Title :
A CMOS current-mode operational amplifier
Author :
Kaulberg, Thomas
Author_Institution :
Electron. Inst., Tech. Univ. of Denmark, Lyngby, Denmark
fDate :
7/1/1993 12:00:00 AM
Abstract :
A fully differential-input, differential-output, current-mode operational amplifier (COA) is described. The amplifier utilizes three second-generation current conveyors (CCIIs) as the basic building blocks. It can be configured to provide either a constant gain-bandwidth product in a fully balanced current-mode feedback amplifier or a constant bandwidth in a transimpedance feedback amplifier. The amplifier is found to have a gain-bandwidth product of 3 MHz, an offset current of 0.8 μA (signal range ±700 μA), and a (theoretically) unlimited slew rate. The amplifier is realized in a standard CMOS 2.4-μm process
Keywords :
CMOS integrated circuits; differential amplifiers; feedback; linear integrated circuits; operational amplifiers; 0.8 muA; 2.4 micron; CCIIs; CMOS; constant bandwidth; constant gain-bandwidth product; current-mode; differential-input; differential-output; monolithic type; op amp; operational amplifier; second-generation current conveyors; transimpedance feedback amplifier; Bandwidth; CMOS process; Current mode circuits; Differential amplifiers; Feedback amplifiers; Helium; Impedance; Operational amplifiers; Transfer functions; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
