Input protection circuit for a CMOS comparator

Details Input protection circuit for a CMOS comparator Input protection circuit for a CMOS comparator

1994-08-24

1995-11-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

330 51, 330252, 330253, H03F 304

Patent

active

054711754

ABSTRACT:
An improved input protection circuit receiving a differential signal has a small signal input circuit and a large signal input circuit. The small signal input circuit is active when the differential input signal has a magnitude not exceeding a predetermined value. The large signal input circuit is active when the differential input signal has a magnitude exceeding the predetermined value. Because the small signal input circuit does not see a large differential signal across the gate terminals of its input transistors, offset voltage ("V.sub.os ") drift is avoided resulting in enhanced circuit reliability. A switch circuit isolates the small signal input circuit when the large signal input circuit is active.

REFERENCES:
patent: 4236120 (1980-11-01), White
patent: 4636744 (1987-01-01), King et al.
patent: 5101170 (1992-03-01), Torazzina et al.
patent: 5153529 (1992-10-01), Koda et al.
patent: 5193821 (1993-03-01), Brambilla et al.
Article entitled "Channel Length and Width Effects on NMOS Transistor Degradation Under Constant Positive Gate-Voltage Stressing" by Ken Wu, Sam Pan, David Chin, and J. Shaw, Intel Corporation, IDEM 91, IEEE 1991, pp. 735-738.

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