Short Pulse Waveform Generating Circuit of DG201

Published:2011/7/7 15:20:00 Author:Michel | Keyword: Short Pulse, Waveform, Generating Circuit | From:SeekIC

The picture is a short pulse waveform generating circuit composed of DG201 etc.This circuit is often used for the signal source of measuring sound system transmitting condition or electronic instrument dynamic characteristics.In the circuit,A1's gain is almost 2 and it is used to compensate forthe gain loss of analog switch DG201 and output buffer. When terminal impedance is 600 Ω, circuit's total gain is 1 and it is also used as a buffer meanwhile. The comparator A2 is used to test positive zero-crossing.It outputs short pulse from sinO° and 74HC74 data latches keeps it synchronous.The output time of the short pulse waveform is provided by outside pulse generator and it is asynchronous with sinusoidal oscillator phase .Thus,on the zero-crossing,74HHC74's Q end outputs high PWL after the short pulse inputing high PWL.It outputs via the buffer composed of VT1~VT4 when the analog switch DG201 conducts.



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