Title :
Design of a 0.9-V 5-MHz sampling frequency 120-µW 1-bit fourth-order feedforward Sigma-Delta modulator
Author :
Eid, El-Sayed ; Gaber, Wagdy M.
Author_Institution :
Electr. Eng. Dept., Alexandria Univ., Alexandria, Egypt
Abstract :
Design of a 0.9-V 5-MHz sampling frequency 120-μW 1-bit fourth-order feedforward sigma-delta modulator using a standard CMOS 130-nm technology is presented. Modifications to an OTA design to improve its GBW and slew rate are presented. The simulated GBW and slew rate of the modified OTA have increased to 200 MHz and 15 V/μs, respectively. Consequently, the modulator sampling frequency has increased to 5 MHz without significant increase of the average total power consumption, which is projected to be less than 120 μW.
Keywords :
CMOS integrated circuits; operational amplifiers; sampling methods; sigma-delta modulation; CMOS technology; GBW; feedforward sigma-delta modulator; frequency 200 MHz; frequency 5 MHz; gain-bandwidth product; modulator sampling frequency; operational transconductance amplifier; power 120 μW; size 130 nm; slew rate; voltage 0.9 V; Sigma-Delta; feedforward modulator;
Conference_Titel :
TENCON 2009 - 2009 IEEE Region 10 Conference
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-4546-2
Electronic_ISBN :
978-1-4244-4547-9
DOI :
10.1109/TENCON.2009.5395848
