Self-biased feedback-controlled active pull-down signal switchin

Details Self-biased feedback-controlled active pull-down signal switchin Self-biased feedback-controlled active pull-down signal switchin

1992-04-27

1994-08-30

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307563, 307300, H03K 1716, H03K 508

Patent

active

053430921

ABSTRACT:
High speed, low power signal switching logic implementable in bipolar or BiCMOS technology is described. Signal switching is between a first prescribed state and a second prescribed state and is accomplished using a conventional active signal pull-up circuit in combination with a novel self-biased, feedback-controlled active signal pull-down circuit. The active signal pull-down circuit is driven by a feedback signal obtained from the active pull-up circuitry such that only a single input connection to the signal switching circuit is required. Preferably, the active signal pull-up circuit comprises an emitter follower coupled transistor and the drive signal for the active signal pull-down circuit is taken from the collector thereof via a dc-coupling level shifter. Various signal switching circuit embodiments are described.

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