WAVEFORM_SYNTHESIZER

Published:2009/7/21 1:45:00 Author:Jessie | From:SeekIC

Values of weighting resistors connected to inputs of multiplexer chips determine waveform of analog output. CD4024 binary counter sequences multiplexers through all states at 16 times fundamental frequency of desired waveform. Active filter using 741 opamp removes components of sampling frequency. For near-approximation to sine wave, weighting resistors range from about 15Kto 425K.-J. R. Tracy, CMOS Circuits Generate Arbitrary Periodic Waveforms, EDN Magazine, Aug. 20, 1973, p 86-87.



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