Method and apparatus to center the frequency of a...

Details Method and apparatus to center the frequency of a... Method and apparatus to center the frequency of a...

2008-01-01

2008-01-01

Lee, Benny (Department: 2817)

Oscillators

With frequency calibration or testing

C331S010000, C331S025000, C331S03600C, C331S00100A, C331S17700V, C327S157000

Reexamination Certificate

active

07315218

ABSTRACT:
A circuit and method are provided for calibrating an analog oscillator in the digital domain. The circuit and method disclosed herein centers an oscillation frequency of an analog oscillator by producing a binary signal to which the analog oscillator is responsive. Changes in the binary digital signal cause the oscillation frequency of the analog oscillator to shift in a desired direction to calibrate the analog oscillator. At the completion of the calibration process, the control of the oscillation frequency of the analog oscillator is switched to the analog domain so that the analog oscillator is responsive to an analog control voltage to shift the oscillation frequency.

REFERENCES:
patent: 6545545 (2003-04-01), Fernandez-Texon
patent: 2001/0020875 (2001-09-01), Jansson
patent: 2002/0075080 (2002-06-01), Nelson et al.
patent: 2002/0167362 (2002-11-01), Justice et al.
patent: 2005/0258906 (2005-11-01), Su et al.

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