Power amplifier circuit

A power amplification circuit and amplifier technology, which is applied in the direction of power amplifiers, amplifier protection circuit layout, amplifiers, etc., can solve the problems of insufficient response speed and increased circuit size, and achieve the effect of suppressing breakdown
CN112217481APending Publication Date: 2021-01-12MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
MURATA MFG CO LTD
Publication Date
2021-01-12

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Abstract

The invention provides a power amplifier circuit which suppresses the breakdown of an amplifier due to an excessive voltage. The power amplifier circuit (10) is provided with an amplifier (201) that amplifies an input signal (RFin) and outputs an amplified signal (RF1); an amplifier (202) that is provided at the post-stage of the amplifier (201), amplifies the amplified signal (RF1), and outputs an amplified signal (RF2); and a clamping circuit (300) that is provided between the signal line (203) between the amplifier (201) and the amplifier (202) and the ground, and suppresses the amplitude of the amplified signal (RF1).
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Description

technical field

[0001] The invention relates to a power amplifier circuit. Background technique

[0002] In communication using a radio frequency (Radio Frequency: RF, radio frequency) signal of a mobile body such as a mobile phone, a power amplifier circuit is used to amplify the RF signal. Patent Document 1 discloses a semiconductor device provided with a protection circuit for preventing breakdown of the amplifier when an excessive voltage exceeding the allowable voltage is applied to the amplifier of the power amplifier circuit. By providing the protection circuit, it is possible to protect the circuit when an excessive voltage is applied from outside the power amplifier circuit.

[0003] prior art literature

[0004] patent documents

[0005] Patent Document 1: Japanese Patent Laid-Open No. 2018-142688

[0006] In a power amplifier circuit, when multi-stage transistors are used for amplification, a higher voltage is applied to the amplifier in the subsequent stage t...

Claims

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