Title :
A low-power ΔΣ modulator with low capacitor spread for multi-standard receiver applications
Author :
Zahabi, A. ; Shoaei, O. ; Koolivand, Y. ; Jabehdar-Maralani, P.
Author_Institution :
ECE Dept., Tehran Univ., Iran
Abstract :
A new approach for obtaining the optimum coefficients of a switched capacitor delta-sigma (SC ΔΣ) modulator for multi-standard GSM/UMTS applications using power and maximum capacitor spread constraints is developed. A modulator with 89dB/60dB DR and 4.5mW/7mW power consumption at 0.2MHz/2MHz bandwidth of GSM/UMTS standards has been designed in a 0.18μm, 1.8V 1P6M CMOS process to be used in the baseband of a low-IF (LIF)/zero-IF (ZIF) receiver architecture. The maximum SNDR of the modulator in the presence of 1% mismatch between coefficients degrades less than 1dB.
Keywords :
3G mobile communication; CMOS integrated circuits; cellular radio; delta-sigma modulation; radio receivers; switched capacitor networks; 0.18 micron; 0.2 MHz; 1.8 V; 2 MHz; 4.5 mW; 7 mW; CMOS process; GSM/UMTS applications; LIF/ZIF receiver; SNDR; baseband; capacitor spread; low-IF/zero-IF receiver; low-power ΔΣ modulator; multi-standard receiver; optimum coefficients; switched capacitor modulator; 3G mobile communication; Band pass filters; Bandwidth; Baseband; Degradation; Digital filters; Dynamic range; Energy consumption; GSM; Power capacitors;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465285
