Title :
A Low-Voltage Quadrature CMOS VCO Based on Voltage-Voltage Feedback Topology
Author :
Chuang, Y.-H. ; Lee, S.-H. ; Yen, R.-H. ; Jang, S.-L. ; Juang, M.-H.
Author_Institution :
Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei
Abstract :
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
Keywords :
CMOS integrated circuits; amplifiers; coupled circuits; switching circuits; voltage-controlled oscillators; 0 to 0.7 V; 0.7 V; 1 MHz; 135 MHz; 2.4 GHz; 5.18 mW; CMOS; QVCO; TSMC; control voltage; phase noise; quadrature voltage controlled oscillator; switching amplifier; transformer coupling; voltage voltage feedback topology; CMOS process; Circuit topology; Coupling circuits; Energy consumption; Feedback; Frequency; Phase noise; Tuning; Voltage; Voltage-controlled oscillators; CMOS; low voltage; quadrature voltage controlled oscillator (QVCO); transformer coupling;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.885643
