Negative Feedback, Linearity and Parameter Invariance in Linear Electronics
| Autor: | Cesar H. Comin, Luciano da F. Costa, Filipi N. Silva |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Physics - Instrumentation and Detectors FOS: Physical sciences 02 engineering and technology Transfer function law.invention 03 medical and health sciences 020901 industrial engineering & automation 0302 clinical medicine SEMICONDUTORES law Linearization Control theory Negative feedback Electronics Electrical and Electronic Engineering Mathematics Signal processing Applied Mathematics Transistor Linearity Instrumentation and Detectors (physics.ins-det) Uniformization (probability theory) Physics - Data Analysis Statistics and Probability 030217 neurology & neurosurgery Data Analysis Statistics and Probability (physics.data-an) |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| DOI: | 10.48550/arxiv.1611.06356 |
| Popis: | Negative feedback is a powerful approach capable of improving several aspects of a system. In linear electronics, it has been critical for allowing invariance to device properties. Negative feedback is also known to enhance linearity in amplification, which is one of the most important foundations of linear electronics. At the same time, thousands of transistors types have been made available, suggesting that these devices, in addition to their known variability of parameters, have distinguishing properties. The current work reports a systematic approach to quantifying the potential of negative feedback, with respect to bipolar transistors, as a means to providing device invariance and linearity. Several methods, including concepts from multivariate statistics and complex systems, are applied at the theoretical as well as experimental levels, and a number of interesting results are obtained and discussed. For instance, it has been verified that the transistors types indeed have well-defined characteristics which clearly segregate them into groups. The addition of feedback at moderate and intense levels promoted uniformization of the properties of these transistors when used in a class A common emitter configuration. However, such effect occurred with different efficiency regarding the considered device features, and even intense feedback was unable to completely eliminate device dependence. This indicates that it would be interesting to consider the device properties in linear design even when negative feedback is applied. We also verified that the linearization induced in the considered experiments is relatively modest, with effects that depend on type of transfer function of the original devices. |
| Databáze: | OpenAIRE |
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