Patent ID: 7209010

Claim:
An oscillator having a resonant circuit that includes at least one inductance device and at least one tunable capacitance, wherein the tunable capacitance is implemented through diffusion capacitances of at least one current-carrying transistor, wherein the tunable capacitance comprises: a first differential amplifier having a first transistor and a second transistor; and a second differential amplifier having a third transistor and a fourth transistor, wherein electrical properties of the first transistor and second transistor are complementary to electrical properties of the third transistor and fourth transistor, wherein control connections of the first transistor and the complementary third transistor are connected to one another, wherein control connections of the second transistor and the complementary fourth transistor are connected to one another, wherein second current connections of the first transistor and the third transistor are connected to one another, and wherein second current connections of the second transistor and the fourth transistor are connected to one another.