By Topic

Digitally controlled CMOS quadrature ring oscillator with improved FoM for GHz range all-digital phase-locked loop applications

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
R. K. Pokharel ; EJUST Center, Kyushu University, Fukuoka 819-0395, Japan ; P. Nugroho ; A. Anand ; K. Kanaya
more authors

This paper presents a 14-bit digitally controlled ring oscillator (DCO) with operating frequency up to 3.4 GHz in 0.18 µm CMOS technology. Digital control is employed to control the transistor operation to obtain higher voltage swing and lower flicker (1/f) noise that in turn results in the lowest phase noise in a ring oscillator. Furthermore, sub-feedback topology is used to obtain the stable quadrature outputs from even number of stages. The DCO has a frequency tuning from 523 MHz to 3.405 GHz. Phase noise at 4 MHz offset is −134.82 dBc/Hz. This results in figure of merit (FoM) to be −169.9 dBc/Hz which is 7.7 dB improvement over its recently published analog counterpart.

Published in:

Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International

Date of Conference:

17-22 June 2012