This paper presents a quadrature VCO that can be reconfigured between 6 and 9 GHz frequency bands. The dual-band VCO comprises a 6-GHz LC VCO, two 1/2-dividers, two mixers, and two 3-GHz notch filters. The 9-GHz output is generated based on a fractional frequency multiplication method by mixing the 6-GHz VCO output with its divide-by-two signal. The VCO, implemented in a 0.18-μm SiGe BiCMOS technology, shows a fast switching time of 3.6 nsec. The measured VCO phase noises are -106 dBc/Hz and -104 dBc/Hz at 1 MHz offset for 6 and 9-GHz modes, respectively, while draining 10.8 mA from a 1.8-V supply.
|Number of pages||4|
|State||Published - 1 Jan 2002|
|Event||2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium - Seatle, WA, United States|
Duration: 2 Jun 2002 → 4 Jun 2002
|Conference||2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium|
|Period||2/06/02 → 4/06/02|