Title :
A high-drive high-gain CMOS current operational amplifier
Author :
Palmisano, G. ; Palumbo, G. ; Pennisi, S.
Author_Institution :
Dipt. Elettrico, Elettronico e Sistemistico, Catania Univ., Italy
Abstract :
A novel single-input differential-output CMOS current operational amplifier is presented which provides high gain and high drive capability. The amplifier is designed with a 1.2-μm CMOS technology, uses a 5 V power supply and dissipates a dc power less than 3 mW. Moreover, it exhibits an open-loop gain of 90 dB and a gain-bandwidth of 11 MHz. Thanks to the use of a novel class AB output stage, the proposed amplifier is able to drive a load resistance of 100 Ω with a maximum bipolar output current of about 15 mA, being the quiescent current in the output branch of only 140 μA. Finally, because of its symmetrical topology, the amplifier is also well suited to be arranged in a fully-differential version
Keywords :
CMOS analogue integrated circuits; differential amplifiers; integrated circuit design; operational amplifiers; CMOS; bipolar output current; class AB output stage; current operational amplifier; dc power; drive capability; fully-differential version; gain-bandwidth; load resistance; open-loop gain; quiescent current; single-input differential-output amplifier; symmetrical topology; CMOS technology; Differential amplifiers; Equivalent circuits; Gain; Mirrors; Operational amplifiers; Power amplifiers; Power supplies; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704491
