Title :
Direct conversion using lowpass sigma-delta modulation
Author :
Eerola, Ville ; Lampinen, Harri ; Ritoniemi, Tapani ; Tenhunen, Hannu
Author_Institution :
Signal Process. Lab., Tampere Univ. of Technol., Finland
Abstract :
A method for quadrature demodulation by subsampling with sigma-delta analog-to-digital converters is discussed, and a correlator receiver structure based on this method is described. The almost completely digital demodulator structure is based on second-order sampling and sigma-delta analog-to-digital converters. A theoretical performance analysis is presented, and a measurement system for the method is described. The proposed structure can be implemented on a single integrated circuit
Keywords :
analogue-digital conversion; correlators; delta modulation; demodulation; digital communication systems; receivers; ADC; correlator receiver structure; digital demodulator; direct conversion; lowpass sigma-delta modulation; measurement system; performance analysis; quadrature demodulation; second-order sampling; single integrated circuit; subsampling; Analog-digital conversion; Band pass filters; Delta-sigma modulation; Demodulation; Digital filters; Digital modulation; Frequency conversion; Frequency domain analysis; Robustness; Sampling methods;
Conference_Titel :
Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0593-0
DOI :
10.1109/ISCAS.1992.230675
