Patent ID: 6853261
Filing Date: 2005-02-08
Classification: H03B,H03L

Abstract:
1. A method of calibrating a voltage-controlled device in a control loop, wherein the voltage-controlled device includes a frequency adjustable oscillator circuit, and wherein the frequency adjustable oscillator circuit includes a multiple capacitance level capacitor having a plurality of steady-state capacitance levels and a varactor, and wherein the frequency adjustable oscillator circuit inputs a control voltage, the method comprising the steps of: a) determining whether the control loop is in steady state; b) measuring the control voltage; c) determining whether the control voltage is within a first tuning voltage window; d) selecting a steady-state capacitance level that corresponds to control voltage operation of the frequency adjustable oscillator circuit within a second tuning voltage window if the control voltage is not within the first tuning voltage window, wherein the second window is a superset of the first window; and e) returning to the act (a).