Title :
Equivalent gain analysis for nonlinear operational amplifiers
Author :
Chengming He ; Hanjun Jiang ; Degang Chen ; Geiger, Richard
Author_Institution :
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
For low-voltage, low-power circuit design, the linear model for operational amplifiers is insufficient to accurately predict the static and dynamic behavior of the circuit. This paper introduces a nonlinear model for operational amplifiers based on amplifiers´ DC transfer characteristic. By using this nonlinear model, the behavior of an operational amplifier with feedback network can be described more accurately. Equivalent open-loop gains of the operational amplifier for several common closed-loop applications are studied. These equivalent gains can help identify the nonlinearities in the close-loop amplifier and determine the performance of the circuit.
Keywords :
feedback amplifiers; low-power electronics; nonlinear network analysis; operational amplifiers; DC transfer characteristics; close-loop amplifier; equivalent gain analysis; feedback network; low-voltage low-power circuit design; nonlinear model; open-loop gain; operational amplifier; Circuit synthesis; Feedback; Helium; Low voltage; Nonlinear equations; Operational amplifiers; Performance gain; Predictive models; Semiconductor optical amplifiers; Signal analysis;
Conference_Titel :
Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on
Print_ISBN :
0-7803-7523-8
DOI :
10.1109/MWSCAS.2002.1187166