Title :
A 5,sup>th-order CT/DT Multi-Mode ΔΣ Modulator
Author_Institution :
NXP Semicond., Zurich
Abstract :
A 5th-order CT/DT multi-mode ΔΣ ADC for the digitisation of baseband signals is presented. For accurate loop characteristics, the design uses DT switched-capacitor OTAs for the second- to fifth-stage integrators while the CT first-stage integrator provides anti-alias filtering. Implemented in 65nm CMOS, the design achieves 88/82/73dB DR for EDGE/CDMA/UMTS and draws < 1.5mA from a 2.5V supply.
Keywords :
3G mobile communication; CMOS integrated circuits; delta-sigma modulation; integrating circuits; operational amplifiers; switched capacitor networks; 2.5 V; CDMA; CMOS; EDGE; UMTS; anti-alias filtering; baseband signals digitisation; integrators; loop characteristics; multimode delta-sigma modulator; switched-capacitor OTA; 3G mobile communication; Baseband; Capacitors; Clocks; Communication standards; Feedback; Filters; Frequency; Multiaccess communication; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 2007. ISSCC 2007. Digest of Technical Papers. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0852-0
Electronic_ISBN :
0193-6530
DOI :
10.1109/ISSCC.2007.373385
