An ultra-low-voltage ultra-low-power OTA with improved gain-bandwidth product

A 0.5-V ultra-low-power improved operational transconductance amplifier (OTA) using the transistors operate in weak inversion is presented in this paper. The proposed topology based on a bulk-driven input differential pair employed a gain-stage in the Miller capacitor feedback path to improve the ¿pole-splitting¿ effect. Simulations in a standard 0.18 ¿m CMOS process resulted on rail-to-rail input and output swings, considerable enhancement in unity-gain bandwidth and also the DC gain with the power consumption of only 1.02 ¿W.

[1]  Jose L. Ausin,et al.  Constant-g/sub m/ constant-slew-rate high-bandwidth low-voltage rail-to-rail CMOS input stage for VLSI cell libraries , 2003 .

[2]  Hirokazu Yoshizawa,et al.  A 0.9 V, 0.51 /spl mu/A rail-to-rail CMOS operational amplifier , 2001, Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169).

[3]  Marc Pastre,et al.  CMOS Analog Circuits Design Educational Tool , 2004 .

[4]  H. Yoshizawa,et al.  A 0.9-V 0.5-μA rail-to-rail CMOS operational amplifier , 2001, IEEE J. Solid State Circuits.

[5]  Jaime Ramirez-Angulo,et al.  Low-voltage CMOS operational amplifiers with wide input-output swing based on a novel scheme , 2000 .

[6]  William Redman-White.  A high bandwidth constant g/sub m/ and slew-rate rail-to-rail CMOS input circuit and its application to analog cells for low voltage VLSI systems , 1997 .

[7]  Robson L. Moreno,et al.  An Ultra-Low-Voltage Ultra-Low-Power CMOS Miller OTA With Rail-to-Rail Input/Output Swing , 2007, IEEE Transactions on Circuits and Systems II: Express Briefs.

[8]  Gabriel A. Rincon-Mora,et al.  Designing 1-V op amps using standard digital CMOS technology , 1998 .

[9]  B.K. Ahuja,et al.  An improved frequency compensation technique for CMOS operational amplifiers , 1983, IEEE Journal of Solid-State Circuits.

[10]  Guido Torelli,et al.  1-V Rail-to-Rail CMOS OpAmp With Improved Bulk-Driven Input Stage , 2007, IEEE Journal of Solid-State Circuits.

[11]  George Azzopardi,et al.  A Low Voltage Wide-Input-Range Bulk-Input CMOS OTA , 2005 .

[12]  Chenming Hu,et al.  MOSFET Modeling & BSIM3 User’s Guide , 1999 .

[13]  P. Kinget,et al.  0.5-V analog circuit techniques and their application in OTA and filter design , 2005, IEEE Journal of Solid-State Circuits.

[14]  Johan H. Huijsing,et al.  Low-voltage operational amplifier with rail-to-rail input and output ranges , 1989 .