Title :
A high gain current-mode operational amplifier
Author :
Zele, Rajesh H. ; Lee, Sang-Soo ; Allstot, David J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
Inaccurate open-loop current gain is a limitation of current-mode circuits. The authors proposed a current-mode operational amplifier (I-opamp) with high open-loop gain that provides accurate closed-loop current-gain characteristics. Negative feedback around the high-gain I-opamp produces an accurate closed-loop current gain insensitive to process, supply, and temperature variations. An analysis of the I-opamp is presented along with possible applications. A topology for a high-gain current-mode differential operational amplifier has been developed and implemented in a 2-μm n-well CMOS process
Keywords :
CMOS integrated circuits; differential amplifiers; feedback; operational amplifiers; 2 micron; closed-loop current-gain characteristics; current-mode operational amplifier; differential operational amplifier; n-well CMOS process; negative feedback; open-loop current gain; topology; BiCMOS integrated circuits; Broadband amplifiers; Current mode circuits; Impedance; MOSFETs; Mirrors; Negative feedback; Operational amplifiers; Temperature; Voltage;
Conference_Titel :
Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0593-0
DOI :
10.1109/ISCAS.1992.230605
