Title :
A feedback class-C VCO with robust startup condition over PVT variations and enhanced oscillation swing
Author :
Deng, Wei ; Okada, Kenichi ; Matsuzawa, Akira
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Tokyo, Japan
Abstract :
This paper presents a feedback class-C VCO with PVT-robustness and enhanced oscillation swing. The proposed VCO starts oscillation as a differential LC-VCO for robust startup, and automatically adapts to an amplitude-enhanced class-C VCO in steady-state for lower phase noise. The proposed VCO is implemented in a 0.18-μm CMOS process. The measured phase noise at room temperature is -125 dBc/Hz @ 1MHz offset with a power dissipation of 3.4 mW, from a carrier frequency of 4.84 GHz. The figure-of-merit is -193 dBc/Hz.
Keywords :
CMOS integrated circuits; phase noise; voltage-controlled oscillators; CMOS process; PVT variation; PVT-robustness; amplitude-enhanced class-C VCO; carrier frequency; feedback class-C VCO; frequency 4.84 GHz; lower phase noise; oscillation swing; power 3.4 mW; power dissipation; robust startup condition; size 0.18 mum; voltage-controlled oscillator; CMOS integrated circuits; Phase noise; Robustness; Steady-state; Temperature measurement; Voltage-controlled oscillators;
Conference_Titel :
ESSCIRC (ESSCIRC), 2011 Proceedings of the
Conference_Location :
Helsinki
Print_ISBN :
978-1-4577-0703-2
Electronic_ISBN :
1930-8833
DOI :
10.1109/ESSCIRC.2011.6044931
