A wide tuning range voltage controlled oscillator using common-base configuration and inductive feedback

Jhe Jia Kuo*, Zuo-Min Tsai , Ping Chen Huang, Chau Ching Chiong, Kun You Lin, Huei Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Usually the tuning range of voltage controlled oscillator (VCO) is much narrower than the possible resonant frequency range of the tank at different tuning voltages. In this letter we analyze the traditional common-base type VCO, give a simple but useful insight about the mechanism behind the topology, and verified the conclusions with a 2 μm heterojunction bipolar transistor (HBT) VCO. The results show that with the CB configuration, proper feedback inductor and wide tuning range varactor, the tuning range can be almost the same as the resonant frequency range of the tank at different tuning voltages. A wideband voltage controlled oscillator using a commercial 2 μ HBT echnology is designed, fabricated and measured. The varactor with wide range of capacitance is used to achieve 53.33% measured tuning range from 9.46 to 16.34 GHz. The measured phase noise at 1 MHz offset is between -90 and -10 dBc/Hz. The total chip size is 1 mm 2 including all testing pads, while the core area is 0.64 mm 2 . The VCO is suitable for wideband application such as in measurement equipment or astronomical exploring telescopes.

Original languageEnglish
Article number5233898
Pages (from-to)653-655
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume19
Issue number10
DOIs
StatePublished - 1 Oct 2009

Keywords

  • Heterojunction bipolar transistor (HBT)
  • RFIC
  • Voltage controlled oscillator (VCO)
  • Wideband

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