Experimental evaluation of computer-controlled variable gain analog amplifiers
| Autor: | Ryan Schindeler, Keyvan Hashtrudi-Zaad, Daniel Cleveland |
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| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Open-loop gain Engineering Amplifier figures of merit business.industry Amplifier 020208 electrical & electronic engineering Operational amplifier applications 02 engineering and technology Fully differential amplifier Analog multiplier Surfaces Coatings and Films 020901 industrial engineering & automation Hardware_GENERAL Hardware and Architecture Signal Processing 0202 electrical engineering electronic engineering information engineering Electronic engineering Instrumentation amplifier Direct-coupled amplifier business |
| Zdroj: | Analog Integrated Circuits and Signal Processing. 86:449-458 |
| ISSN: | 1573-1979 0925-1030 |
| Popis: | Analog amplifiers are used as front-end electronics to pre-condition signals or for control applications where low latency matters. Highly dynamic systems such as adaptive analog filters or simulation of dynamic virtual environments in haptic systems, require amplification gain adjustment which can be digitally implemented. In this article, we will present and experimentally evaluate five digitally controlled variable gain analog amplifiers which use dedicated components, including multiplier amplifier, voltage controlled amplifier and digital potentiometer, or use low-cost JFET-based alternatives. The amplifiers are designed for the high amplitude, low frequency signals often found in control systems. A method of interfacing the amplifiers with a desktop computer is discussed. The performance of these amplifiers are compared for their gain linearity, zero command gain, gain symmetry, DC offset, bandwidth, and noise. While each amplifier displayed strength in some aspects, the best performing amplifier had a maximum gain error of 0.043 %, a symmetry error of 0.42 % and a DC offset of 0.026 V. Recommendations for the use of each amplifier are provided. |
| Databáze: | OpenAIRE |
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