high-frequency power induced in the electrodes of the semiconductor optical amplifier using a capacitor and a bandpass filter from between the coil and the semiconductor optical amplifier.
  • the optical signal processing apparatus described in Patent Document 1 detects power induced in the electrodes of the semiconductor optical amplifier directly with a high frequency power monitor via a capacitor and a band pass filter.
  • the optical signal processing apparatus described in Patent Document 1 also has a problem in that the characteristics of the high-frequency power induced in the electrodes may be affected by connecting a high-frequency power monitor. That is, the optical signal processing device described in Patent Document 1 has a problem in that the output signal of the amplifier circuit is affected by connecting the detection control circuit to the output of the amplifier circuit in the amplifier circuit 800 described in FIG. It does not disclose means for solving. Further, the impedance matching circuit described in Patent Document 2 discloses a configuration in which inductance is varied using a variable capacitance diode. However, the impedance matching circuit described in Patent Document 2 solves the problem of affecting the output signal of the amplifier circuit by connecting the detection control circuit to the output of the amplifier circuit in the amplifier circuit 800 described in FIG. Means for doing this is not disclosed. [Object of the invention] An object of the present invention is to provide a technique for solving the problem of suppressing deterioration of characteristics of an output signal of an amplifier circuit.
  • the amplifier circuit of the present invention amplifies an input signal and outputs it as an output signal from an output terminal, and is connected to an amplifying means whose gain is variable and a power source for supplying current to the amplifying means.
  • the other end of the first impedance element having a value greater than or equal to the impedance of the first impedance element is connected to the output terminal, and the other end of the second impedance element having a value greater than or equal to the impedance to the direct current is connected to the output terminal.
  • the amplification method of the present invention amplifies an input signal with a predetermined gain and outputs it as an output signal.
  • One end of the input signal is connected to a power supply that supplies current for amplification, and the impedance with respect to alternating current has a value equal to or greater than the impedance with respect to direct current.
  • the other end of the first impedance element is connected to the point where the output is output, and the other end of the second impedance element whose impedance to the alternating current is greater than or equal to the impedance to the direct current is connected.
  • An output signal is detected at a certain detection point, and the gain is controlled so that the amplitude of the detected output signal becomes a predetermined value.
  • the present invention has an effect that it is possible to suppress the deterioration of the characteristics of the output signal of the amplifier circuit.
  • FIG. 2 is a diagram illustrating a configuration in which a resistor is used in place of a coupling capacitor in the amplifier circuit illustrated in FIG. 1.
  • FIG. 2 is a diagram illustrating a configuration in which a high frequency coupler is used instead of a coupling capacitor in the amplifier circuit illustrated in FIG. 1. It is a figure which shows the minimum structure of the amplifier circuit of 1st Embodiment.
  • FIG. 1 is a diagram showing a configuration of a first embodiment of an amplifier circuit according to the present invention.
  • the amplification circuit 100 includes an amplification element 101, coils 102, 103, and 104, a resistor 105, a bypass capacitor 106, coupling capacitors 107 and 108, and a detection control circuit 109.
  • the amplifying element 101 amplifies the input signal 110 input from the input terminal 151 and outputs the amplified signal as the output signal 111 from the output terminal 152.
  • the amplifying element 101 is an amplifier whose gain can be controlled from the outside.
  • the coils 102 to 104 are connected between a power source 153 that supplies a direct current and the final stage of the amplifying element 101.
  • the resistor 105 is a damping resistor for Q dump.
  • the bypass capacitor 106 bypasses the output signal 111 that cannot be completely blocked by the coils 102, 103, and 104, prevents the power supply 153 from being affected, and eliminates noise components included in the direct current output from the power supply 153. Bypass.
  • the resistor 105 and the bypass capacitor 106 are not essential and are arranged as necessary. In the amplifier circuit 100 shown in FIG. 1, there are stray capacitances as well as the stray capacitances C1 to C7 of the amplifier circuit 600 described in FIG.
  • the coupling capacitor 107 separates the current from the power supply 153 flowing into the final stage of the amplification element 101 from the output signal 111.
  • the coupling capacitor 108 takes out the output signal 111 that appears at the connection point between the coils 103 and 104 and inputs it to the detection control circuit 109.
  • the detection control circuit 109 controls the gain of the amplifying element 101 using the output signal 111 input from the coupling capacitor 108.
  • the amplifier circuit 100 will be further described with reference to FIG.
  • FIG. 3 shows the position (hereinafter referred to as “detection point”) where the coupling capacitor 108 connected to the detection control circuit 109 detects the amplitude of the output signal 111 in the amplifier circuit 100 shown in FIG.
  • FIG. 3 The configuration of the amplifier circuit shown in FIG. 3 is obtained by omitting the coupling capacitor 108 and the detection control circuit 109 from the amplifier circuit of FIG. 1 for the sake of explanation, and the configuration other than the detection control circuit 109 is the same.
  • a detection control circuit 109 is connected through a coupling capacitor 108 to the detection point A in FIG.
  • the amplifier circuit 100 according to the first embodiment shown in FIG. 1 detects a signal corresponding to the output signal 111 via the coupling capacitor 108 at the detection point A described with reference to FIG.
  • An output signal 111 that has passed through the coil 102 and the coil 103 is input to the detection control circuit 109 via the coupling capacitor 108.
  • the detection control circuit 109 generates a detection signal corresponding to the amplitude of the output signal 111 from the signal input from the coupling capacitor 108.
  • the detection control circuit 109 stores a predetermined value corresponding to the target value of the amplitude of the output signal 111.
  • the detection control circuit 109 compares the predetermined value with the detection signal, generates a control signal for controlling the gain of the amplifier circuit 101 so that the magnitude of the detection signal approaches the predetermined value, and generates the amplification element 101. Output to. With the above operation, automatic gain control is performed in the amplifier circuit 100 so that the amplitude of the output signal 111 of the amplifier element 101 is constant.
  • FIG. 4 is a diagram showing the frequency characteristics of the impedance between the connection point (detection point A) between the coils 103 and 104 shown in FIG. 3 and the output terminal 152 of the amplification element 101.
  • the coils 102 to 104 resonate due to stray capacitance and have a peak on the frequency characteristic of impedance.
  • the coil 102 has a high impedance in a relatively high frequency region.
  • the coil 104 has a high impedance in a relatively low frequency region.
  • the coil 103 has a high impedance at a frequency between the impedance peaks of the coil 102 and the coil 104.
  • the detection point A where the detection control circuit 109 detects the output signal 111 is between the coil 103 and the coil 104.
  • the impedance between the output terminal 152 and the detection point A is high in a medium to relatively high frequency region.
  • the amplifier circuit 100 according to the first embodiment can reduce the influence on the output signal 111 due to the connection of the detection control circuit 109. That is, the amplifier circuit 100 according to the first embodiment has an effect that it is possible to suppress the deterioration of the characteristics of the output signal of the amplifier circuit.
  • the output signal 111 in the middle to high frequency region of the output signal 111 is blocked by the coils 102 and 103. Therefore, at the connection point (detection point A) between the coil 103 and the coil 104 in FIG. 3, a frequency region component (indicated by Wa in FIG.
  • the amplifier circuit 100 of the first embodiment also has an effect that the influence on the operation of the detection control circuit 109 due to the high frequency characteristics of the coupling capacitor 108 and the stray capacitance of the circuit can be reduced. Note that the coils 102 and 103 in FIG.
  • the amplifier circuit 100 has a configuration in which a coil other than the coils 102 and 103 is connected between the coupling capacitor 108 and the output terminal 152 to prevent the output signal 111 from passing through the high-frequency signal. There is also an effect that the scale of the amplifier circuit can be reduced.
  • the detection control circuit 109 detects the output signal 111 from between the coil 103 and the coil 104 through the coupling capacitor 108.
  • a modified example using a resistor or a high-frequency coupler instead of the coupling capacitor 108 will be described with reference to FIGS.
  • FIG. 9 is a diagram illustrating a configuration in which a resistor 901 is used instead of the coupling capacitor 108 in the amplifier circuit 100 illustrated in FIG.
  • the detection control circuit 109 detects the output signal 111 from between the coil 103 and the coil 104 through the resistor 901. By increasing the resistance value of the resistor 901, the resistance R viewed from the output of the amplifying element 101 becomes high impedance, and the influence due to the detection control circuit 109 being connected is reduced.
  • FIG. 10 is a diagram illustrating a configuration in which the high frequency coupler 902 is used in place of the coupling capacitor 108 in the amplifier circuit 100 illustrated in FIG.
  • the detection control circuit 109 detects the output signal 111 from between the coil 103 and the coil 104 through the high frequency coupler 902.
  • the high frequency coupler 902 picks up a part of the output signal 111 by spatial coupling without directly connecting the wiring to the detection control circuit 109 between the coil 103 and the coil 104.
  • the high-frequency coupler 902 having an appropriate high-frequency impedance, the influence on the amplifier circuit due to the connection of the detection control circuit 109 can be reduced as in the amplifier circuit described in FIGS. it can. Note that the amplifier circuit of the first embodiment has the same effect even with the following minimum configuration.
  • the amplifier circuit 300 shown in FIG. 11 includes an amplifying unit 301, a first impedance element 302, a second impedance element 303, a detecting unit 304, and a control unit 305.
  • the amplifying means is an amplifying means that amplifies the input signal 306 and outputs it as an output signal 307 from the output terminal 308, and the gain is variable.
  • the amplifying means 301 corresponds to the amplifying element 101 in FIG.
  • the first impedance element 302 corresponds to the coil 104 in FIG. 1
  • the second impedance element 303 corresponds to the coils 102 and 103.
  • the detection unit 304 corresponds to the coupling capacitor 108
  • the control unit 305 corresponds to the detection control circuit 109.
  • the impedance with respect to the alternating current of the first and second impedance elements 302 and 303 has a value equal to or greater than the impedance with respect to the direct current.
  • One end of the first impedance element 302 is connected to a power supply 309 that supplies current to the amplification means 301
  • one end of the second impedance element 303 is connected to an output terminal 308 of the amplification means 301.
  • the other ends of the first and second impedance elements 302 and 303 are connected at a detection point. This detection point corresponds to detection point A in FIG.
  • the detection means 304 detects the output of the output signal 307 at the detection point. Then, the control unit 305 controls the gain of the amplification unit 301 so that the amplitude of the detected output signal 307 becomes a predetermined value.
  • the amplifier circuit 300 having such a configuration includes a first impedance element 302 between the power source 309 and the detection point, the impedance with respect to alternating current having a value equal to or greater than the impedance with respect to direct current.
  • a second impedance element 303 is provided between the output terminal 308 of the amplifying element 301 and the detection point.
  • the amplifier circuit 300 having the minimum configuration can also supply a direct current from the power source 309 to the amplifier unit 301 and suppress the influence on the output signal by connecting the control unit 305 to the detection point. There is an effect that can be done.
  • the impedance elements 302 and 303 are not limited to coils (that is, inductance elements having inductive reactance). For example, resistors may be used as the impedance elements 302 and 303.
  • FIG. 2 is a diagram showing the configuration of the second embodiment of the amplifier circuit of the present invention.
  • the amplifier circuit 200 of the second embodiment is the same as that shown in FIG.
  • FIG. 5 shows the impedance frequency characteristics of the coils 102 to 104 shown in FIG.
  • the impedance between the connection point (detection point B) and the output terminal 152 of the amplifying element 101 As shown in FIG. 2, only the coil 102 exists between the detection point B and the output terminal 152 of the amplification element 101. As a result, the output signal 111 appearing at the detection point B is affected by the impedance of only the coil 102 and is not affected by the impedance of the coils 103 and 104. Therefore, as shown in FIG. 5, the impedance between the output terminal 152 and the detection point B is high in a high frequency region. As a result, in the amplifier circuit 200 of the second embodiment, the influence when the detection control circuit 109 is connected to the detection point B on the high frequency region component of the output signal 111 is reduced.
  • a signal having a frequency component (indicated by Wb in FIG. 5) from a relatively low frequency to a frequency slightly lower than the impedance peak of the coil 102 appears in the output signal 111.
  • Wb the frequency component
  • the detection point B where the detection control circuit 109 detects the output signal 111 is between the coil 102 and the coil 103.
  • the frequency region where the impedance between the detection point B and the output terminal 152 is high is on the higher frequency side than FIG.
  • the amplifier circuit 200 of the second embodiment has a high impedance between the detection point B and the output terminal 152 in a relatively high frequency region. For this reason, the amplifier circuit 200 of the second embodiment can suppress the influence on the output signal 111 in a relatively high frequency region due to the connection of the detection control circuit 109. That is, the amplifier circuit 200 of the second embodiment has an effect that it is possible to suppress the deterioration of the characteristics of the output signal of the amplifier circuit.
  • the signal detected at the detection point B is detected at the detection point B because the bandwidth of the signal detected at the detection point B is wider than the bandwidth of the signal detected at the detection point A. The amplitude of the output signal 111 increases.
  • the amplifier circuit 200 of the second embodiment improves the signal-to-noise ratio (S / N ratio) of the signal input to the detection control circuit 109 as compared to the amplifier circuit 100 of the first embodiment.
  • the influence on the gain control can be reduced. 2 prevents both the power supply 153 and the detection control circuit 109 from passing the components in the high-frequency region of the output signal 111. Therefore, the amplifier circuit 200 includes an amplifier circuit that is different from a configuration in which a coil different from the coil 102 is connected between the coupling capacitor 108 and the output terminal 152 to prevent the high-frequency signal of the output signal 111 from passing.
  • the scale can be reduced.
  • the configuration of the second embodiment is different from the configuration of the first embodiment only in that the position of the detection point is from detection point A to detection point B. Therefore, the configuration using the resistor (FIG. 9) and the configuration using the high frequency coupler (FIG. 10) described in the first embodiment as a modified example are the amplifier circuit of the second embodiment. 200 can be similarly applied. In the first and second embodiments described above, the detection point A and the detection point B have been described as being fixedly connected. However, the amplifier circuits 100 and 200 may be configured to change the connection relationship among the detection point, the coil 102, the coil 103, and the output terminal 152 based on the output signal 111.
  • the impedance of the impedance element between the detection point and the output terminal 152 may be changed based on the output signal 111.
  • the detection control circuit 109 may switch the connection destination of the coupling capacitor 108 from the detection point A to the detection point B. As a result, the amplitude of the signal input to the detection control circuit 109 increases.
  • the detection control circuit 109 may switch the connection destination of the coupling capacitor 108 from the detection point B to the detection point A. As a result, the high frequency component of the output signal 111 input to the detection control circuit 109 is reduced, and the influence on the detection control circuit 109 due to the stray capacitance of the high frequency component can be reduced.
  • the detection control circuit 109 may switch between the detection point A and the detection point B based on the output signal 111 that has passed through the coupling capacitor 108.
  • the amplifier circuit 100 or 200 may include a monitoring unit that monitors the output signal 111, and the detection control circuit 109 may switch between the detection point A and the detection point B based on the output of the monitoring unit.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

L'invention concerne un circuit d'amplification qui, afin d'éviter la détérioration d'une caractéristique du signal de sortie du circuit d'amplification, comprend : un moyen d'amplification qui amplifie un signal d'entrée et produit le signal amplifié sur une borne de sortie comme signal de sortie et qui possède un gain variable ; et un moyen de commande qui est doté d'un moyen de détection et qui commande le gain du moyen d'amplification de sorte que l'amplitude du signal de sortie, détectée par le moyen de détection, prenne une valeur prédéterminée, ledit moyen de détection détectant l'intensité du signal de sortie au niveau d'un point de détection auquel sont connectées une extrémité d'un premier élément d'impédance et une extrémité d'un second élément d'impédance, le premier élément d'impédance ayant son autre extrémité connectée à une source de courant qui fournit du courant au moyen d'amplification et qui présente une valeur d'impédance en courant alternatif égale ou supérieure à la valeur d'impédance en courant continu et le second élément d'impédance ayant son autre extrémité connectée à la borne de sortie et ayant une valeur d'impédance en courant alternatif égale ou supérieure à la valeur d'impédance en courant continu.
PCT/JP2012/067760 2011-07-16 2012-07-05 Circuit d'amplification et procédé d'amplification Ceased WO2013011903A1 (fr)

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JP2011157257 2011-07-16
JP2011-157257 2011-07-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110768637A (zh) * 2018-07-27 2020-02-07 宏碁股份有限公司 信号增益控制方法与电子装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09284062A (ja) * 1996-04-19 1997-10-31 New Japan Radio Co Ltd 高周波電力増幅器
JP2000323945A (ja) * 1999-05-11 2000-11-24 Tuner Kk アップコンバージョン方式のａｍ受信機における高周波増幅回路
JP2001024455A (ja) * 1999-06-10 2001-01-26 Whitaker Corp:The パワートランジスタ回路

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2317517B (en) * 1996-09-20 2001-03-14 Nokia Mobile Phones Ltd Amplifier system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09284062A (ja) * 1996-04-19 1997-10-31 New Japan Radio Co Ltd 高周波電力増幅器
JP2000323945A (ja) * 1999-05-11 2000-11-24 Tuner Kk アップコンバージョン方式のａｍ受信機における高周波増幅回路
JP2001024455A (ja) * 1999-06-10 2001-01-26 Whitaker Corp:The パワートランジスタ回路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110768637A (zh) * 2018-07-27 2020-02-07 宏碁股份有限公司 信号增益控制方法与电子装置

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