Duty cycle regulator

H - Electricity – 03 – K

Patent

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Details

H03K 3/017 (2006.01) H03K 3/033 (2006.01) H03K 5/151 (2006.01) H03K 5/156 (2006.01)

Patent

CA 2250538

A duty cycle regulator derives from an input clock of arbitrary duty cycle an output clock having an adjustable duty cycle of similar frequency. The invention comprises a bistable circuit for receiving an input clock pulse and providing the output clock, coupled through a feedback loop to an adjustable delay unit having a delay interval equal to an adjustable fraction of the input clock period. When an input clock pulse is received, the bistable circuit is set giving high signal to the delay unit, which after said delay interval resets the bistable circuit to give a low signal. The delay unit includes two charge pumps alternately feeding and draining electric charges into and from a low-pass filter. The delay interval can be adjusted to a desired duty cycle independent of the input clock frequency, by setting the ratio of electric currents through the two charge pumps.

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