Switching circuit with active pull-off

Details Switching circuit with active pull-off Switching circuit with active pull-off

1983-08-01

1986-06-03

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307456, 307270, 307300, H03K 19013

Patent

active

045932107

ABSTRACT:
A bipolar gate has an output transistor (Q5) that switches in response to the voltage at an emitter of a drive transistor (Q2 or Q10). An active pull-off circuit (14) discharges the base of the output transistor (Q5) when it turns off. The discharge path is provided through a pull-off transistor (Q7) whose collector is coupled to the base of the output transistor. The switching of the pull-off transistor is regulated with a control circuit containing a trigger circuit and a bias circuit. The trigger circuit is coupled between the bias circuit and a collector of the drive transistor. A "kicker" circuit formed with an input transistor (QC1) and a voltage reference (18) speeds up the switching of the drive transistor.

REFERENCES:
patent: Re27804 (1973-10-01), Treadway
patent: 3641362 (1972-02-01), Gamble
patent: 4131808 (1978-12-01), Kuo
patent: 4132906 (1979-01-01), Allen
patent: 4321490 (1982-03-01), Bechdolt
patent: 4330723 (1982-05-01), Griffith
patent: 4339675 (1982-07-01), Ramsey
patent: 4449063 (1984-05-01), Ohmichi et al.
Signetics TTL Logic Data Manual 1982, pp. 2-1 and 2-2.

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