AMPLIFIER CIRCUIT

• Main Author: MIYAJIMA TAKAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 19.03.2020
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

To provide an amplifier circuit with improved noise/distortion component reduction performance.SOLUTION: An extracted noise/distortion component is added to a main amplifier 12 itself to cancel the noise/distortion component. That is, the noise/distortion component appearing at an inverting input terminal of an inverting amplifier circuit constituting the main amplifier 12 is amplified by a sub-amplifier 14 and input to the main amplifier 12 again to cancel the noise/distortion of the main amplifier 12. The proper cancellation amount of the noise/distortion of the main amplifier 12 is configured to be set by setting the amplification degree (amplification rate) of the sub-amplifier 14.SELECTED DRAWING: Figure 1 【課題】ノイズ・歪成分低減性能を向上た増幅回路を提供する。【解決手段】取り出したノイズ・歪成分を主増幅器１２自身に加算して打ち消す構成とした。すなわち、主増幅器１２を構成する反転増幅回路の反転入力端子に現れるノイズ・歪成分を副増幅器１４で増幅し、これを再度主増幅器１２に入力することで、主増幅器１２のノイズ・歪を打ち消すようにした。主増幅器１２のノイズ・歪の適正な打ち消し量は副増幅器１４の増幅度（増幅率）の設定で行うように構成した。【選択図】図１