Use of configurable capacitors to tune a self biased phase...

Details Use of configurable capacitors to tune a self biased phase... Use of configurable capacitors to tune a self biased phase...

2005-03-29

2005-03-29

Callahan, Timothy P. (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S03600C, C327S156000, C327S553000

Reexamination Certificate

active

06873214

ABSTRACT:
A phase locked loop (PLL) comprising an input, an output, a charge generator, a low pass filter3, an oscillator4and a frequency divider5. The frequency divider5has an input coupled to the output of the PLL and an output coupled to an input of the charge generator. The frequency at the output of the frequency divider5is equal to the frequency at the input of the frequency divider divided by a selectable divider ratio N. The PLL has a damping factor z and a bandwidth to compare frequency ratio ω3/ωref. The low pass filter3has a first capacitor for integrating the charge produced by the charge generator. The capacitance of that first capacitor is arranged to be proportional to the divider ratio N so that the damping factor z and the bandwidth to compare frequency ratio ω3/ωrefare substantially independent of the divider ratio N.

REFERENCES:
patent: 4928075 (1990-05-01), Leis
patent: 5420545 (1995-05-01), Davis et al.
patent: 6097227 (2000-08-01), Hayashi
patent: 6101257 (2000-08-01), Lubbe et al.
patent: 6137372 (2000-10-01), Welland
patent: 6211745 (2001-04-01), Mucke et al.
patent: 6373304 (2002-04-01), Drost et al.
patent: 6462594 (2002-10-01), Robinson et al.
patent: 0 461 358 (1991-12-01), None
patent: 1 005 167 (2000-05-01), None
patent: 2 282 285 (1995-03-01), None
Michael Harwood, “Improvements in or Relating to Phase Locked Loops” British Patent Application No. 0030859.3, Filed Dec. 18, 2000.
Matsushita Abstract PAJ vol. 1994, No. 018661.

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