Digital phase comparator

Details Digital phase comparator Digital phase comparator

H - Electricity

03

L

328/162

H03L 7/00 (2006.01) G01R 25/00 (2006.01)

Patent

CA 1069592

ABSTRACT: A high gain digital phase comparator which in digital phase lock loop systems can give a thousand- fold reduction in ripple and close-in noise sideband amplitudes. The comparator is of the sample-and-hold type but the normal ramp reference waveform is replac- ed by a waveform with a very steep rising or falling slope. This slope is sampled and its steepness gives the increased gain of the phase comparator. Additional logic and switching circuits are added to make the com- parator frequency-sensitive. - 30 -

263092

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