Low phase noise, 18 kHz frequency tuning step, 5 GHz, 15 bit digitally controlled oscillator in 0.18 æm CMOS technology

Ramesh K. Pokharel, Kenta Uchida, Abhishek Tomar, Haruichi Kanaya, Keiji Yoshida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

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 unsym-metrical in a 6 metal layers (M6) foundry of 0.18 μm CMOS technology. These transmission line based capacitors are designed by using electromagnetic field simulator, and co-designed by using SPICE simulator. Finally, these capacitors are employed to design 15 bit DCO and fabricated the proposed DCO in 0.18 μm CMOS technology, and tested. The measured phase noise of DCO was -118.3 dBc/Hz (@1 MHz offset frequency), and the oscillating frequency tuned from 4.86 GHz to 5.36 GHz in the minimum frequency-tuning step of 18 kHz.

Original languageEnglish
Pages (from-to)1007-1013
Number of pages7
JournalIEICE Transactions on Electronics
VolumeE93-C
Issue number7
DOIs
Publication statusPublished - Jul 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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