Calibration circuit for VCO

Details Calibration circuit for VCO Calibration circuit for VCO

2006-10-10

2006-10-10

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S208000, C455S262000, C375S327000

Reexamination Certificate

active

07120412

ABSTRACT:
A phase-locked loop circuit includes an array of selectable capacitors formed within the phase-locked loop circuit to enable the phase-locked loop circuit to provide a degree of coarse frequency control by adding or removing capacitors and a degree of fine frequency control by sinking or sourcing current from a charge pump into a loop filter. A finite state machine is provided within a voltage controlled oscillator calibration circuit that communicates with an external baseband processor to initiate a calibration process, and further to determine how many capacitors of an array of capacitors if formed within the phase-locked loop circuit should be coupled to provide the coarse frequency control.

REFERENCES:
patent: 6028488 (2000-02-01), Landman et al.
patent: 6137372 (2000-10-01), Welland
patent: 6549764 (2003-04-01), Welland
patent: 6606004 (2003-08-01), Staszewski et al.
patent: 6670861 (2003-12-01), Balboni
patent: 6774736 (2004-08-01), Kwek et al.

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