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    • 6. 发明专利
    • Operational amplification circuit
    • 操作放大电路
    • JP2012147361A
    • 2012-08-02
    • JP2011005699
    • 2011-01-14
    • Olympus Corpオリンパス株式会社
    • TAKEI TATSUYA
    • H03F3/34H03F3/45
    • H03F3/45475H03F3/45192H03F3/4565H03F3/45937H03F2203/45082H03F2203/45406H03F2203/45444H03F2203/45482
    • PROBLEM TO BE SOLVED: To provide an operational amplification circuit that can more accurately control a common mode output voltage by compensating for an output offset voltage of the common-mode output voltage caused by an error in a current source or an error in mirror precision of a current mirror.SOLUTION: After a common-mode detection circuit 11 detects a common-mode output voltage of a fully-differential amplification circuit 10 when an input switching circuit 14 selects a common mode reference voltage and outputs it as a common-mode base voltage, an S/H circuit 12 samples and holds the output of the common-mode detection circuit 11; an operation circuit 13 outputs a voltage based on the difference between the output of the S/H circuit 12 and the common-mode reference voltage, and on the common-mode reference voltage; and the input switching circuit 14 selects the output of the operation circuit 13 to output it as the common-mode base voltage.
    • 要解决的问题:提供一种运算放大电路,其可以通过补偿由于电流源中的误差引起的共模输出电压的输出偏移电压或误差来更精确地控制共模输出电压 电流镜的镜面精度。 解决方案:当输入开关电路14选择共模参考电压并且将其作为共模基极电压输出时,共模检测电路11检测到全差分放大电路10的共模输出电压 S / H电路12采样并保持共模检测电路11的输出; 运算电路13基于S / H电路12的输出与共模参考电压之间的差以及共模参考电压输出电压; 输入切换电路14选择运算电路13的输出,作为共模基极电压输出。 版权所有(C)2012,JPO&INPIT