Calibrating a loop-filter of a phase locked loop

Details Calibrating a loop-filter of a phase locked loop Calibrating a loop-filter of a phase locked loop

2005-12-06

2005-12-06

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S044000, C327S156000

Reexamination Certificate

active

06972633

ABSTRACT:
The invention relates to a method of automatically calibrating a loop-filter of a phase locked loop, which loop-filter comprises at least one RC-filter component and is integrated on a single chip together with at least one RC-filter component of another entity than the phase locked loop. In order to simplify a calibration of the loop-filter, the method comprises tuning the at least one RC-filter component of the loop-filter based on measurements performed on the at least one RC-filter component of the other entity. The invention relates equally to an integrated circuit chip comprising means for realizing this method and to a unit including such a chip.

REFERENCES:
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patent: 6281829 (2001-08-01), Amrany et al.
patent: 6583662 (2003-06-01), Lim
patent: 6731145 (2004-05-01), Humphreys et al.
patent: 2002/0190810 (2002-12-01), Nystrom et al.
patent: 0910165 (1999-04-01), None
patent: WO 02/073801 (2002-09-01), None
W. Thommann et al., “Fully Integrated W-CDMA If Receiver and If Transmitter Including If Synthesizer and On-Chip VCO for UMTS Mobiles”, IEEE Journal of Solid-State Circuits, IEEE Inc., New York, US, Sep. 2001, pp. 1407-1419.
A.M. Durham et al., “Circuit Architectures for High Linearity Monolithic Continuous-Time Filtering”, IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, IEEE Inc., New York, US, Sep. 1, 1991; pp. 651-657.

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