Method and apparatus for calibrating a voltage controlled...

Details Method and apparatus for calibrating a voltage controlled... Method and apparatus for calibrating a voltage controlled...

2007-08-17

2010-06-01

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S016000, C331S018000, C331S057000, C331S185000

Reexamination Certificate

active

07728677

ABSTRACT:
Methods and apparatus are provided for calibrating a voltage controlled oscillator, such as an N-stage voltage controlled ring oscillator. The voltage controlled oscillator comprises a power supply input and at least one gate delay element and has a frequency that is a function of a delay of the gate delay element and a voltage applied to the power supply input. A voltage controlled oscillator is calibrated by varying an output voltage of a programmable voltage source through a range of values; applying the output voltage to the power supply input of the voltage controlled oscillator; comparing an output clock frequency of the voltage controlled oscillator to a reference frequency clock for each of the output voltage values; and selecting a value of the output voltage that provides an approximate minimum frequency difference between the output clock frequency and the reference frequency clock.

REFERENCES:
patent: 5959502 (1999-09-01), Ovens et al.
patent: 6928128 (2005-08-01), Sidiropoulos
patent: 6940359 (2005-09-01), Ishii
patent: 7126433 (2006-10-01), Godambe et al.
patent: 2003/0179842 (2003-09-01), Kane et al.
patent: 2003/0210099 (2003-11-01), Ingino, Jr.
patent: 2004/0008063 (2004-01-01), Kim et al.
patent: 2007/0030079 (2007-02-01), Kawamoto et al.

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