Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Patent
1993-11-10
1995-06-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
327 37, 327 35, 360 46, 360 51, H03K 526, H03K 519
Patent
active
054246687
ABSTRACT:
In a pulse duty ratio discrimination circuit for discriminating duty ratios of input signals by comparing a count value with a threshold value through means of counting, with a counter using clocks, a time period starting with a reference level changing point occurring every predetermined period in the input signal and ending with a level returning point, the present invention is characterized by a pulse duty ratio discrimination circuit that includes not only period determination means for determining the periods of the input signals by resetting the count value of the counter at the period of the input signal and by comparing actual count values for a plural number of count patterns of the counter established in advance, but also clock selection means for selecting the frequency of the clock based on a determination result of the period determination means.
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Patent Abstracts of Japan, vol. 14, No. 268 (E-939)(4211) 11 Jun. 1990 & JP-A-02 084 812 (NEC Corp) 26 Mar. 1990 *abstract*.
Patent Abstracts of Japan, vol. 016, No. 237 (P-1362) 29 May 1992 & JP-A-04 050 775 (Toshiba Corp) 19 Feb. 1992 *abstract*.
Patent Abstracts of Japan, vol. 012, No. 457 (E-688) 30 Nov. 1988 & JP-A-63 182 911 (Hitachi Ltd) 28 Jul. 1988 *absract*.
Patent Abstracts of Japan, vol. 012, No. 361 (P-763) 28 Sep. 1988 & JP-A-63 113 366 (Rohm Co Ltd) 18 May 1988 *abstract*.
Callahan Timothy P.
Englund Terry L.
Kabushiki Kaisha Toshiba
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