Clock signal extraction apparatus using VCO having plurality of

Details Clock signal extraction apparatus using VCO having plurality of Clock signal extraction apparatus using VCO having plurality of

1995-06-01

1996-06-18

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 11, 331 14, 331 17, 331 25, H03L 7087, H03L 7099

Patent

active

055281982

ABSTRACT:
A plurality of clock signals at an identical frequency but with different phases are oscillated by a voltage-controlled oscillator beforehand, and selection is made of one of the clock signals whose phase is closest to that of the data signal each time the data signal rises. In parallel with the selection of phase, a phase/frequency comparison is made between any one of the clock signals output from the voltage-controlled oscillator and the selected clock signal. After the comparison, the oscillation frequency of the voltage-controlled oscillator is converted for their matching. This matching allows acquisition of a clock signal with the closest phase immediately after arrival of the data signal, and acquisition of an extraction clock signal with the frequency and phase matched in a short time by parallel conversion of the oscillation frequency of the voltage-controlled oscillator.

REFERENCES:
patent: 4584695 (1986-04-01), Wong et al.
patent: 5068628 (1991-11-01), Ghoshal
patent: 5126691 (1992-06-01), Mijuskovic et al.
patent: 5157355 (1992-10-01), Shikakura et al.
"Analog PLL with Quick Phase Lock", IBM Technical Disclosure Bulletin, Sep. 1991, vol. 34, No. 4B, pp. 468-473.

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