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    • 10. 发明授权
    • Semiconductor integrated circuit
    • 半导体集成电路
    • US07075469B2
    • 2006-07-11
    • US11246170
    • 2005-10-11
    • Naoki YadaYasuyuki Saito
    • Naoki YadaYasuyuki Saito
    • H03M1/78
    • H03M1/1023H03M1/46H03M1/682H03M1/765
    • A semiconductor integrated circuit including an A/D converter capable of converting an analog signal accepted through an external terminal into a digital signal. The A/D converter includes: a ladder-type resistor for generating a reference voltage; a set of first operational amplifiers, each accepts an output voltage of the ladder-type resistor; a set of first switches, each capable of short-circuiting an input terminal and an output terminal of corresponding one of the first operational amplifiers thereby to allow an offset correction of the corresponding first operational amplifier to be made; and a comparator circuit for comparing an output voltage of each of the first operational amplifiers with the analog signal. The A/D converter can reduce a current output from the ladder-type resistor and speed up charge and discharge of the sampling capacitor.
    • 一种包括能够将通过外部端子接收的模拟信号转换为数字信号的A / D转换器的半导体集成电路。 A / D转换器包括:用于产生参考电压的梯形电阻器; 一组第一运算放大器,每个接收梯形电阻器的输出电压; 一组第一开关,每个能够使第一运算放大器的相应一个输入端子和输出端子短路,从而允许相应的第一运算放大器的偏移校正; 以及用于将每个第一运算放大器的输出电压与模拟信号进行比较的比较器电路。 A / D转换器可以减少梯形电阻器的电流输出,并加快采样电容器的充电和放电。