Integrating circuit internally included in semiconductor device

Details Integrating circuit internally included in semiconductor device Integrating circuit internally included in semiconductor device

1998-01-30

1999-08-17

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By shape

327 77, G01R 2902

Patent

active

059399023

ABSTRACT:
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.

REFERENCES:
patent: 5491421 (1996-02-01), Katsuie
patent: 5519352 (1996-05-01), Mo
patent: 5581206 (1996-12-01), Chevallier et al.
patent: 5596291 (1997-01-01), Runas
patent: 5625305 (1997-04-01), Hwang
patent: 5744984 (1998-04-01), Drapac et al.
patent: 5748023 (1998-05-01), Hassner et al.
patent: 5864219 (1999-01-01), Fink

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