Patent ID: 7728676
Filing Date: 2010-06-01
Classification: H03B,H03J,H03L

Abstract:
1. A voltage-controlled oscillator (VCO) comprising: a first circuit operable to determine an output common mode voltage associated with an output of the VCO; a second circuit comprising an amplifier circuit operable to generate an upper control voltage limit and a lower control voltage limit associated with a control voltage received by the VCO, wherein the amplifier circuit is operable to generate the upper control voltage limit based on the output common mode voltage and a first predetermined voltage, and generate the lower control voltage limit based on the output common mode voltage and a second predetermined voltage; a comparator circuit operable to compare the control voltage to the upper and lower control voltage limits; and a control unit operable to determine whether to change a switched capacitance associated with the VCO based, at least in part, on whether the control voltage is outside the upper and lower control voltage limits.