High speed BiCMOS logic circuit

Details High speed BiCMOS logic circuit High speed BiCMOS logic circuit

1991-05-23

1992-11-17

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307450, H03K 1704, H03K 1901

Patent

active

051646170

ABSTRACT:
A signal applied through a signal input terminal is logically processed by a logic circuit such as a CMOS inverter and the processed signal is supplied from the signal output terminal. A pinch resistor has a resistance value controlled in accordance with a variation of a voltage at the signal output terminal. Specifically, the pinch resistor has a higher resistance value at an initial stage in the switching operation in which an output from the logic circuit lowers from a logical high level to a logical low level, and supplies a large base current to a bipolar transistor. At a later stage in the switching operation, the pinch resistor has a small resistance value, so that a residual charge in the signal output terminal and a base charge in the bipolar transistor are rapidly emitted through the pinch resistor. Thus, the resistance value of the pinch resistor is always maintained at an optimum value, which increases a speed of the switching operation of the logic circuit.

REFERENCES:
patent: 4661723 (1987-04-01), Masuda et al.
patent: 4719373 (1988-01-01), Masuda et al.
patent: 4829201 (1989-05-01), Masuda et al.
patent: 4890018 (1989-12-01), Fukushi et al.
patent: 4999523 (1991-03-01), Cham et al.
patent: 5001365 (1991-03-01), Murabayashi et al.

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