Error-feedback for amplifier linearization
Date
1998
Authors
Meier I.
De Swardt J.B.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
A novel general linearization topology called `Error-Feedback' is presented and applied to the linearization of amplifiers. Error-Feedback uses the difference/error between (linearly) scaled input and output signal in its feedback loop to reduce non-linearity. It does not rely on main-amplifier gain for linearization as does traditional feedback. Instead an auxiliary amplifier is introduced into the feedback loop, leaving the main amplifier's linear gain unaffected. Results from theory, simulation as well as measured results complement each other. They show that linearization takes place over a continuous band. The topology shows prospects for concurrent multi-band linearization. Internal delay and phase shifts influence design limits and overall performance.
Description
Keywords
Computer simulation, Error analysis, Feedback, Linearization, Topology, Concurrent multiband linearization, Microwave amplifiers
Citation
Proceedings of the South African Symposium on Communications and Signal Processing, COMSIG