Power amplifier and radio frequency chip

A power amplifier and emitter technology, applied in power amplifiers, amplifier types, high-frequency amplifiers, etc., can solve problems such as inability to adjust, inability to achieve linear and continuous adjustment of gain, and inability to adjust gain linearly enough to achieve good results and achieve Feedback can be adjusted linearly and continuously
CN114094953AActive Publication Date: 2022-02-25LANSUS TECH INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANSUS TECH INC
Publication Date
2022-02-25

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Abstract

The invention provides a power amplifier. The power amplifier comprises a third capacitor, a first transistor, a first-stage matching circuit, a second transistor, a second-stage matching circuit, a third transistor, an output matching circuit, a first-stage series feedback network circuit bridged between a base electrode of the first transistor and the ground, and a second-stage series feedback network circuit bridged between a base electrode of the second transistor and the ground. The first-stage series feedback network circuit is used for adjusting the circuit equivalent capacitance value of the first-stage series feedback network circuit according to the first control voltage so as to adjust the gain of the first transistor. The second-stage series feedback network circuit is used for adjusting the circuit equivalent capacitance value of the second-stage series feedback network circuit according to the second control voltage so as to adjust the gain of the second transistor. The invention also provides a radio frequency chip. By the adoption of the technical scheme, the gain of the power amplifier can be linearly and continuously adjusted, and the effect of restraining low frequency and high frequency outside the working frequency band is good.
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Description

technical field

[0001] The invention relates to the field of amplifier circuits, in particular to a power amplifier and a radio frequency chip. Background technique

[0002] At present, in the wireless transceiver system, the radio frequency power amplifier is one of the important components. The power amplifier amplifies the power of the signal. After obtaining sufficient radio frequency power, the signal can be fed to the antenna for radiation. Among them, the gain of the power amplifier is an important performance index.

[0003] A power amplifier in the related art includes a DC blocking capacitor, a first transistor, a first-stage matching circuit, a second transistor, a second-stage matching circuit, a third transistor, and an output matching circuit connected in sequence. Among them, such as figure 1 The power amplifier shown is a commonly used power amplifier in the related art. The power amplifier is a typical three-stage power amplifier. Wherein, the power ampl...

Claims

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