Power source circuit

Details Power source circuit Power source circuit

1994-01-11

1995-12-12

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327 77, 327404, H03K 17687

Patent

active

054753325

ABSTRACT:
A main P-channel field effect transistor 1 exhibiting a larger current driving capacity and an auxiliary P-channel field effect transistor 8 exhibiting a smaller current driving capacity are coupled in parallel across the input terminal 2 and the output terminal 3. When a voltage is applied on the input terminal 2, the output of the comparator 7 falls to the low level L, and the auxiliary P-channel field effect transistor 8 is first turned on. Since the current driving capacity of the auxiliary P-channel field effect transistor 8 is small, the voltage at the output terminal 3 rises gradually at a limited rate. When the voltage at the output terminal 3 exceeds a predetermined level, the output of a second comparator 9 falls to the low level L, and thereby turns on the main P-channel field effect transistor 1.

REFERENCES:
patent: 3720848 (1973-03-01), Schmidt, Jr.
patent: 3723763 (1973-03-01), Udovic
patent: 4331885 (1982-05-01), Amazawa et al.
patent: 5010261 (1991-04-01), Steigerwald
patent: 5111064 (1992-05-01), Ward
patent: 5111084 (1992-05-01), Suko

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