Constant current circuit for preventing latch-up

Details Constant current circuit for preventing latch-up Constant current circuit for preventing latch-up

1996-02-09

1997-04-29

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323312, G05F 304, G05F 308, G05F 316, G05F 320

Patent

active

056252820

ABSTRACT:
The present invention provides a constant current circuit for suppressing operation of parasitic thyristor and for preventing short-circuit of IC, even if high voltage such as a thunder is applied to a power source which increases a power supply potential Vcc momentarily. A constant current circuit of the present invention comprises a first current mirror circuit having a first pair of transistors, a second current mirror circuit having a second pair of transistors, and a MOS type capacitor being connected between the collector electrodes of said first pair of transistors and being formed in a second well area of the semiconductor substrate which is adjacent to the first well area where the first and the second mirror circuits are formed thereon.

REFERENCES:
patent: 4792750 (1988-12-01), Yan
patent: 4950976 (1990-08-01), Wagoner
patent: 5223743 (1993-06-01), Nakagawara
patent: 5300765 (1994-04-01), Mizuta
patent: 5410242 (1995-04-01), Bittner
patent: 5481180 (1996-01-01), Ryat
patent: 5521544 (1996-05-01), Hatanaka

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