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Proceedings Paper

A new method to determine the period in sigma delta modulator with DC input
Author(s): Lijun Cao
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Paper Abstract

Sigma delta modulator was used as A/D converter in many applications. By calculating 1-bit data stream directly in a period has high resolution with short time. According to the periodic characters of the output bit string in sigma delta modulator with DC rational input, a new method based on the correlation analysis was given to fix the period of output bit string. Assuming the output 1-bit data stream in a sigma delta modulator is y(n), considering the output series y(n) of finite length, its autocorrelation function ryy(0) (when m=0) is maximum. Calculating autocorrelation function ryy(m)continuously until m=T, when ryy(T)= ryy(0), T is the cycle period. By averaging y(n) in T interval can obtain corresponding input level value. Any DC input signals can be regard as a rational based on the system precision, the period T was obtained from the modulator output and is independent of the initial condition, so the method has important significance in practical application.

Paper Details

Date Published: 20 February 2006
PDF: 6 pages
Proc. SPIE 6041, ICMIT 2005: Information Systems and Signal Processing, 60411A (20 February 2006); doi: 10.1117/12.664328
Show Author Affiliations
Lijun Cao, Hefei Univ. of Technology (China)
Shandong Univ. (China)


Published in SPIE Proceedings Vol. 6041:
ICMIT 2005: Information Systems and Signal Processing

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