Patent ID: 7075379

Claim:
A voltage-controlled oscillator circuit connected to supply and reference voltages for radio frequency operation, comprising: at least one inductor; at least one varactor connected in parallel with the at least one inductor; a pair of p-channel MOS transistors connected across the at least one varactor, each p-channel transistor having source, drain, and gate terminals, wherein the drain terminal of the first of the pair of p-channel MOS transistors is connected to the gate terminal of the second of the pair of p-channel MOS transistors and the drain terminal of the second of the pair of MOS transistors is connected to the gate terminal of the first of the pair of MOS transistors; and biasing means for providing a biasing current to the voltage-controlled oscillator circuit and for substantially widening the tuning range thereof, the biasing means being configured according to a biasing n-channel MOS transistor connected to the supply voltage and self-biasing p-channel MOS transistor connected to the reference voltage, wherein the biasing means is connected to the pair of p-channel MOS transistors and the at least one inductor.