Clock signal generating circuit for generating a clock signal ha

Details Clock signal generating circuit for generating a clock signal ha Clock signal generating circuit for generating a clock signal ha

1996-02-21

2000-05-02

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327159, 327160, 327291, H03B 2100

Patent

active

060577150

ABSTRACT:
A clock signal generating circuit generates a clock signal having a frequency other than frequencies obtained by dividing a predetermined frequency by natural numbers without using a PLL circuit. An oscillator generates a reference clock signal having a reference frequency. A counter counts the reference clock signal to divide the reference frequency of the reference clock signal. A count value output from the counter is reset when the count value reaches a predetermined number. Sine-wave data of a sine-wave is output when the count value is input, a set of the sine-wave data being output for successive numbers of the count value from zero to the predetermined number. The set of the sine-wave data corresponds to a predetermined number of waves of the sine-wave. A digital-to-analog converter converts the set of the sine-wave data into an analog sine-wave signal. A filter selectively filters a predetermined frequency component contained in the analog sine-wave signal. A comparator converts the analog sine-wave signal into a clock signal.

REFERENCES:
patent: 4192007 (1980-03-01), Becker
patent: 4346448 (1982-08-01), Insam et al.
patent: 4398275 (1983-08-01), Zehner
patent: 4484296 (1984-11-01), Treise et al.
patent: 4901027 (1990-02-01), Kitayoshi
patent: 5329253 (1994-07-01), Ichihara
patent: 5382913 (1995-01-01), Carson et al.

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