LOW NOISE AMPLIFIER AND CONTROL METHOD OF AMPLIFIER CIRCUIT

To provide a low noise amplifier and a control method of an amplifier circuit capable of detecting faults.SOLUTION: An amplifier circuit includes an amplification transistor that amplifies a signal input from an input terminal and outputs it to a first node, a current mirror circuit that supplies a...

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Bibliographic Details
Main Author YOSHIOKA TORU
Format Patent
LanguageEnglish
Japanese
Published 13.10.2023
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Summary:To provide a low noise amplifier and a control method of an amplifier circuit capable of detecting faults.SOLUTION: An amplifier circuit includes an amplification transistor that amplifies a signal input from an input terminal and outputs it to a first node, a current mirror circuit that supplies a bias current to the amplification transistor, a resistor provided in a feedback path that returns the output of the first node to the input terminal, and a first switch provided in the feedback path to make the feedback path conductive or non-conductive, and a low noise amplifier uses the first switch to make the feedback path non-conductive when detecting a failure in the amplifier transistor.SELECTED DRAWING: Figure 5 【課題】故障を検出することができる低雑音増幅器及び増幅回路の制御方法を提供する。【解決手段】入力端子から入力される信号を増幅し、第１のノードに出力する増幅トランジスタと、増幅トランジスタにバイアス電流を供給するカレントミラー回路と、第１のノードの出力を入力端子に帰還させる帰還経路に設けられた抵抗器と、帰還経路に設けられ帰還経路を導通又は非導通にする第１のスイッチと、を有する増幅回路を備え、増幅トランジスタの故障検出を行う場合に、第１のスイッチにより帰還経路を非導通にする低雑音増幅器とする。【選択図】図５
Bibliography:Application Number: JP20220057745