Optimum Laguerre filter design technique for sigma-delta demodulators

Author

Abeysekera, Saman S. ; Yao, Xue

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

5

fYear

2000

fDate

2000

Firstpage

405

Abstract

As an alternative to conventional FIR filters, an optimal IIR filter architecture based on orthonormal Laguerre functions is proposed for Sigma-Delta (Σ-Δ) demodulators. A Laguerre IIR filter design methodology is presented via the optimization of a quadratic function subject to a linear and a quadratic constraint. An efficient procedure to perform the optimization is discussed. The proposed IIR filter is easy to implement because it needs only a small number of components and therefore well suited for VLSI implementations. The impact of the selection of filter pole on the filter stability and phase linearity is discussed. The robustness issue of the Laguerre IIR filter is also addressed

Keywords

IIR filters; VLSI; circuit optimisation; circuit stability; demodulators; digital filters; filtering theory; limit cycles; minimisation; pole assignment; sigma-delta modulation; Σ-Δ demodulators; IIR filter design methodology; VLSI implementation; filter pole selection; filter robustness; filter stability; linear constraint; optimal IIR filter architecture; optimization; optimum Laguerre filter design technique; orthonormal Laguerre functions; phase linearity; quadratic constraint; quadratic function; sigma-delta demodulators; Constraint optimization; Delta-sigma modulation; Demodulation; Design methodology; Design optimization; Finite impulse response filter; IIR filters; Linearity; Stability; Very large scale integration;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on

Conference_Location

Geneva

Print_ISBN

0-7803-5482-6

Type

conf

DOI

10.1109/ISCAS.2000.857457

Filename

857457