This paper explores and presents the possible approaches to the design of a low-voltage operational transconductance amplifier (OTA) using the bulk-driven technique. The design of a 0.8 V fully differential folded-cascode OTA using a 0.35 /spl mu/m CMOS technology having a threshold voltage of 0.6 V is presented. This OTA utilizes bulk-driven differential-pairs to achieve rail-to-rail input operation, and gate- and bulk-biased cascode transistors to increase the output resistance. A continuous-time common-mode feedback (CMFB) is used for this OTA, which implements the bulk-driven differential pairs to sense the common-mode voltage smaller than the transistor's threshold voltage, as well as bulk-driven current mirrors to reduce voltage headroom consumption. This OTA has been designed using Alcatel's 0.35 /spl mu/m twin-well CMOS technology, and the simulation results indicate an open-loop gain>60 dB, unity gain-bandwidth=3.4 MHz with a 5 pF load, and an input common mode range (ICMR) of 0.8 V.
[1]
Gabriel A. Rincon-Mora,et al.
Designing 1-V op amps using standard digital CMOS technology
,
1998
.
[2]
Eby G. Friedman,et al.
A 0.8 volt high performance OTA using bulk-driven MOSFETs for low power mixed-signal SOCs
,
2003,
IEEE International [Systems-on-Chip] SOC Conference, 2003. Proceedings..
[3]
Sudhanshu Shekhar Jamuar,et al.
Low voltage analog circuit design techniques
,
2002
.
[4]
B. Dufrene,et al.
Complementary body driving - a low voltage analog circuit technique for SOI
,
2002,
2002 IEEE International SOI Conference.
[5]
P. E. Allen,et al.
Low-voltage, supply independent CMOS bias circuit
,
2002,
The 2002 45th Midwest Symposium on Circuits and Systems, 2002. MWSCAS-2002..
[6]
Phillip E Allen,et al.
CMOS Analog Circuit Design
,
1987
.