Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Patent
1993-12-22
1995-08-22
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
327175, 327 31, 327 36, 327 37, H03K 526
Patent
active
054444039
ABSTRACT:
A duty ratio discriminating circuit for discriminating a ratio of a high-level precedent portion to one period of an information signal whose level varies periodically, on the basis of threshold values. A sequencer outputs a shift signal to obtain a first threshold level, by detecting the precedent portion of the information signal to output a sampling signal. A subsequent portion of the information signal is detected to output a lath signal, and both the precedent and subsequent portions of the information signal are detected to output a reset signal. A counter circuit detects a time period of the precedent portion of the information signal by counting a number of reference clock signals to obtain count data. A shift circuit shifts the count data. A discriminating circuit obtains a discriminate point by comparing a time period of the subsequent portion of the information signal with a second threshold value corresponding to the count data shifted by the shift circuit. An output circuit outputs a duty ratio discriminate signal on the basis of a relationship between the discriminate point output by the discrimination circuit and the subsequent portion time data.
REFERENCES:
patent: 3961271 (1976-06-01), Zlydak et al.
patent: 4008488 (1977-02-01), Osborne
patent: 4756013 (1988-07-01), Van Velohuizen
patent: 4841932 (1989-06-01), Hansen et al.
patent: 5210444 (1993-05-01), Johnson
Callahan Timothy P.
Kabushiki Kaisha Toshiba
Lam T.
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