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    • 10. 发明授权
    • Integrating circuit internally included in semiconductor device
    • 集成电路内部包含在半导体器件中
    • US5939902A
    • 1999-08-17
    • US15985
    • 1998-01-30
    • Hiromitsu Iwata
    • Hiromitsu Iwata
    • G06G7/184G01R19/255G01R29/02
    • G01R19/255
    • An integrating circuit internally included in a semiconductor device includes a constant voltage circuit 11 for generating a predetermined constant voltage VREF, and a voltage-to-current converting circuit 12 for converting the voltage VREF into a constant current I0, which is supplied to a capacitor 15 externally connected to a connection terminal CPT. In order to detect an integral potential charged in the capacitor 15, a voltage comparator 14 having one input connected to the capacitor connection terminal CPT and the other input connected to an input terminal IN for receiving a signal VIN to be measured, inverts its output voltage when both the input voltages becomes consistent with each other. The integrating circuit also includes a switching circuit 13 having an input connected to an output terminal of the constant voltage circuit 11, an output connected to the capacitor connection terminal CPT. When this switching circuit 13 is activated in response to a control signal, the switching circuit 13 forcibly maintains a potential of the capacitor at a constant potential obtained from the constant voltage circuit. When the switching circuit 13 is deactivated in response to the control signal, the switching circuit 13 causes the capacitor to be charged from the constant potential with the constant current I0 supplied from the voltage-to-current converting circuit 12.
    • 内部包括在半导体器件中的积分电路包括用于产生预定的恒定电压VREF的恒压电路11和用于将电压VREF转换成恒定电流I0的电压 - 电流转换电路12,该电流被提供给电容器 15外部连接到连接端子CPT。 为了检测在电容器15中充入的积分电位,电压比较器14具有连接到电容器连接端子CPT的一个输入端和连接到输入端子IN的另一个输入端,用于接收待测量的信号VIN,将其输出电压 当两个输入电压彼此一致时。 积分电路还包括开关电路13,其具有连接到恒压电路11的输出端子的输入端,连接到电容器连接端子CPT的输出端。 当该开关电路13响应于控制信号被激活时,开关电路13强制地将电容器的电位保持在从恒压电路获得的恒定电位。 当开关电路13响应于控制信号被去激活时,开关电路13使得从电压 - 电流转换电路12提供的恒定电流I0从恒定电位充电电容器。