Phase tracking loop circuit

Details Phase tracking loop circuit Phase tracking loop circuit

H - Electricity

03

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328/160, 350/66

H03J 7/02 (2006.01) H03D 3/02 (2006.01) H03H 7/01 (2006.01) H03J 7/08 (2006.01) H03L 7/06 (2006.01) H04N 9/24 (2006.01)

Patent

CA 1130450

S01238 S79P110 PHASE TRACKING LOOP CIRCUIT ABSTRACT OF THE DISCLOSURE A phase-tracking loop circuit which can be used, for example, as an FM detector or as a frequency-tracking control cir- cuit to control the index signal of a beam-index cathode ray tube (CRT), includes an adder receiving an input signal of fluctuating frequency, a tracking filter coupled to the output of the adder and whose passband center frequency is shiftable, in response to a control voltage, to follow changes in the frequency of the input signal, an attenuator feeding an attenuated version of the output from the tracking filter back to the adder for combining in the latter with the input, and a phase comparator comparing the phase of the output of the adder with the output of the tracking filter to provide a corresponding control voltage to the tracking filter. If used as an FM detector, the control voltage can also constitute a demodulated signal. If used to control color switch- ing in a beam index CRT, a controlled signal tracking the phase of the index signal can be derived from a phase-locked loop circuit which provides one of the inputs to the phase comparator in response to the output of the tracking filter. -i-

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