Measurement bandwidth enhancement in phase lock loops

Details Measurement bandwidth enhancement in phase lock loops Measurement bandwidth enhancement in phase lock loops

1974-08-15

1976-06-01

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

331 18, 325 42, G01R 2500

Patent

active

039612554

ABSTRACT:
In a phase lock loop, the bandwidth of the phase error signal, when used for phase measurement outside the loop, is increased by summing the error signal with an integrated version of the VCO control signal derived from the loop filter circuit. The combined effect on the error signal of both the loop filter circuit and the integration provides a boost effect at low frequencies, which when summed with the unprocessed error signal results in a broadband measurement signal with a low frequency cut-off below the low-frequency cut-off of the loop itself. This technique permits extending the bandwidth of the measurement signal without affecting loop operation.

REFERENCES:
patent: 3181122 (1965-04-01), Brown
patent: 3546588 (1970-12-01), Campbell
patent: 3806827 (1974-04-01), Standke

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