Title :
Fully differential floating-gate programmable OTAs with novel common-mode feedback
Author :
Chawla, Ravi ; Serrano, Guillermo ; Allen, Daniel J. ; Pereira, Angelo W. ; Hasler, Paul E.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
This paper describes two floating-gate OTAs (FG-OTAs). The OTAs have a pFET input stage and employ current mirror topology. A floating-gate (FG) common-mode feedback (CMFB) circuit as well as a conventional CMFB circuit is described for use with these OTAs. Their performance is compared. Expressions are derived for the differential and common-mode frequency-response of the OTAs. Typical simulation and experimental results are shown for prototypes fabricated in a 0.5μm CMOS process available through MOSIS. The prototype operate from a single 3.3V supply with typical bias currents in the 10-100 nA range. A second order Gm-C filter section was built from these OTAs and the experimental results are presented.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; feedback amplifiers; operational amplifiers; programmable circuits; 0.5 micron; 10 to 100 nA; 3.3 V; CMOS process; MOSIS; common-mode feedback circuit; common-mode frequency response; current mirror topology; differential frequency response; floating-gate programmable OTA; operational transconductance amplifier; pFET input stage; second order Gm-C filter section; CMOS process; Circuit simulation; Circuit topology; Feedback circuits; Filters; Frequency response; Mirrors; Prototypes; Transconductance; Virtual prototyping;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328320
