AMPLIFIER CIRCUIT, IMAGING APPARATUS AND CONTROL METHOD FOR AMPLIFIER CIRCUIT
To provide an amplifier circuit capable of suppressing degradation in image quality due to fluctuations in gain.SOLUTION: An amplification transistor amplifies an input signal. A cascode transistor, when a drain-source voltage between a drain and a source is higher than a predetermined voltage, supp...
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Main Authors | , |
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Format | Patent |
Language | English Japanese |
Published |
12.09.2019
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Subjects | |
Online Access | Get full text |
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Summary: | To provide an amplifier circuit capable of suppressing degradation in image quality due to fluctuations in gain.SOLUTION: An amplification transistor amplifies an input signal. A cascode transistor, when a drain-source voltage between a drain and a source is higher than a predetermined voltage, supplies a substantially constant drain current to a reference potential line of a predetermined reference potential through the amplification transistor. A control circuit, when initialization is instructed, controls the drain-source voltage to be a higher value than the predetermined voltage.SELECTED DRAWING: Figure 6
【課題】増幅回路において、ゲインの変動による画質の低下を抑制する。【解決手段】増幅トランジスタは、入力信号を増幅する。カスコードトランジスタは、ドレインおよびソースの間のドレイン−ソース間電圧が所定電圧より高い場合には略一定のドレイン電流を増幅トランジスタを介して所定の基準電位の基準電位線に供給する。また、制御回路は、初期化が指示された場合にはドレイン−ソース間電圧を所定電圧より高い値に制御する。【選択図】図6 |
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Bibliography: | Application Number: JP20180038161 |