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The pulse generating circuit composed of phase-lock loop

2017-01-08 04:43  
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The pulse generating circuit composed of phase-lock loop
The output frequency of the circuit is 10Hz~999kHz, the frequency precision is 3-bit and adjustable. In the circuit, MCl4046B(1) is the phase comparator, MC14046B(1) is the voltage control oscillator. There are two types of comparators in MC14046B, if the phase clock φ2 is used, the frequency range is 1:1000, to be simple, the maximum adjustable range is 1:10 here. It uses 3-bit digital switch to control the 3 decimal counter, i.e the frequency splitting constants composed of CD40192(1), CD40192(2) and CD40192(3) which set the frequency value.