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A 4.39–5.26 GHz LC-Tank CMOS Voltage-Controlled Oscillator With Small VCO-Gain Variation

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4 Author(s)
Young-Jin Moon ; Dept. of Electron. & Comput. Eng., Hanyang Univ., Seoul, South Korea ; Yong-Seong Roh ; Chan-Young Jeong ; Changsik Yoo

A wide band CMOS LC-tank voltage controlled oscillator (VCO) with small VCO gain (KVCO) variation was developed. For small KVCO variation, serial capacitor bank was added to the LC-tank with parallel capacitor array. Implemented in a 0.18 mum CMOS RF technology, the proposed VCO can be tuned from 4.39 GHz to 5.26 GHz with the VCO gain variation less than 9.56%. While consuming 3.5 mA from a 1.8 V supply, the VCO has -113.65 dBc/Hz phase noise at 1 MHz offset from the carrier.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:19 ,  Issue: 8 )