Calibration of a phase locked loop

Details Calibration of a phase locked loop Calibration of a phase locked loop

2007-02-06

2007-02-06

Le, Lana (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S260000, C455S313000, C455S084000

Reexamination Certificate

active

10243854

ABSTRACT:
Calibration of a phase locked loop and applications thereof within a radio frequency integrated circuit begins by determining an intersection of an up current and down current produced by a charge pump within the phase locked loop. The RFIC then determines a reference voltage corresponding to the intersection, which varies from an ideal voltage of VDD/2 based on process variations. The RFIC then offsets a control voltage to the voltage control oscillator (VCO) of the phase locked loop based on the reference voltage. Accordingly, by determining the offset of the actual intersection from the ideal intersection, the control voltage to the VCO may be adjusted thereby calibrating the phase locked loop for more linear performance.

REFERENCES:
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 6078634 (2000-06-01), Bosshart
patent: 6608511 (2003-08-01), Hsu
patent: 7120412 (2006-10-01), Anand
patent: 2003/0117189 (2003-06-01), Beghein
patent: 2003/0119467 (2003-06-01), Welland et al.
patent: 2003/0232610 (2003-12-01), Lin et al.
patent: 2006/0139105 (2006-06-01), Maxim et al.

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