Patent ID: 6486744
Filing Date: 2002-11-26
Classification: H03B

Abstract:
A voltage-controlled oscillator comprising:a resonator comprising a three-finger interdigital filter and a plurality of varactors, a first varactor coupled to a first finger of the interdigital filter and a ground terminal, a second varactor coupled to a third finger of the interdigital filter and a ground terminal, a second finger of the interdigital filter coupled to a ground terminal, wherein the first and second varactors are configured to alter a resonant frequency of the interdigital filter to a desired frequency in response to a tuning voltage applied to the resonator; and a negative resistance generator coupled to the resonator, the negative resistance generator configured to receive a first signal from the resonator, the first signal having a frequency, the negative resistance generator configured to output a second signal, the second signal having a substantially similar frequency and a higher amplitude compared to the first signal.