Digital phase/frequency locked loop

Details Digital phase/frequency locked loop Digital phase/frequency locked loop

H - Electricity

03

L

328/28, 331/35

H03L 7/08 (2006.01) H03L 7/089 (2006.01)

Patent

CA 1153795

DIGITAL PHASE/FREQUENCY LOCKED LOOP ABSTRACT OF THE DISCLOSURE A digital extended linear phase range phase-frequency detector is applied in a phase locked loop to provide a low noise frequency spectrum output and a fast acquisition time. This phase-frequency detector comprises a differential latch, an up/down counter and a digital to analog (D/A) converter. The D/A converter may be a resistor network type or a digital frequency rate multiplier. The loop provides a large pull-in range and locking range. The initial acquisition can be further aided by external logic or processor control. If phase error is not considered, the circuit can be arranged as a frequency locked loop. An input frequency to be tracked is applied to the count-up input of the counter. The D/A converter receives the counter's parallel output and provides an analog signal representative of the counter value. The analog signal is filtered and applied to a voltage controlled oscillator, the output of which is applied to the count-down input of the counter.

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