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    • 4. 发明授权
    • Analog-to-digital converter
    • 模数转换器
    • US4178585A
    • 1979-12-11
    • US935963
    • 1978-08-22
    • Katsuaki TakagiToshiro TsukadaHisashi TsuruokaMichio Hara
    • Katsuaki TakagiToshiro TsukadaHisashi TsuruokaMichio Hara
    • H03M1/54H03M1/00H03K13/20
    • H03M1/403
    • An analog-to-digital converter comprising a capacitor for storing an analog input signal, a constant current discharging circuit coupled with the capacitor for discharging the charge stored therein, a level detection circuit connected to the input terminal of the capacitor, a counter connected to the output terminal of the level detection circuit for counting the number of clock-pulses between the time of discharge start and the time when the voltage at the input terminal of the capacitor drops to a detection level of the level detection circuit, a bias voltage supply means connected in series with the capacitor for adding a bias voltage to the voltage at the input terminal of said capacitor, and a switch connected in parallel with the capacitor for short-circuiting the capacitor when the voltage at the input terminal of said capacitor drops to the detection level.
    • 一种模数转换器,包括用于存储模拟输入信号的电容器,与电容器耦合的恒流放电电路,用于对存储在其中的电荷进行放电;电平检测电路,连接到电容器的输入端;计数器,连接到 用于对放电开始时间之间的时钟脉冲数进行计数的电平检测电路的输出端与电容器的输入端的电压下降到电平检测电路的检测电平的时间之间;偏置电压源 与电容器串联连接的装置,用于向所述电容器的输入端子处的电压增加偏置电压,以及当电容器的输入端子处的电压下降到电容器时与电容器并联连接的开关,用于使电容器短路 检测水平。