Modified widlar source and logic circuit using same

Details Modified widlar source and logic circuit using same Modified widlar source and logic circuit using same

1993-03-08

1994-05-03

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307446, 323312, H03K 19013, G05F 304

Patent

active

053090446

ABSTRACT:
A modified Widlar current source (74) includes a first transistor (84) having a collector providing a first terminal of the current source (74), a base, and an emitter connected through a first resistor (85) to a second terminal of the current source (74). A second transistor (82) has a collector connected to a power supply voltage terminal through a second resistor (81) and to the base of the first transistor (84), a base connected to the collector thereof, and an emitter connected to the second terminal of the current source (74) through a third resistor (83). A switching portion (80) selectively reduces a resistance between the power supply voltage terminal and the collector of the second transistor (82) in response to a control signal. Thus, current is selectively reduced, such as during a non-switching time of a logic circuit (70).

REFERENCES:
patent: 4675552 (1987-06-01), Wood
patent: 5038053 (1991-08-01), Djenguerian
patent: 5144164 (1992-09-01), Sugimoto
patent: 5160857 (1992-11-01), Barre
patent: 5179489 (1992-12-01), Mizuide
patent: 5237214 (1993-08-01), Usami

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