A 0.98 to 6.6 Hz Tunable Wideband VCO in a 180nm CMOS Technology for Reconfigurable Radio Transceiver

This paper proposes a novel wideband voltage-controlled oscillator (VCO) for multi-band transceivers. The proposed VCO has a core VCO and a tuning-range extension circuit, which consists of switches, a mixer, dividers, and variable gain combiners with a spurious rejection technique. The experimental results exhibit 0.98-to-6.6 GHz continuous frequency tuning with -206dBc/Hz of FoM_T, which is fabricated by using a 0.18 mum CMOS process. The frequency tuning range (FTR) is 149 %, and the chip area is 800 mum x 540 mum.