Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Regenerating or restoring rectangular or pulse waveform
Patent
1996-02-05
1999-05-25
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Regenerating or restoring rectangular or pulse waveform
327172, 327175, 327291, H03K 384
Patent
active
059072547
ABSTRACT:
The invention provides a method and system for reshaping periodic waveforms to a selected duty cycle. An incoming periodic waveform has its edge transitions stretched out, and the stretched edge transitions compared with an adaptively selected threshold, to generate a reshaped waveform with a 50% duty cycle. The incoming periodic waveform is a square wave clock signal. The edge transitions are stretched using an inverter which is biased and filtered, and the stretched edge transitions are squared off using a comparator. The reference voltage for the comparator is selected using a second filter coupled in a feedback configuration with the biasing transistors for the inverter.
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Callahan Timothy P.
Kim Jung Ho
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