Patent ID: 8159308
Filing Date: 2012-04-17
Classification: H03B,H03L

Abstract:
1. An apparatus comprising: a tank circuit of a voltage controlled oscillator (VCO); a pair of transistors each having a gate, drain, and a source, wherein the drains of the pair of transistors are coupled to the tank circuit; a pair of alternating current (AC) coupling capacitors, wherein the pair of AC coupling capacitors couple the gates of the pair of transistors to the drains of the pair of transistors; a bias circuit coupled to the gates of the pair of transistors to bias the pair of transistors such that the pair of transistors alternatingly turn on during a plurality of peaks of an oscillating signal of the tank circuit and the pair of transistors turn off during a plurality of crossing points of the oscillating signal, wherein a first instantaneous current is provided to the VCO by a power supply coupled to the VCO; a current source coupled to the pair of transistors to provide a bias current for the VCO; and a supply capacitor coupled to a first node of the tank circuit and to a second node in between each of the pair of transistors and the current source to provide a second instantaneous current to supplement the first instantaneous current being supplied by the power supply when one of the pair of transistors is turned on.