Title :
A 2-path ΣΔ modulator for bandpass applications
Author :
Andre, Elisabeth ; Morche, Dominique ; Balestro, Freddy ; Senn, Patrice
Author_Institution :
CNET, Meylan, France
Abstract :
This article presents a low-power bandpass sigma-delta modulator using a multibit quantizer (9 levels) and switched-capacitor DAC. The circuit is being manufactured in the 0.5 μm CMOS technology to operate with a 3.3-ν power supply. The sampling frequency Fs=24.576 MHz has been chosen to be equal to 4 times the intermediate frequency fo=6.144 MHz. Computer simulations revealed a SNR=60 dB (10 bits) with a bandwith of 1.536 MHz, that is to say OSR=8. The power consumption is evaluated at 25 mW and the integration surface at about 2 mm2. The performance evaluation is based on the test results of a previous circuit designed on the same basis (a 1-bit 4th-order bandpass ΣΔ modulator)
Keywords :
CMOS integrated circuits; integrated circuit design; quantisation (signal); sigma-delta modulation; switched capacitor networks; 0.5 micron; 1.536 MHz; 24.576 MHz; 25 mW; 3.3 V; CMOS technology; bandpass sigma-delta modulator; integration surface; multibit quantizer; performance evaluation; power consumption; sampling frequency; switched-capacitor DAC; two-path ΣΔ modulator; Baseband; CMOS technology; Capacitors; Circuits; Delta modulation; Delta-sigma modulation; Demodulation; Frequency; Iron; Performance evaluation; Signal generators; Signal processing; Signal resolution;
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.1996.569392
