Frequency synthesizer and high-speed automatic calibration...

Details Frequency synthesizer and high-speed automatic calibration... Frequency synthesizer and high-speed automatic calibration...

2011-08-30

2011-08-30

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

08008956

ABSTRACT:
A frequency synthesizer and an automatic calibration device are disclosed. An automatic calibration device for a phase-locked loop based frequency synthesizer includes: a frequency-to-digital converter for converting a frequency of a signal outputted from a voltage controlled oscillator into a first digital value; a frequency difference detector for calculating a difference between the first digital value outputted from the frequency-to-digital converter and a second digital value corresponding to a target frequency; an automatic frequency calibration logic for selecting an optimal control code for a capacitor bank such that an output frequency of the voltage controlled oscillator is closer to the target frequency; and a loop bandwidth calibration logic for tuning a charge pump gain such that a loop bandwidth is kept constant in the optimal control code using the frequency-to-digital converter. Thus, the calibration speed can be increased, and the loop bandwidth can be kept constant within the output frequency range.

REFERENCES:
patent: 6545545 (2003-04-01), Fernandez-Texon
patent: 6724265 (2004-04-01), Humphreys
patent: 6952124 (2005-10-01), Pham

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