Title :
Digitally tuned bandpass sigma delta modulator for wireless communications
Author :
Hezar, Rahmi ; Altun, Oguz
Author_Institution :
Wireless Analog Technol. Center, Texas Instrum. Inc., Dallas, TX, USA
Abstract :
An 80 MHz, 3-level output, bandpass sigma delta modulator analog to digital converter (ADC) with complete digital tuning is presented. The proposed architecture is based on error feedback mechanism with a 64-level flash ADC, and a 3-level DAC in the loop. It yields almost constant SNR for programmable signal band that can be placed anywhere in the 2 to 38MHz band.
Keywords :
band-pass filters; circuit feedback; circuit tuning; error analysis; programmable circuits; radio receivers; sigma-delta modulation; 2 to 38 MHz; 80 MHz; ADC architecture; analog to digital converter; constant SNR; digital tuning; digitally tuned bandpass sigma delta modulator; error feedback mechanism; flash ADC; programmable signal band; three-level DAC; wireless communications; Analog-digital conversion; Delta modulation; Delta-sigma modulation; Digital modulation; Feedback; Noise shaping; Switches; Transfer functions; Tunable circuits and devices; Wireless communication;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465425
