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Analysis and Design of a Wide-Tuning-Range VCO With Quadrature Outputs

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2 Author(s)
Shuenn-Yuh Lee ; Dept. of Electr. Eng., Nat. Chung-Cheng Univ., Chiayi ; Ching-Yi Chen

A quadrature voltage-controlled oscillator (QVCO) with a wide tuning range is proposed and implemented in the TSMC 0.18- mum CMOS process. The said QVCO uses a cross-coupled structure and a current-reuse technology to produce the quadrature signal and to save power consumption and area, respectively. Based on our measurement, the phase noise with 1-MHz offset from the carrier frequency of 3.6 GHz is - 114 dBc/Hz and the proposed QVCO has a wide-band tuning range of 3.6-4.9 GHz. Also, the maximal phase error and power imbalance are less than 5deg and 1.5 dB, respectively, and the power consumption is 8 mW at 2-V power supply voltage.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:55 ,  Issue: 12 )

Date of Publication:

Dec. 2008

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