By Topic

An almost leakage free method for assessing Σ-Δ modulator spectra

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)
A. Breitenbach ; Lehrstuhl fur Elektrische Messtech., Tech. Univ. Munchen, Germany ; I. Kale

This paper addresses the problem of spectral analysis of Σ-Δ modulator output spectra. Often, data containing a periodic signal are evaluated using fast-Fourier-transform (FFT) based spectral analysis. If the data set is not sampled coherently, long- and short-range leakage can hamper or prevent the frequency domain analysis, particularly if frequencies near the excitation sine frequency are of interest. Techniques such as windowing or coherent sampling help, but unfortunately may add their own effects to the spectra under scrutiny. Where coherent sampling is not easily possible, another approach to reliable spectrum analysis is a hybrid computation of the spectrum using the output bit stream from a Σ-Δ modulator. This will yield spectral information and an assessment of modulator performance. The method is demonstrated on MATLAB simulated Σ-Δ modulator bit-stream data from a single-loop, first order modulator as well as a single-loop, third order modulator, both excited by a multitone sinusoidal excitation

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:47 ,  Issue: 1 )