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A Low-Voltage Quadrature CMOS VCO Based on Voltage-Voltage Feedback Topology

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5 Author(s)
Chuang, Y.-H. ; Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei ; Lee, S.-H. ; Yen, R.-H. ; Jang, S.-L.
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A novel low-voltage quadrature voltage-controlled oscillator (QVCO) with voltage feedback to the input gate of a switching amplifier is proposed and implemented using the standard TSMC 0.18-mum CMOS 1P6M process. The proposed circuit topology is made up of two low-voltage LC-tank VCOs, where the coupled QVCO is obtained using the transformer coupling technique. At the 0.7-V supply voltage, the output phase noise of the VCO is -124.9 dBc/Hz at 1-MHz offset frequency from the carrier frequency of 2.4GHz, and the figure of merit is -185.35dBc/Hz. Total power consumption is 5.18 mW. Tuning range is about 135 MHz while the control voltage was tuned from 0 to 0.7V

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:16 ,  Issue: 12 )

Date of Publication:

Dec. 2006

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