Patent ID: 8264290

Claim:
A dual positive-feedbacks voltage controlled oscillator, comprising: an oscillation circuit, including a first transistor, a second transistor, an inductor and a plurality of capacitors, and the gate of the first transistor opposite to the gate of the second transistor, and the gates of the first and second transistors being respectively coupled to two points of the inductor, wherein the inductor and the capacitors are formed as a LC tank; and a cross coupled pair circuit, including a third transistor and a fourth transistor, the gate of the third transistor and the gate of the fourth transistor cross coupled to the two points of the inductor, the gate of the third transistor coupled to the gate of the second transistor, the gate of the fourth transistor coupled to the gate of the first transistor, the drain of the third transistor directly coupled to the source of the first transistor, and the drain of the fourth transistor directly coupled to the source of the second transistor.