Title :
Fast-settling amplifier design using feedforward compensation technique
Author :
Yan, Jie ; Geiger, Randall L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
A new feedforward compensation amplifier architecture that provides very fast settling performance is introduced. The additional feedforward path introduces zeros in the open-loop transfer function which can be used to shape the overall frequency response. It is shown that a second-order bandpass feedforward path is useful for extending the unity-gain-frequency of the overall amplifier. By choosing the proper gain, center frequency, and Q factor of the bandpass filter, the pole and zeros of the amplifier can be placed on top of each other thus eliminating the slow-settling component inherent in many feedforward compensation schemes. Simulation results of closed-loop amplifiers showing substantial improvements in rise time and settling behavior are presented
Keywords :
Q-factor; band-pass filters; closed loop systems; compensation; feedforward; frequency response; operational amplifiers; poles and zeros; transfer functions; Q-factor; amplifier design; center frequency; closed-loop amplifier; feedforward compensation technique; frequency response; gain; open-loop transfer function; operational amplifier; poles and zeros; rise time; second-order bandpass filter; settling time; unity-gain-frequency; Band pass filters; Bandwidth; Computer architecture; Filtering theory; Frequency response; Operational amplifiers; Poles and zeros; Q factor; System performance; Transfer functions;
Conference_Titel :
Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on
Conference_Location :
Lansing, MI
Print_ISBN :
0-7803-6475-9
DOI :
10.1109/MWSCAS.2000.951691
