High speed push-pull driver having current mirror pull-down

Details High speed push-pull driver having current mirror pull-down High speed push-pull driver having current mirror pull-down

1990-01-24

1991-04-30

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307455, 307456, 307491, 307362, 307310, 330257, 330288, H03K 301, H03K 19086

Patent

active

050121286

ABSTRACT:
A push-pull driver circuit is disclosed comprising two stages. The first stage includes a current switch producing a dual phase output. The second stage includes a first emitter follower for output pull-up and a second emitter follower and a current mirror for output pull-down. The inputs of the first and second emitter followers are connected to respective output phases of the first stage. The outputs of the emitter followers are connected to respective terminals of the current mirror. The output of the second emitter follower also is connected to the output line being driven. A fixed biasing source maintains the current mirror transistors in conductive states at all times. Schottky diodes are connected to the current mirror transistors to prevent saturation.

REFERENCES:
patent: 4276485 (1981-06-01), Rydval
patent: 4490630 (1984-12-01), Freeman
patent: 4539493 (1985-09-01), Varadarajan
patent: 4559458 (1985-12-01), Ma
patent: 4626709 (1986-12-01), Maxumder et al.
patent: 4636665 (1987-01-01), McLaughlin
patent: 4906869 (1990-03-01), Masuoka
IBM Technical Disclosure Bulletin, vol. 24, No. 1B, Jun. 1981, p. 511--Emitter Coupled Logic Gate with a Dual Current Source, H. Beranger et al.
IBM Technical Disclosure Bulletin-vol. 19, No. 12, May 1977, pp. 4614-4615, Complementary Driver for Emitter-Coupled-Logic Gates by A. W. Chang et al.
IBM Technical Disclosure Bulletin, vol. 25, No. 10, Mar. 1983, Array Word/Bit Line Driver by F. J. Crispi et al.

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