By Topic

Frequency and Q tuning techniques for continuous-time bandpass sigma-delta 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
$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

2 Author(s)
Huanzhang Huang ; Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA ; Lee, E.K.F.

For continuous-time (CT) sigma-delta modulator, degradations in SNR can be caused by the non-idealities and variations of circuit components such as integrators, resistors and capacitors since the center frequency and/or the Q-factor of the CT filter in the modulator can vary significantly due to temperature and process variations. Thus tuning is necessary especially for high order modulator. In this paper, a direct background digital frequency technique and a direct background digital Q-factor tuning technique are proposed. Both techniques measure the noise spectral densities of the modulator output digitally during normal operation and adjust the tuning codes according to the measured spectral densities. No extra ADC or DAC are required.

Published in:

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on  (Volume:5 )

Date of Conference: