Apparatus for generating pulse width modulated waves

Details Apparatus for generating pulse width modulated waves Apparatus for generating pulse width modulated waves

H - Electricity

03

K

354/126

H03K 7/08 (2006.01) H03K 5/156 (2006.01)

Patent

CA 1083722

Abstract of the Disclosure A comparator is provided to produce a coincidence pulse when the combination of respective stages of a first counter which counts a first clock pulse coincides with the combination of respective stages of a second counter which counts a lower second clock pulse. Furthermore, there is provided a flip-flop circuit which is set when the combination of the outputs of the first counter becomes a predetermined state and reset by the coincidence pulse thereby producing a pulse width modulated wave whose pulse width varies gradually with time. Each of the first and second counters comprises a shift register including a plurality of serially connected binary memory elements which sequentially shift an input data. Each shift register includes a feedback circuit which feeds back the outputs of predetermined ones of the binary memory elements to the first stage memory element through an exclusive OR gate circuit.

295780

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