CN110603732A - 运算放大器及其控制方法 - Google Patents

运算放大器及其控制方法 Download PDF

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CN110603732A
CN110603732A CN201880000402.8A CN201880000402A CN110603732A CN 110603732 A CN110603732 A CN 110603732A CN 201880000402 A CN201880000402 A CN 201880000402A CN 110603732 A CN110603732 A CN 110603732A
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output
circuit
stage
voltage
amplifier
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CN110603732B (zh
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王文祺
黄思衡
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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Abstract

本申请提供了一种运算放大器，其特征在于，包括第一放大级，用来根据多个输入电压产生多个第一输出电压；第二放大级，用来根据所述多个第一输出电压，产生多个第二输出电压；第二输出级电路，用来复制与所述第一输出级电路相同或等比例缩小的电路；第一共模回馈电路，用来将所述第二输出级电路的输出共模电压，维持于一预设值；逻辑回路电路，用来于所述运算放大器于直流校正时，调整所述第一放大级的所述多个第一输出电压的差值；偏压电路，用来产生在运算放大器开启后与所述第一放大级的所述多个第一输出电压的共模电压相近的电压，以作为第二共模回馈电路的参考电压。本申请提供的运算放大器具有降低电压突波，避免产生爆音噪声的优点。

Description

PCT国内申请，说明书已公开。

Claims (11)

  1. PCT国内申请，权利要求书已公开。
CN201880000402.8A 2018-04-12 2018-04-12 运算放大器及其控制方法 Active CN110603732B (zh)

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GB2591523B (en) 2020-01-31 2022-03-23 Cirrus Logic Int Semiconductor Ltd Audio amplifier circuitry
CN114070213A (zh) * 2020-08-05 2022-02-18 圣邦微电子（北京）股份有限公司 运算放大器

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