Invention Grant
US07218176B2 Digital phase-locked loop circuit 有权
数字锁相环电路

Digital phase-locked loop circuit
Abstract:
A digital phase-locked loop circuit includes a counter for outputting a count value corresponding to an output frequency outputted by a voltage controlled oscillator in response to a control voltage signal, a comparator for comparing the count value from the counter with a target value associated with a target frequency output and for outputting a comparison signal according to a comparison result therebetween, a digital reference value generator for outputting a digital reference value according to the comparison signal from the comparator and including a register for storing the digital reference value therein, and a digital-to-analog converter for generating the control voltage signal based on the digital reference value received from the digital reference value generator.
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