Phase-locked loop with redundant reference input

Details Phase-locked loop with redundant reference input Phase-locked loop with redundant reference input

H - Electricity

03

K

328/88

H03K 9/06 (2006.01) H03L 7/00 (2006.01)

Patent

CA 1279706

Abstract of the Disclosure PHASE-LOCKED LOOP WITH REDUNDANT REFERENCE INPUT A phase-locked loop with redundant reference input signals comprises a means, receiving the loop feedback signal, each of the reference input signals and a reference select signal, for comparing each reference input signal to the loop feedback signal to generate corresponding phase correction signals. In response to the reference select signal, one of the phase correction signals is selected for supply as a loop correction signal. Phase and frequency detec- tors are included, each detector receiving a corre- sponding reference input signal and connected to receive the loop feedback signal for generating a phase correction signal indicating the phase and frequency difference between the corresponding refer- ence input signals and the output signal. Also, a selector is provided in communication with each of the detectors that selects one of the phase correction signals in response to the reference select signal as the loop correction signal. Further a phase alignment circuit is used with phase and frequency detectors to assure tracking of the correct edge of the reference signal by each unselected phase and frequency detector.

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