Method and apparatus for calibrating a phase locked loop in...

Details Method and apparatus for calibrating a phase locked loop in... Method and apparatus for calibrating a phase locked loop in...

2006-09-29

2008-05-20

Chang, Joseph (Department: 2817)

Oscillators

With frequency calibration or testing

C331S016000, C331S017000

Reexamination Certificate

active

07375595

ABSTRACT:
Methods and apparatus for calibrating a transitional loop, such as a phase locked loop, are disclosed. An example method includes performing an open loop calibration of a voltage controlled oscillator (VCO). The open loop calibration includes tuning the output oscillation frequency of the VCO to within a predetermined range of frequencies. The example method further includes determining a voltage offset and a gain error of an analog to digital converter (ADC) coupled with the phase locked loop. The example method also includes determining a gain offset of the open loop calibrated VCO using the voltage offset and the gain error of the ADC. In the example method, a signal provided by a charge pump of the PLL is adjusted based on the determined gain offset.

REFERENCES:
patent: 6998922 (2006-02-01), Jensen et al.
patent: 2005/0073369 (2005-04-01), Balboni et al.
patent: 2005/0156676 (2005-07-01), Wang et al.
patent: 2006/0139105 (2006-06-01), Maxim et al.

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