Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Patent
1995-01-03
1996-06-25
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
327116, 327284, 377 47, H03B 1900
Patent
active
055303870
ABSTRACT:
A frequency multiplier circuit comprising a first delay circuit for delaying sequentially a reference clock signal, a frequency doubler for delaying the reference clock signal and combining logically the delayed reference clock signal and the reference clock signal, a second delay circuit for delaying sequentially an output signal from the frequency doubler, a signal detector for logically combining the output signal from the frequency doubler and a plurality of output signals from the second delay circuit to detect a desired duty factor of signal, a decoder for decoding a plurality of output signals from the first delay circuit and a plurality of output signals from the signal detector to output a signal delayed by n times half a period of the reference clock signal, and a frequency generator for logically combining an output signal from the decoder and the reference clock signal to generate a multiple frequency of that of the reference clock signal. According to the present invention, the frequency multiplier circuit can automatically adjust an operating point regardless of a variation in a temperature or a process parameter.
REFERENCES:
patent: 4596954 (1986-06-01), Haque
patent: 4707665 (1987-11-01), Nugent et al.
patent: 4799022 (1989-01-01), Skierszkan
patent: 5077686 (1991-12-01), Rubinstein
patent: 5111066 (1992-05-01), Artieri et al.
patent: 5321734 (1994-06-01), Ogata
patent: 5365181 (1994-11-01), Mair
Callahan Timothy P.
Goldstar Electron Co. Ltd.
Nu Ton My-Trang
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