Clock generating circuit with a frequency multiplying circuit

Details Clock generating circuit with a frequency multiplying circuit Clock generating circuit with a frequency multiplying circuit

2005-12-06

2005-12-06

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Clock or pulse waveform generating

C327S292000

Reexamination Certificate

active

06972608

ABSTRACT:
A reference clock oscillating circuit intermittently carries out an oscillating operation on the basis of an oscillation control signal from an oscillation control circuit. A frequency multiplying circuit successively measures the period of a reference clock signal by using a measuring clock signal generated therein during a period for which the reference clock signal is input from the reference clock oscillating circuit, and generates a multiplied clock signal by using the period data thus measured. During a period for which no reference clock signal is input, the multiplied clock signal is generated by using the period data stored in a period data register. The interval of the intermittent oscillating operation is set on the basis of temperature variation of IC or the like.

REFERENCES:
patent: 5517155 (1996-05-01), Yamauchi et al.
patent: 5789985 (1998-08-01), Yamauchi et al.
patent: 6515519 (2003-02-01), Miyazaki et al.
patent: A-2000-357947 (2000-12-01), None

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