Clock signal producing device

Details Clock signal producing device Clock signal producing device

1999-06-01

2000-10-24

Nuton, My-Trang

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327159, H03L 706

Patent

active

061373265

ABSTRACT:
A clock signal producing device produces a clock signal, which is in synchronism with an inputted reference signal and has a frequency other than a frequency of an integer multiple of the reference signal or other than a frequency of the reference signal divided by an integer. The clock signal producing device is provided with the low pass filter (LFP) 4 and the frequency dividing section 10 comprising the phase calculation section 1, the sinusoidal calculation section 2, and the D/A (digital to analog) converting section 3. An output signal of the LPF 4 is supplied to the phase comparator 5. The phase calculation section 1 calculates a phase .theta. (nT) of the reference signal S.sub.REF separately in a integer part and in a decimal part at a time of generation t=nT, where "n" is an integer and T is a period of the clock signal S.sub.CL, and outputs a value of the integer part as a digital phase value. The sinusoidal calculation section 2 converts the digital phase value into an amplitude value of a sinusoidal wave signal. The amplitude value is converted from digital to analog and supplied to the phase comparator 5.

REFERENCES:
patent: 3913028 (1975-10-01), Bosselaers
patent: 5382921 (1995-01-01), Estrada et al.
patent: 5506982 (1996-04-01), Hotta et al.
patent: 5737373 (1998-04-01), Sato et al.
patent: 6046645 (2000-04-01), Cucchi et al.
patent: 6072369 (2000-06-01), Dhong et al.

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