Method of correcting the phase difference between two input...

Details Method of correcting the phase difference between two input... Method of correcting the phase difference between two input...

2007-09-04

2007-09-04

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S00100A, C331S034000, C331S016000, C327S156000, C327S157000, C327S158000, C327S159000

Reexamination Certificate

active

11304382

ABSTRACT:
A method for correcting the phase difference between two input signals of a phase-locked loop may include a charge pump connected to a filter. Prior to the occurrence of the first of the two input signals, a calibration phase may be carried out in which the input of the filter is disconnected from the output of the charge pump, the output voltage from the charge pump is equalized, to within a given error, with the input voltage of the filter, the amplitudes of the opposing currents flowing in the charge pump being equalized. Then, during the two respective occurrences of the two input signals, the input of the filter is reconnected to the output of the charge pump, and two phase-shifted signals that are delayed with respect to the input signals are respectively generated, in response to which the two opposing currents are, respectively and successively, interrupted, before the calibration phase is recommenced.

REFERENCES:
patent: 6943600 (2005-09-01), Craninckx
patent: 2003/0227332 (2003-12-01), Lee et al.
patent: 0 561 526 (1993-09-01), None
patent: 2 754 959 (1996-10-01), None

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