PLL having VCO for dividing frequency

Details PLL having VCO for dividing frequency PLL having VCO for dividing frequency

2005-11-22

2005-11-22

Pascal, Robert (Department: 2817)

Oscillators

Electron-coupled type

Piezoelectric crystal resonator

C331S03600C

Reexamination Certificate

active

06967538

ABSTRACT:
A PLL comprising a phase detector, a loop filter and a VCO is disclosed. The phase detector periodically compares an externally inputted clock signal with a frequency of an internal clock signal, and outputs an output signal resulting from phase difference of the two signals. The loop filter outputs a predetermined voltage in response to an output signal from said phase detector. The VCO outputs said internal clock signal having a frequency proportional to said predetermined voltage. Here, the VCO includes a capsule for adjusting the value of capacitance using an internal control signal. As a result, frequencies may be pre-compensated by control signals used in the PLL. In addition, the disclosed PLL having a VCO therein can be configured into a single chip, thereby simplifying the embodiment of the whole PLL and enabling accurate compensation.

REFERENCES:
patent: 4394776 (1983-07-01), Borras et al.
patent: 4472820 (1984-09-01), Borras
patent: 4847571 (1989-07-01), Stevance et al.
patent: 4916716 (1990-04-01), Fenner et al.
patent: 4990866 (1991-02-01), Martheli
patent: 5701598 (1997-12-01), Atkinson
patent: 6137372 (2000-10-01), Welland
patent: 6233441 (2001-05-01), Welland
patent: 6304146 (2001-10-01), Welland
patent: 6327463 (2001-12-01), Welland
patent: 6329855 (2001-12-01), Horie
patent: 6424192 (2002-07-01), Lee et al.
patent: 3135112 (1991-06-01), None
patent: 3139018 (1991-06-01), None
patent: 6104750 (1994-04-01), None
patent: 2002-0028418 (2002-04-01), None
patent: 2002-00066473 (2002-08-01), None
Paul V. Brennan, “Phase-Locked Loops Principles and Practice”, McGraw-Hill, 1996, pp. 1-5.

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