Output voltage driver with transient active pull-down

Details Output voltage driver with transient active pull-down Output voltage driver with transient active pull-down

1983-12-22

1986-03-18

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307270, 307299A, 307255, H03K 1540, H03K 1936

Patent

active

045771251

ABSTRACT:
An output voltage driver apparatus for an ECL circuit driving a capacitive load is disclosed which comprises an emitter follower means having an output emitter and a reference emitter. The output emitter is connected to the capacitive load. A pull-down transistor means is connected to the output emitter and provides a transient pull-down current for a capacitive load when the output voltage swings from a high level to a low level. A biasing means is connected between the reference emitter of the emitter follower means and the pull-down transistor means so that the pull-down transistor means is biased to turn on when the voltage at the output emitter is higher than the voltage at the reference emitter by a turn-on voltage. Because the capacitive load will hold the voltage of the output emitter higher than that of the reference emitter until the capacitance of the load is discharged, the pull-down transistor means provides a transient pull-down current which speeds up the switching time of the emitter couple logic circuit.

REFERENCES:
patent: 3050641 (1962-08-01), Walsh
patent: 4081695 (1978-03-01), Allen et al.
patent: 4194131 (1980-03-01), Mrazek et al.
patent: 4287435 (1981-09-01), Cavaliere et al.
patent: 4289978 (1981-09-01), Konian et al.

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