Design and analysis of VCO with tunable ring filter

Abstract

To realize a voltage controlled oscillator (VCO) in wireless communications, a device is developed using a new tunable ring filter. The oscillator is based upon the tunable ring filter, with a compact and sharp rejection filter, high performance active inductor. It operates in the 3.2 GHz to 4.1 GHz frequency range. The VCO's phase noise level is -93dBc/Hz at 100kHz offset from a 3.5GHz carrier.