Title :
Intermodulation in sigma-delta D/A converters
Author :
Karema, Teppo ; Ritoniemi, Tapani ; Tenhunen, Hannu
Author_Institution :
Signal Process. Lab., Tampere Univ. of Technol., Finland
Abstract :
A novel model for the quantization noise modulation to the baseband is proposed and analyzed. It is shown that the quantization noise intermodulation is independent of the input signal level for practical oversampling ratios. The intermodulation is caused by the nonlinearities of the sample and hold device in the 1-bit D/A. Useful equations for estimating the modulating quantization noise in the baseband from measurable parameters are presented. Several circuit considerations are discussed to reduce the unwanted effects of the nonlinearities
Keywords :
delta modulation; digital-analogue conversion; intermodulation; modulators; random noise; 1 bit; baseband noise; intermodulation; oversampling ratios; quantization noise modulation; sample and hold device nonlinearities; sigma-delta D/A converters; Baseband; Circuit noise; Delta-sigma modulation; Filters; Noise level; Noise shaping; Quantization; Signal processing; Signal to noise ratio; Voltage;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176694
