High gain zero offset linear phase detector apparatus

Details High gain zero offset linear phase detector apparatus High gain zero offset linear phase detector apparatus

1989-07-19

1990-05-15

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 328134, 328155, 307516, H03L 718

Patent

active

049261401

ABSTRACT:
A phase detector for a phase locked loop (PLL) to be employed in a wideband synthesizer generates a ramp waveform at an output. The ramp waveform has a positive slope during the reference signal; when a sample pulse is received by the circuitry, the slope of the ramp is changed to a negative slope. Hence, the output of the detector will be negative or positive depending upon the difference in phase between the reference and sample frequencies. The ramp voltage is sampled and held by a suitable circuit which provides an error signal for controlling a VCO.

REFERENCES:
patent: 4668922 (1987-05-01), Crawford et al.

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