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Ultra low power 5.4-GHz current-reused VCO with internal LC series resonance in 0.18-µm CMOS technology

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3 Author(s)
I-Shing Shen ; Department of communication Engineering, National ChiaoTung University, Hsinchu, 30010 Taiwan, R.O.C ; Han-Tzung Ke ; Christina F. Jou

A novel circuit topology suitable for the implementation of CMOS voltage-controlled-oscillator (VCO) fabricated in TSMC 0.18-μm has been presented in this paper. While current-reused structure can save dc power consumption dynamically, and measured dc power consumption at 1.2 V is about 0.9 mW. The measurement results exhibit a frequency tuning range of 140 MHz in the vicinity of 5.4 GHz. For high output level, we utilize the cascode structure to increase output swing and excite output power to -2.06 dBm at buffer. The measured phase noise at 1 MHz and DC current are -112.7 dBc/Hz and 0.75 mA, respectively. The result evaluated by means of a figure of merit is about -188 dBc/Hz.

Published in:

2010 Asia-Pacific Microwave Conference

Date of Conference:

7-10 Dec. 2010