Calibration of voltage controlled oscillators

Details Calibration of voltage controlled oscillators Calibration of voltage controlled oscillators

2008-07-10

2010-06-01

Chang, Joseph (Department: 2817)

Oscillators

With frequency calibration or testing

C331S182000, C331S176000

Reexamination Certificate

active

07728679

ABSTRACT:
A calibration circuit (20, 50) and method (60) for calibrating the bias current of a VCO (10, 40) to minimize phase noise. The calibration circuit (20, 50) monitors the average voltage at the common-mode node of the VCO (10, 40) while varying the bias current over a predetermined range. The calibration circuit (20, 50) identifies the bias current associated with the minimum average common-mode voltage and utilizes this bias current for calibrating the biasing transistor of the VCO (10, 40).

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