Conference Paper

Design of high performance and wide-band VCO with transformer feedback

Dept. & Inst. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Douliou
DOI: 10.1109/APMC.2008.4958309 Conference: Microwave Conference, 2008. APMC 2008. Asia-Pacific
Source: IEEE Xplore

ABSTRACT This paper presents a very low supply voltage, low phase noise and wide tuning range CMOS LC voltage-controlled oscillator with a transformer feedback for a wide-band front-end receiver by a standard 0.18-mum CMOS process. The VCO take an optimum differential transformer to achieve maximize quality factor and minimize the chip area and switching capacitor module are used to maintain a large tuning range. The VCO core power consumption is 6.9 mW from 0.6 V supply and operates with a wide-band from 4.16-5.47 GHz. The measured phase noise is -111.5 dBc/Hz at 1 MHz offset from the carrier frequency at 5.45 GHz.