Title :
CMOS QVCO With Current-Reuse, Bottom-Series Coupling, and Forward Body Biasing Techniques
Author :
Ho-Jun Chang ; Changwoo Lim ; Tae-Yeoul Yun
Author_Institution :
Dept. of Electron. Eng., Hanyang Univ., Seoul, South Korea
Abstract :
This letter presents an LC-tank quadrature voltage-controlled oscillator (QVCO) using bottom-series coupling, forward body biasing, and current-reuse techniques. The bottom-series coupling to generate the quadrature signals enhances the phase noise performance. The forward body biasing of the switching and coupling transistors is used to alleviate the voltage headroom issue for stacked transistors. In addition, the current-reuse technique reduces the current consumption. A phase shift analysis for QVCOs introduces how to choose device sizes for a better Q-factor of the LC-tank. The proposed QVCO showed a phase-noise figure-of-merit of -190.9 dBc/Hz and a frequency tuning range from 5.80 to 6.44 GHz, while having a low power consumption of 2 mW for the core QVCO from a supply of 1.05 V.
Keywords :
CMOS analogue integrated circuits; Q-factor; microwave integrated circuits; microwave oscillators; voltage-controlled oscillators; CMOS QVCO; LC-tank; LC-tank quadrature voltage-controlled oscillator; Q-factor; bottom-series coupling techniques; coupling transistors; current-reuse techniques; forward body biasing techniques; frequency 5.80 GHz to 6.44 GHz; phase shift analysis; phase-noise figure-of-merit; power 2 mW; quadrature signals; stacked transistors; switching transistors; voltage 1.05 V; voltage headroom issue; CMOS integrated circuits; Couplings; Phase noise; Switching circuits; Transistors; Voltage-controlled oscillators; Wireless communication; Bottom-series coupling; QVCO; current reuse; forward body biasing; low power; phase noise;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2014.2326522
