DocumentCode :
108495
Title :
A Startup Robust Feedback Class-C VCO With Constant Amplitude Control in 0.18 
m CMOS
Author :
Zhangming Zhu ; Liang Liang ; Yintang Yang
Author_Institution :
Sch. of Microelectron., Xidian Univ., Xi´an, China
Volume :
25
Issue :
8
fYear :
2015
fDate :
Aug. 2015
Firstpage :
541
Lastpage :
543
Abstract :
A feedback class-C VCO with constant amplitude control is presented in this letter. Its dual-loop topology helps to stabilize amplitude and ensure startup robustness over process, voltage and temperature (PVT) variations. Besides, this VCO facilitates a direct amplitude calibration method to find optimal point for different applications. A prototype VCO is implemented in a 0.18 μm CMOS process. Measurement shows the VCO has a 4.55-5.16 GHz frequency tuning range and a phase noise of -123.3 dBc/Hz at 1 MHz offset from a 5 GHz carrier with a 2.78 mW power consumption. The FOM is -192.8 dBc/Hz.
Keywords :
CMOS integrated circuits; field effect MMIC; microwave oscillators; phase noise; voltage-controlled oscillators; CMOS process; constant amplitude control; direct amplitude calibration; dual loop topology; frequency 4.55 GHz to 5.16 GHz; phase noise; power 2.78 mW; size 0.18 mum; startup robust feedback class-C VCO; temperature variation; voltage variation; Detectors; Phase noise; Robustness; Stability analysis; Tuning; Voltage-controlled oscillators; Class-C; constant amplitude control; startup; time varying bias; voltage controlled oscillator (VCO);
fLanguage :
English
Journal_Title :
Microwave and Wireless Components Letters, IEEE
Publisher :
ieee
ISSN :
1531-1309
Type :
jour
DOI :
10.1109/LMWC.2015.2440871
Filename :
7130679
Link To Document :
