Title :
Programmable IIR filter using bitstream processing
Author :
Leme, C. Azeredo ; Fernandes, L. ; Franca, J.
Author_Institution :
Grupo de Circuitos e Sistemas Integrados, Inst. Superior Tecnico, Lisbon, Portugal
Abstract :
This paper presents a compact CMOS realization of cascaded biquad digital filters using 2nd order ΔΣ modulators requiring no multibit multiplier. A bitstream biquad is derived with just one ΔΣ modulator for each pair of poles which leads to a very compact implementation. No significant degradation of sensitivity nor of dynamic range is observed. The analog interfaces are highly simplified due to the bitstream input and output formats
Keywords :
CMOS digital integrated circuits; IIR filters; VLSI; cascade networks; digital filters; programmable filters; sigma-delta modulation; 0.5 micron; 2nd order ΔΣ modulators; bit stream biquad; bitstream processing; cascaded biquad digital filters; compact CMOS realization; delta-sigma modulator; programmable IIR filter; second-order modulator; Circuits; Delay; Digital filters; Digital modulation; Digital signal processing; Dynamic range; Filtering; IIR filters; Interpolation; Modulation coding; Multiplexing;
Conference_Titel :
Analog and Mixed IC Design, 1996., IEEE-CAS Region 8 Workshop on
Conference_Location :
Pavia
Print_ISBN :
0-7803-3625-9
DOI :
10.1109/AMICD.1996.569399
