Precision (n.pi.)/2 latching phase detector

Details Precision (n.pi.)/2 latching phase detector Precision (n.pi.)/2 latching phase detector

1995-02-22

1997-11-25

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 12, G01R 2500

Patent

active

056916566

ABSTRACT:
The present invention discloses a novel latching phase detector which eliminates prior art errors in phase detection due to DC and low frequency offsets present in reference and input signals. The invention also eliminates prior art errors in phase detection due to timing skews caused by unequal reference and input signal delay paths. The invention further eliminates the effects of logic element metastability. The invention comprises a reference signal differentiator and an input signal differentiator. Each differentiator has a corner frequency that is easily adjusted to block DC and low frequency offsets. The corner frequency can be adjusted to result in an n.pi./2 phase detector where 1.ltoreq.n.ltoreq.4. The invention also comprises an output latch that presents a delay path to the reference signal that is equal to the delay path presented to the input signal. The combined delay path experienced by the reference signal through the reference signal differentiator and the output latch is equal to the combined delay path experienced by the input signal through the input signal differentiator and the output latch. The output latch is also "race-free" and cannot enter a metastable condition.

REFERENCES:
patent: 5196804 (1993-03-01), Oetzmann

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