Low Phase Noise, 18 kHz Frequency Tuning Step, 5 GHz, 15 bit Digitally Controlled Oscillator in 0.18 .MU.m CMOS Technology

• POKHAREL Ramesh K.

  Kyushu University

• UCHIDA Kenta

  Kyushu University

• TOMAR Abhishek

  Kyushu University

• KANAYA Haruichi

  Kyushu University

• YOSHIDA Keiji

  Kyushu University

Abstract

A method to realize the fine frequency-tuning steps using tiny capacitors instead of Metal-Insulator-Metal (MIM) capacitors is proposed for a digitally controlled oscillator (DCO). The tiny capacitors are realized by the coplanar transmission lines which are arranged unsymmetrical in a 6 metal layers (M6) foundry of 0.18µm CMOS technology. These transmission line based capacitors are designed by using electro-magnetic field simulator, and co-designed by using SPICE simulator. Finally, these capacitors are employed to design 15bit DCO and fabricated the proposed DCO in 0.18µm CMOS technology, and tested. The measured phase noise of DCO was -118.3dBc/Hz (@1MHz offset frequency), and the oscillating frequency tuned from 4.86GHz to 5.36GHz in the minimum frequency-tuning step of 18kHz.

Journal

• IEICE Transactions on Electronics

  IEICE Transactions on Electronics E93-C (7), 1007-1013, 2010

  The Institute of Electronics, Information and Communication Engineers

Keywords

• digitally controlled oscillator
• tiny capacitor
• phase noise
• frequency tuning step
• 5-GHz-band wireless LAN
• 0.18
• µm CMOS

Details

• CRID: 1390282679352769408
• NII Article ID: 10027365258
• NII Book ID: AA10826283
• DOI: 10.1587/transele.e93.c.1007
• ISSN: 17451353
• ISSN: 09168524
• Web Site: http://www.jstage.jst.go.jp/article/transele/E93.C/7/E93.C_7_1007/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed