High speed output circuit having current driving capability whic

Details High speed output circuit having current driving capability whic High speed output circuit having current driving capability whic

1992-05-21

1994-01-04

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307263, 307572, H03K 301, H03K 326

Patent

active

052763560

ABSTRACT:
An output circuit comprises an output transistor, a reference oscillator, a variable frequency oscillator, and a control circuit. The reference oscillator produces a first signal of a reference frequency according to the ideal ON resistance of the output transistor. The variable frequency oscillator generates a second signal capable of varying the oscillation frequency. The phase comparator compares the phase of a first signal from the reference oscillator with that of a second signal from the variable frequency oscillator and then controls the oscillation frequency of the variable frequency oscillator so that these two phases may coincide with each other. The control circuit controls the output transistor so that the current driving capability may be kept constant according to the output of the phase comparator.

REFERENCES:
patent: 4716313 (1987-12-01), Hori et al.
patent: 4894561 (1990-01-01), Nagami
patent: 5170078 (1992-12-01), Hsueh et al.

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