Phase detector having all NPN transistors

Details Phase detector having all NPN transistors Phase detector having all NPN transistors

1990-09-17

1992-04-07

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 328133, 328155, H03K 526, G01R 2500

Patent

active

051031230

ABSTRACT:
A phase detector is implemented with NPN transistors for providing a symmetrical push-pull output current operating in response to the phase difference between the falling edge of an oscillator signal and the mid-pulse of a sync signal. A current sinking circuit is responsive to the first and second input signals for providing a first current of predetermined magnitude and for sinking a second current of predetermined magnitude from the output of the phase detector. An NPN transistor current mirror circuit has an input responsive to the first current provided by the current sinking circuit and an output for sourcing a third current into the output of the phase detector, while a voltage equalizing circuit establishes substantially equal potentials at the input and output of the current mirror for maintaining proportional input and output current thereof.

REFERENCES:
patent: 3537018 (1970-10-01), Modiano
patent: 4068184 (1978-01-01), Ahmed
patent: 4808856 (1989-02-01), Tanigawa
patent: 4870303 (1989-09-01), McGinn
patent: 4885484 (1989-12-01), Gray

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