Design of Low Phase Noise and Wide Tuning Range CMOS VCO Based on NMOS Cross-Coupled Topology with Body-Biased Technique and Magnetic Tuning Technique

• Main Authors: YU JU CHIU, 邱昱儒
• Other Authors: Meng-Ting Hsu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/66177105817312230930

碩士 === 國立雲林科技大學 === 電子工程系 === 102 === The fast-growing market in wireless communications requires small, cheap, wide band, low phase noise and low power RF circuits. The major challenge lies in the design of fully integrated low phase noise and low power voltage controlled oscillators (VCOs) with appropriate tuning range performance simultaneously. The voltage-controlled oscillator (VCO) is one of the most important building blocks in the system. The chip fabrication of VCO is made by TSMC 0.18μm 1P6M CMOS standard process. The first chip presents a low power and low phase noise voltage controlled oscillator (VCO) for IEEE 802.11a applications, the two Current-Reused and tail transistor technology is designed to improve phase noise and power. The measured results exhibited phase noise -113.32 dBc/Hz at 1MHz offset frequency. Measured tuning range is about 11.3% from 5.05 GHz to 5.65 GHz and power dissipation is 2.03 mW under supply voltage is 1.4V. The second chip presents a low power voltage controlled oscillator (VCO) for IEEE 802.11a applications, the center-tap transformer and body-bias technology is designed to improve power and tuning range. The measured results exhibited phase noise -113.44 dBc/Hz at 1MHz offset frequency. Measured tuning range is about 27.95% from 4.71 GHz to 6.24 GHz and power dissipation is 4.12 mW under supply voltage is 0.9V.