BROWSE
Detail
Conference Paper
Q - Enhanced 5GHz CMOS VCO Using 4-port Transformer
Cited 10 time in 
Share 
Share
- Authors
- Young Jae Lee, Cheon Soo Kim
- Issue Date
- 2007-01
- Citation
- Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) 2007, pp.119-122
- Language
- English
- Type
- Conference Paper
- Abstract
- The LC VCO having oscillation frequency of 5GHz and using the transformer-coupled LC tank in 0.13μm CMOS technology is developed. The LC tank that employs the drain-gate transformer feedback configuration is composed of a 4-port transformer and varactor diodes. The transformer has the quality factor increased by 1+k where k is the coupling factor between each port and it is characterized to propose the equivalent circuit for the 2-port transformer using the measured S-parameters. The measured phase noise of LC VCO is -110dBc/Hz at the offset frequency of 1MHz and the tuning range of 450MHz is achieved. © 2007 IEEE.
- KSP Keywords
- CMOS Technology, CMOS VCO, Coupling Factor, Equivalent Circuit, LC tank, LC voltage controlled oscillator(LC-VCO), Oscillation Frequency, Quality-factor(Q-factor), Transformer coupled, Transformer feedback, Tuning Range