K- and Q-bands CMOS frequency sources with X-band quadrature VCO

Sangsoo Ko, Jeong Geun Kim, Taeksang Song, Euisik Yoon, Songcheol Hong

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Fully integrated 10-, 20-, and 40-GHz frequency sources are presented, which are implemented with a 0.18-μm CMOS process. A 10-GHz quadrature voltage-controlled oscillator (QVCO) is designed to have output with a low dc level, which can be effectively followed by a frequency multiplier. The proposed multipliers generate signals of 20 and 40 GHz using the harmonics of the QVCO. To have more harmonic power, a frequency doubler with pinchoff clipping is used without any buffers or de-level shifters. The QVCO has a low phase noise of -118.67 dBc/Hz at a 1-MHz offset frequency with a 1.8-V power supply. The transistor size effect on phase noise is investigated. The frequency doubler has a low phase noise of -111.67 dBc/Hz at a 1-MHz offset frequency is measured, which is 7 dB higher than a phase noise of the QVCO. The doubler can be tuned between 19.8-22 GHz and the output is -6.83 dBm. A fourth-order frequency multiplier, which is used to obtain 40-GHz outputs, shows a phase noise of -102.0 dBc/Hz at 1-MHz offset frequency with the output power of -18.0 dBm. A large tuning range of 39.3-43.67 GHz (10%) is observed.

Original languageEnglish
Pages (from-to)2789-2800
Number of pages12
JournalIEEE Transactions on Microwave Theory and Techniques
Volume53
Issue number9
DOIs
Publication statusPublished - 2005 Sep

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'K- and Q-bands CMOS frequency sources with X-band quadrature VCO'. Together they form a unique fingerprint.

  • Cite this