Pulse signal shaper in a semiconductor integrated circuit

Details Pulse signal shaper in a semiconductor integrated circuit Pulse signal shaper in a semiconductor integrated circuit

1997-07-10

1998-09-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327175, 327176, 327264, 327278, 327284, H03K 3017

Patent

active

058120009

ABSTRACT:
A pulse signal shaper supplying a pulse signal having a stable pulse width, including an input circuit that produces a first pulse signal in response to an input signal, a delay circuit that produces a second pulse signal obtained by delaying the first pulse signal by a predetermined time, and a signal mixing circuit that is connected to the input circuit and the delay circuit. The mixing circuit combines the first pulse signal and the second pulse signal to produce a third pulse signal having a pulse width equal to or greater than a delay time provided by the delay circuit, and supplies the third pulse signal as an output signal from the pulse signal shaper. In a preferred embodiment, the input circuit includes an oscillator responsive to the input signal. When the input signal has a higher frequency than a predetermined frequency, the input signal is supplied as the first pulse signal at a frequency equal to te frequency of the input signal. When the input signal has a lower frequency than the predetermined frequency, the first pulse signal is supplied at the predetermined frequency.

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patent: 5309034 (1994-05-01), Ishibashi
patent: 5396110 (1995-03-01), Houston
patent: 5506533 (1996-04-01), Wu
patent: 5546034 (1996-08-01), Han

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