Patent ID: 7304548

Claim:
A differential voltage controlled oscillator comprising: a first complementary transistor and a second complementary transistor having opposite directions of currents flowing to a third electrode from a second electrode in correspondence to a voltage applied between a first electrode and the second electrode; and a resonance circuit being coupled to the second electrodes of the first and second transistors and controlling a frequency of an oscillation signal corresponding to a control voltage, wherein the second electrode of the first transistor is coupled to the first electrode of the second transistor to form a first output terminal, the first electrode of the first transistor is coupled to the second electrode of the second transistor to form a second output terminal, and the third electrodes of the first and second transistors are respectively coupled to a first power and a second power, and the first transistor and the second transistor are serially connected, thereby forming a single ended structure between the first power and the second power.