Design of voltage controlled oscillator (VCO) for ultra wideband (UWB) CMOS frequency synthesizer

• Main Authors: M., Awan, S., Zafar, T.Z.A., Zulkifli
• Format: Conference or Workshop Item
• Published: 2007
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utp.edu.my/314/1/paper.pdf; http://www.scopus.com/inward/record.url?eid=2-s2.0-57949104618&partnerID=40&md5=45d0825112b7ddb3acf59481bd7850c1; http://eprints.utp.edu.my/314/
• Institution: Universiti Teknologi Petronas

Voltage controlled oscillator is one of the fundamental building blocks in the frequency synthesizer architecture. A 4.224-GHz CMOS complementary cross-coupled LC-VCO is designed for multi-band OFDM (MB-OFDM) ultra-wideband (UWB) application. The tuning range of the VCO is from 3.77-GHz to 4.27-GHz or 12-%, which was achieved through pMOS based varactors. The VCO core current consumption is 1.9-mA from a 1.8-V supply voltage. With the combination of source damping resistance of 40-Ω, multi-finger gate structure of pMOS based varactors the 2-μm x 284 fingers and tail biasing resistance of 232-Ω, the phase noise were simulated at - 94.7-dBc/Hz and -120.1-dBc/Hz at 100-kHz and 1-MHz offset, respectively. The VCO circuit is designed in Silterra 0.18-μm 1-poly 6-metal RFMOS process technology. ©2007 IEEE.