Title :
A new design topology for low-voltage CMOS current feedback amplifiers
Author :
Maundy, Brent J. ; Sarkar, Ataur R. ; Gift, Stephan J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Calgary
Abstract :
A new topology for designing low-voltage current feedback amplifiers (CFAs) is presented. By employing a second-generation positive current conveyor followed by an operational amplifier in an unconventional manner, the design circumvents the problem of trying to achieve large transimpedance in a low-voltage environment. It is shown that this CFA configuration also results in near gain independent closed-loop bandwidth defined by a single feedback resistor. The proposed amplifier was verified experimentally by a chip designed using Taiwan Semiconductor Manufacturing Company´s 0.18-mum digital CMOS process of a single-ended power supply of 1.8 V
Keywords :
CMOS digital integrated circuits; current conveyors; current-mode circuits; feedback amplifiers; integrated circuit design; low-power electronics; operational amplifiers; 0.18 micron; 1.8 V; current feedback amplifiers; digital CMOS process; feedback resistor; low-voltage amplifiers; operational amplifier; second-generation positive current conveyor; Bandwidth; CMOS process; Feedback amplifiers; Manufacturing processes; Operational amplifiers; Power amplifiers; Resistors; Semiconductor device manufacture; Semiconductor optical amplifiers; Topology; Current feedback amplifier (CFA); low-voltage operational amplifier;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2005.855731
