Patent ID: 8351867

Claim:
An oscillator comprising at least one voltage to current converter converting a voltage into a current and at least one resonator, wherein the resonator including a pair of LC tanks, each of said LC tanks being formed of a capacitive element and an inductive element connected in parallel, wherein a feedback loop is formed such that an output terminal of the voltage to current converter is connected to the resonator and an output terminal of the resonator is connected to an input terminal of the voltage to current converter, wherein inductive elements constituting the pair of LC tanks constituting the resonator are mutually inductively coupled, wherein two capacitive elements constituting the pair of LC tanks have virtually equal capacitance values and two inductive elements have virtually equal self-inductances, and wherein a coefficient of mutual induction between the inductive elements is set to a predetermined value, based on a relation between the phase of a fundamental signal and the phase of a second harmonic generated from the oscillator.