The FSK signal demodulation circuit composed of the digital phase-lock

Published:2011/6/24 2:38:00 Author:Seven | Keyword: FSK, signal demodulation, phase-lock | From:SeekIC

In Figure 7-2 is the FSK signal demodulation circuit composed of the digital phase-lock. The circuit consists of 2 oscillators with different frequencies, i.e crystal oscillators X (the frequency is 983.04KHz) and X2 (the frequency is 1.2288MHz) compose the oscillator, and X2 consists of the frequency converting circuit 74HC157, frequency splitting circuit MC14040B, phase comparator MCI4030B and so on. The output signal of the comparator MC14030B is delivered into the converting circuit 74HC157, by adjusting the ratio of frequency 1 and frequency 2, the output frequency can be any one between the two frequencies.



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