Programmable delay clock chopper/stretcher with fast recovery

Details Programmable delay clock chopper/stretcher with fast recovery Programmable delay clock chopper/stretcher with fast recovery

1992-01-31

1995-05-30

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327172, 327124, 327392, 327277, 327294, H03K 501, H03K 513, H03K 1756, H03K 5159

Patent

active

054204674

ABSTRACT:
A pulse shaping circuit of the clock stretcher/chopper type which is sufficiently simplified to be included on an integrated circuit chip with other circuits without significantly reducing the chip area on which such other circuits may be formed achieves a fast recovery time by developing differential delays in response to each of two different characteristics of a signal input to a delay line. Pulse stretching is accomplished by a latch circuit and pulse chopping is accomplished by a delay arrangement which controls the latching action and the output signal. The delay arrangement may also be made programmable. By controlling the latching and the output signal in response to the delay line, a wide range of duty cycles of input and output signals may be accommodated, even at extremely high frequencies. By providing for asymmetric delays, preferably by an asymmetric logic gate monitoring selected stages of a multi-stage delay line, the recovery period of the circuit is made independent of the total delay of the delay line.

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