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Power amplifier circuit

A technology of power amplifier circuit and power amplifier, applied in amplifiers, amplifier types, radio frequency amplifiers, etc., can solve the problems of non-linearity, large gain, etc., and achieve the effect of suppressing distortion

Pending Publication Date: 2021-08-06
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, power amplifying circuits sometimes have a characteristic that the gain becomes larger than the above-mentioned set gain when the power supply potential is low (the amplitude of the high-frequency signal is relatively small).
Therefore, when the gain is different when the amplitude of the high-frequency signal is relatively small and when the amplitude is relatively large, the power amplifier does not operate linearly.

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach

[0048] (the whole frame)

[0049] figure 1 It is a diagram showing the configuration of a transmission circuit including the power amplifying circuit of the first embodiment. The transmission circuit 1 is used, for example, in a wireless communication terminal device such as a mobile phone device to transmit various signals such as voice and data to a base station. In addition, the wireless communication terminal device further includes a receiving unit for receiving a signal from a base station, but description thereof is omitted here.

[0050] Such as figure 1 As shown, the sending circuit 1 includes a baseband circuit 2 , an RF (radio frequency, radio frequency) circuit 3 , a power supply circuit 4 , a power amplifier circuit 5 , a front-end circuit 6 , and an antenna 7 .

[0051] The baseband circuit 2 is based on HSUPA (High Speed ​​Uplink Packet Access, high-speed uplink packet access), LTE (Long Term Evolution, long-term evolution) and other modulation methods for th...

no. 2 Embodiment approach

[0159] Figure 10 It is a diagram showing the circuit configuration of the power amplifying circuit of the second embodiment. The power amplifying circuit 5A of the second embodiment differs from the power amplifying circuit 5 of the first embodiment in that one end of the resistor Rd_c is electrically connected to one end of the inductor L1, and the other points are the same.

[0160] A power supply potential Vcc2 serving as an envelope tracking power supply potential is input to one end of the resistor Rd_c. Therefore, the operation of the adjustment circuit 15 is the same as that of the first embodiment. The adjustment circuit 15 adjusts the bias current Ib2 by outputting the current Id_e corresponding to the power supply potential Vcc2 to the base of the transistor Q2 via the resistors Rd_e and Rb2. That is, the power amplifying circuit 5A exhibits the same effect as the power amplifying circuit 5 .

[0161] In addition, the power amplifying circuit 5A can improve the d...

no. 3 Embodiment approach

[0169] Figure 11 It is a diagram showing the circuit configuration of the power amplifying circuit of the third embodiment. The power amplifying circuit 5B of the third embodiment differs from the power amplifying circuit 5 of the first embodiment in that the adjustment circuit 15B includes a capacitor C21 in addition to the circuit configuration of the adjustment circuit 15 , and the other points are the same. The capacitor C21 corresponds to the "second capacitor" in this disclosure.

[0170] One end of the capacitor C21 is electrically connected to the base of the transistor Qd. The other end of the capacitor C21 is electrically connected to the collector of the transistor Qd.

[0171] When the power supply potential Vcc1 is an envelope tracking potential that changes according to the envelope of the high-frequency input signal RFin, the change in the power supply potential Vcc1 is transferred from the other end of the resistor Rd_c (collector of the transistor Qd) to th...

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Abstract

Provided is a power amplifier circuit that suppresses distortion of a high-frequency signal. The power amplifier circuit includes a power amplifier including a first transistor having a first terminal connected to a reference potential, a second terminal to which a first current and a high-frequency signal are input, and a third terminal connected to a first power supply potential via a first inductor; a capacitor connected to the third terminal of the first transistor; a second transistor including a first terminal connected to the other end of the capacitor and the reference potential via a second inductor, a second terminal to which a second current is input and which is connected to the reference potential, and a third terminal connected to the first power supply potential via a third inductor and outputting a high-frequency signal; and an adjustment circuit that outputs a third current corresponding to the first power supply potential or a second power supply potential to the second terminal of the second transistor.

Description

technical field [0001] The invention relates to a power amplifier circuit. Background technique [0002] Patent Document 1 describes a power amplifying circuit in which the collector of the first transistor and the emitter of the second transistor are connected via a capacitor, a high-frequency input signal is input to the base of the first transistor, and the The collector of the transistor outputs a high-frequency output signal. The power amplifying circuit described in Patent Document 1 can increase the output power without increasing the power supply potential. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2018-85689 [0006] Patent Document 2: Japanese Patent Laid-Open No. 2018-195954 [0007] It is advisable for the power amplifier circuit to amplify high-frequency signals with low distortion. Therefore, it is preferable for the power amplifier circuit to have linearity, that is, it is preferable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/22
CPCH03F1/22H03F1/0227H03F1/565H03F3/195H03F3/245H03F2200/102H03F2200/451H03F2200/516H03F2200/411
Inventor 榎本纯渡边一雄田中聪田中佑介伊藤真音
Owner MURATA MFG CO LTD