The digital frequency shift demodulator circuit (CA3020, MC723 and MC724)

Published:2011/6/16 21:39:00 Author:qqtang | Keyword: frequency shift demodulator | From:SeekIC

In the figure is the digital frequency shift demodulator circuit. This circuit can be used in frequencies from 1kHz to 10kHz, and it can demodulate the frequency drifting of 1%. The input stage of the circuit consists of the wide band amplifier CA3020, whose differential output is added on the input terminal of J-K trigger. The gate circuit MC724 forms a single stable multi-resonance oscillator. The timing period of the oscillator is equal to the half period of the central frequency. The input signal passes the trigger after being lagged by the oscillator. For example, the 2920Hz means the symbol, the 2750Hz means blank space.



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