Patent ID: 9257997
Filing Date: 2016-02-09
CPC Classification: H03H,H03L

Claim Text:
1. A method of tuning a voltage controlled oscillator (VCO), comprising: providing a first switched capacitive circuit coupled between a first input of the VCO and a first output of the VCO; providing a second switched capacitive circuit coupled between a second input of the VCO and a second output of the VCO; adjusting capacitive loading of the first switched capacitive circuit over a first range by using a first analog control signal to control an impedance between a first capacitor coupled to the first input of the VCO and a second capacitor coupled to the first output of the VCO while capacitive loading of the second switched capacitive circuit remains at a minimum of a second range; and adjusting capacitive loading of the second switched capacitive circuit over the second range in response to a second analog control signal in sequence after the first range of the first switched capacitive circuit while capacitive loading of the first switched capacitive circuit remains at a maximum of the first range.