Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1997-05-02
1998-06-09
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327278, H03H 1126
Patent
active
057640939
ABSTRACT:
A fine variable delay circuit includes a buffer having an input connected to a signal input terminal and an output. The buffer has an output impedance and outputs a logical level from the output. The fine variable delay circuit also includes a schmidt trigger buffer having an input connected to the output of the buffer and an output connected to a signal output terminal, a CMOS transistor having a gate and two electrodes, the gate being connected to a connection point between said buffer and said schmidt trigger buffer. In addition, the fine variable delay circuit includes a first switching element connected between one of the electrodes of the CMOS transistor and one terminal of a power supply, a second switching element connected between another of the electrodes of the CMOS transistor and another terminal of the power supply, and a delay setting circuit responsive to a select signal for controlling the first switching element and the second switching element to set simultaneously each of the first switching element and the second switching element to one of an ON and an OFF state, thereby setting a delay.
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Wakerly, Digital Design Principles & Practices 1990 Prentice-Hall, Inc., Englewood Cliffs.
Hayashi Yokichi
Ochiai Katsumi
Tsukahara Hiroshi
Watanabe Naoyoshi
Yamada Masuhiro
Advantest Corporation
Callahan Timothy P.
Zweizig Jeffrey
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