Abstract: A fractional-N PLL with programmable fractionality having a phase detector and an oscillator is disclosed. The phase detector is for receiving a reference signal having a reference frequency and the oscillator is for providing an output signal having an output frequency. The fractional-N PLL comprises a divider for performing frequency divisions by applying selectable divisors, the divider being disposed in the loop of the fractional-N PLL for receiving the output signal from the oscillator and in response thereto provide a first signal having an averaged frequency.

Abstract: A voltage-controlled oscillator circuit connected to supply and reference voltage for radio frequency operation is disclosed. The circuit comprises at least one inductor and at least one varactor connected in parallel with the at least one inductor. The circuit also comprises a pair of p-channel MOS transistors connected across the at least one varactor, each p-channel MOS 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 second of the pair of MOS transistors being connected to the gate terminal of the first of the pair of MOS transistors.