DocumentCode :
3010541
Title :
A comparison of various low-pass filter architectures for sigma-delta demodulators
Author :
Abeysekera, Saman S. ; Yao, Xue ; Zhuquan Zang
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Volume :
2
fYear :
1999
fDate :
36342
Firstpage :
380
Abstract :
A comparison of various low-pass filter architectures that are commonly used in Sigma-Delta(Σ-Δ) demodulators is presented in the paper. In this comparison the conventional demodulator filter architectures such as the optimal FIR filter, Sinck filter and non-linear Zoomer filter are considered. It is shown that the optimum FIR filter provides the most attractive properties among the conventional demodulator low-pass filters. As an alternative to the optimal FIR filter, optimal Laguerre IIR filter architecture is then proposed in the paper. A design scheme for the optimal IIR filter is presented via the use of orthonormal Laguerre functions. In comparison with the conventional FIR filter approach, this design offers several attractive features. The proposed IIR filter design problem is easy to solve and numerically robust. Furthermore, the optimal IIR filter is easy to implement because it needs only a small number of components and therefore well suited for VLSI implementations
Keywords :
FIR filters; IIR filters; VLSI; demodulators; digital filters; filtering theory; low-pass filters; nonlinear filters; sigma-delta modulation; Σ-Δ demodulators; Sinck filter; VLSI implementations; design scheme; low-pass filter architectures; nonlinear Zoomer filter; optimal FIR filter; optimal Laguerre IIR filter; orthonormal Laguerre functions; sigma-delta demodulators; Bandwidth; Delta-sigma modulation; Demodulation; Equations; Finite impulse response filter; Frequency; IIR filters; Low pass filters; Quantization; Very large scale integration;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
Type :
conf
DOI :
10.1109/ISCAS.1999.780738
Filename :
780738
Link To Document :
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