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The PLL synthesized oscillator circuit diagram

2016-08-17 23:59  
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The PLL synthesized oscillator circuit diagram
PLL synthesizer oscillator circuit is a feedback loop composed of reference oscillator, phase comparator, loop filter, voltage controlled oscillator, programmable frequency divider and other components. In the circuit, the reference oscillator uses a crystal oscillator (OSC) to output 1MHz or l00kHz 1/1000 or 1/100 divider and generate 1kHz signal, then it is compared with the output of 1 / N sub- frequency circuit. 4046 contains PC1 and PC2 two-phase comparators which can obtain the output corresponding to phase difference or frequency.