CD4046 Ten Times 10× Frequency Multiplier Circuit
For 1Hz to 1KHz input range, we design a VCO to cover 10Hz to 10KHz, with some extra range on each end. the VCO output is divided by 10 and then compared to the input signal using the wideband phase detector. The phase-detector output goes to the loop filter and then reaches around and closes the loop by running the VCO.
In this circuit, the CD4046 is set up so that the VCO operates at 10Hz 10 10KHz. The output pin (4) is fed back to a ÷10 counter.
When the input frequency is 1/10 the output, lockup will occur.
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