Title :
Fourth order sigma-delta modulator circuit for digital audio and ISDN applications
Author :
Karema, T. ; Ritoniemi, T. ; Tenhunen, H.
Author_Institution :
Tampere Univ. of Technol., Finland
Abstract :
A fourth order switched capacitor sigma-delta modulator architecture is presented providing extremely high signal to quantization noise ratio with modest circuit level demands for digital audio specification. Tolerable nonidealities in subcircuits are specified by system level simulation. The subcircuits are designed to fulfil the digital audio specification. Five modulators are fabricated in order to investigate the 1/f-noise elimination
Keywords :
ISDN; analogue-digital conversion; cascade networks; delta modulation; digital audio tape; interference suppression; modems; modulators; switched capacitor networks; 1/f-noise elimination; ADC; DAT; ISDN applications; cascaded second order modulators; digital audio; fourth order SC architecture; sigma-delta modulator circuit; signal/quantization noise ratio; switched capacitor; system level simulation;
Conference_Titel :
Circuit Theory and Design, 1989., European Conference on
Conference_Location :
Brighton
