Push-pull power amplifier circuit, radio frequency power amplifier circuit and radio frequency front-end module

By designing a push-pull power amplifier circuit including differential amplifier transistors, LC resonant circuits, capacitors and Barrons, the problem of poor performance of push-pull power amplifier circuits in the prior art in the wide band is solved, and better working efficiency and linearity are achieved.

CN117833837BActive Publication Date: 2025-04-04RADROCK (SHENZHEN) SEMICONDUCTOR LTD
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Patent Information

Application Number
CN202211202341.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-29
Publication Date
2025-04-04
Estimated Expiration
2042-09-29

AI Technical Summary

Technical Problem

The overall performance of existing push-pull power amplifier circuits in the broadband is poor, making it difficult to ensure linearity, output power, impedance and efficiency at the same time.

Method used

A push-pull power amplifier circuit including a first differential amplifier transistor, a second differential amplifier transistor, an LC resonance circuit, a capacitor and a Barron are designed. By configuring the LC resonance circuit, capacitor and barron, adjusting the second-order harmonic impedance and fundamental impedance of the push-pull power amplifier circuit, the overall performance of the circuit in the wide band is optimized.

Benefits of technology

Without affecting the fundamental impedance, the harmonic impedance of the push-pull power amplifier circuit is optimized, making it more converged within the entire working frequency range, improving working efficiency and linearity, and optimizing overall performance.

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Abstract

The present invention discloses a push-pull power amplifier circuit, comprising a first differential amplifier transistor and a second differential amplifier transistor, a first LC resonant circuit, a second LC resonant circuit, a third capacitor, a fourth capacitor and a first balun; the output end of the first differential amplifier transistor is coupled to the first input end of the first balun through the third capacitor, the output end of the second differential amplifier transistor is coupled to the second input end of the first balun through the fourth capacitor, the first end of the first LC resonant circuit is connected to the output end of the first differential amplifier transistor, the second end of the first LC resonant circuit is connected to the ground end, the first end of the second LC resonant circuit is connected to the output end of the second differential amplifier transistor, and the second end of the second LC resonant circuit is connected to the ground end; thereby improving the working efficiency and linearity of the push-pull power amplifier circuit, and optimizing the overall performance of the push-pull power amplifier circuit in the entire working frequency band.
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