By Topic

An RC time constant auto-tuning structure for high linearity continuous-time ΣΔ modulators and active filters

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
$31 $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

3 Author(s)
Bo Xia ; Electr. Eng. Dept., Texas A&M Univ., College Station, TX, USA ; Shouli Yan ; Sanchez-Sinencio, E.

An automatic RC time constant tuning scheme is proposed for high linearity continuous-time gm-C and active RC circuits in a low power consumption environment. Instead of changing the gm (in gm-C filters), the RC time constant is tuned by discretely varying the integration capacitors to preserve a high linearity. The auto-tuning circuit, consisting of an analog integrator, a voltage comparator, and a digital tuning engine, generates a control word and sets on-chip capacitors to obtain an RC time-constant accuracy of ±2-10%. The proposed scheme is verified by the experimental results of a test chip in a 0.5 μm CMOS technology. It achieves a peak S/(N+D) of 83 dB while a tuning range of over ±40% is accomplished.

Published in:

Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:51 ,  Issue: 11 )