By Topic

Design and implementation of a tunable 40 MHz-70 MHz Gm-C bandpass ΔΣ modulator

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

2 Author(s)
O. Shoaei ; Bell Labs, Lucent Technol., Allentown, PA, USA ; W. M. Snelgrove

The discrete-time ΔΣ modulator is transformed to the continuous-time ΔΣ modulator. For either nonreturn to-zero or return to-zero feedback, the loop transfer functions of the continuous-time and discrete-time modulators can be made exactly equivalent. Hence, a stable discrete-time ΔΣ modulator is mapped to a stable continuous-time ΔΣ modulator having the same SNR. The anti-alias (image rejection) properties of the continuous-time modulator are described. Experimental results for a tunable 40 MHz-70 MHz continuous-time Gm-C modulator are shown to verify the theory. A master-slave tuning scheme is developed to tune the Gm-C ΔΣ loop filter

Published in:

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing  (Volume:44 ,  Issue: 7 )