Patent ID: 7315220

Claim:
A voltage controlled oscillator (VCO) comprising: a first n-channel latch having a first output and a second output; a first P-channel transistor coupled between a voltage supply and a first VCO output, wherein a gate of the first P-channel transistor is coupled to the first output of the first n-channel latch; a first programmable resistor circuit coupled between the first VCO output and the first output of the first n-channel latch; a second n-channel latch coupled to the first VCO output; a second P-channel transistor coupled between the voltage supply and a second VCO output, wherein a gate of the second P-channel transistor is coupled to the second output of the first n-channel latch; and a second programmable resistor circuit coupled between the second VCO output and the second output of the first n-channel latch wherein the second programmable resistor circuit comprises a plurality of transmission gates controlled by the coarse control input and one or more transistors controlled by the fine voltage control input.