Patent ID: 9450588
Filing Date: 2016-09-20
CPC Classification: H03B,H03L

Claim Text:
1. A voltage controlled oscillator (VCO), comprising: a sensing circuit, wherein the sensing circuit is configured to generate a plurality of compensation control signals according to a process variation or a temperature variation of the VCO; a voltage-to-current converter comprising a plurality of current sources which are configured to generate a current signal in response to the plurality of compensation control signals; a plurality of switching circuits, each of the plurality of switching circuits being configured to selectively enable or disable a corresponding one of the plurality of current sources in response to a corresponding one of the plurality of compensation control signals; and a current controlled oscillator configured to generate an oscillating signal in response to the current signal, wherein the sensing circuit is configured to generate the plurality of compensation control signals free of a feedback signal based on the oscillating signal.