Title :
Effects of open-loop nonlinearity on linearity of feedback amplifiers
Author :
Tang, Yonghui ; Geiger, Randall L.
Author_Institution :
Dept. of Electr. Eng. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
A quantitative analysis of the effects of nonlinearity in an open loop amplifier on the linearity of negative feedback amplifiers is presented. Results show that the ratio of the open-loop nonlinearity (OLN) to the closed-loop nonlinearity (CLN) in the presence of varying amounts of secondand third-order nonlinearities in the open loop amplifier is quantified. Results show that for the same amount of nonlinearities in the open loop amplifier, the second-order nonlinearity is suppressed more through feedback than the third-order nonlinearity. The effect of high open loop gain on reducing the nonlinearities through negative feedback is limited
Keywords :
feedback amplifiers; harmonic analysis; nonlinear network analysis; high open loop gain; linearity; negative feedback amplifiers; open loop amplifier; open-loop nonlinearity effects; open-loop nonlinearity to closed-loop nonlinearity ratio; quantitative analysis; second order harmonics; second-order nonlinearities; third order harmonics; third-order nonlinearities; Feedback amplifiers; Feedback circuits; Feedback loop; Harmonic distortion; Linearity; Negative feedback; Negative feedback loops; Nonlinear equations;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010944
