Title :
An Elaborate Design and Optimization of Low Order Bandpass Sigma-Delta Modulator
Author :
Torkzadeh, Pooya ; Tajalli, Armin ; Atarodi, M.
Author_Institution :
SICAS Group, EE Dept., Sharif U. of T., Tehran
Abstract :
This paper presents an elaborate plan and optimization method for designing and implementing low-order band pass digital sigma-delta modulator with high order output dynamic range (DR). The noise suppression in the pass band region of the modulator and high order output DR would be achieved by designing and optimizing the Noise Transfer Function (NTF) based on over sampling ratio (OSR) and desired modulator operational frequency and designing the Signal Transfer Function (STF) by the mean which the optimum gain in desired frequency would be acquired. Designed and optimized modulator has been implemented completely on digital circuits and it would be shown that the first order designed modulator has the output dynamic range of 90dB which corresponds to 15 bits data conversion. Results from various simulations illustrate both the stability and high performance of the design and flexibility of the overall structure.
Keywords :
Bandpass Sigma-Delta Modulator; Modulator Stability and Implementation on Digital Circuits; Noise Suppression; Output Dynamic Range; Delta-sigma modulation; Design methodology; Design optimization; Digital modulation; Dynamic range; Frequency; Optimization methods; Signal design; Signal to noise ratio; Transfer functions; Bandpass Sigma-Delta Modulator; Modulator Stability and Implementation on Digital Circuits; Noise Suppression; Output Dynamic Range;
Conference_Titel :
Microelectronics, 2005. ICM 2005. The 17th International Conference on
Print_ISBN :
0-7803-9262-0
DOI :
10.1109/ICM.2005.1590025
