Browsing by Author "Ke, Han-Tzung"

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A Ultra Low Power 5.4-GHz Current-Reused VCO with Internal LC Series Resonance in 0.18-1-mu m CMOS Technology
(2010-01-01)
Shen, I-Shing
;
Ke, Han-Tzung
;
Jou, Christina F.
;
電信工程研究所
;
Institute of Communications Engineering
A novel circuit topology suitable for the implementation of CMOS voltage-controlled-oscillator (VCO) fabricated in TSMC 0.18-mu m 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.