Automatic frequency calibration apparatus and method for a...

Details Automatic frequency calibration apparatus and method for a... Automatic frequency calibration apparatus and method for a...

2011-07-19

2011-07-19

Chang, Joseph (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S00100A, C331S00100A, C331S010000, C331S011000, C331S045000

Reexamination Certificate

active

07982552

ABSTRACT:
An automatic frequency calibration apparatus and a method thereof for a phase-locked loop based frequency synthesizer are disclosed. The apparatus includes a frequency-to-digital converter configured to convert a frequency of a VCO output signal to a first digital value, a target value setting section configured to provide a second digital value corresponding to a target frequency, and a finite state machine configured to calibrate the frequency of the VCO output signal by using the difference of the first digital value and the second digital value. Accordingly, the calibration speed and a frequency resolution of the automatic frequency calibration apparatus in a frequency synthesizer may be enhanced.

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