Analogue adaptive techniques for dynamic sensor frequency compensation
Analogue adaptive techniques for dynamic sensor frequency compensation
This research investigates the application of analogue adaptive techniques and their practical validation for dynamic sensor compensation, of which there is little reported work in the literature. This is illustrated by showing how the response of a load cell can be improved to speed up the measurement process. Since the load cell possesses an oscillatory output, in which the measured contributes to the response parameters, an adaptive compensation filter is needed to track variation in measurand of the load cell whereas a simple, fixed filter is only valid at one specific load value. Voltage-mode and current-mode analogue adaptive filters have been investigated and suitable circuit topologies have been identified with simple adaptation process and effective compensation.
To facilitate this investigation, computer models for the load cell and the adaptive compensation filter have been developed and circuit-level simulations of the models have been performed. To validate the models in practice, a discrete implementation of the analogue adaptive filter has been developed, in which a novel piecewise linearization technique has been proposed in order to vary a floating voltage-controlled resistor in a linear manner over a wide range. Simulation and practical results are presented, thus demonstrating the effectiveness of the analogue adaptive compensation method.
In order to develop an integrated implementation of the adaptive compensation filter compatible with a digital CMOS process, the switched-current (SI) technique has been investigated and a suitable SI based filter has been identified. To perform adaptive compensation over a wide range of measurands, a novel CMOS multiplier has been developed and the operation of the adaptive compensation filter has been verified through simulations based on realistic CMOS transistor models. It has been shown that the power consumption of a class AB SI compensation filter is considerably lower than other compensation methods.
University of Southampton
Jafaripanah, Mehdi
21e2ef95-1f99-44e4-b6e3-9358dc41baf6
2005
Jafaripanah, Mehdi
21e2ef95-1f99-44e4-b6e3-9358dc41baf6
Jafaripanah, Mehdi
(2005)
Analogue adaptive techniques for dynamic sensor frequency compensation.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This research investigates the application of analogue adaptive techniques and their practical validation for dynamic sensor compensation, of which there is little reported work in the literature. This is illustrated by showing how the response of a load cell can be improved to speed up the measurement process. Since the load cell possesses an oscillatory output, in which the measured contributes to the response parameters, an adaptive compensation filter is needed to track variation in measurand of the load cell whereas a simple, fixed filter is only valid at one specific load value. Voltage-mode and current-mode analogue adaptive filters have been investigated and suitable circuit topologies have been identified with simple adaptation process and effective compensation.
To facilitate this investigation, computer models for the load cell and the adaptive compensation filter have been developed and circuit-level simulations of the models have been performed. To validate the models in practice, a discrete implementation of the analogue adaptive filter has been developed, in which a novel piecewise linearization technique has been proposed in order to vary a floating voltage-controlled resistor in a linear manner over a wide range. Simulation and practical results are presented, thus demonstrating the effectiveness of the analogue adaptive compensation method.
In order to develop an integrated implementation of the adaptive compensation filter compatible with a digital CMOS process, the switched-current (SI) technique has been investigated and a suitable SI based filter has been identified. To perform adaptive compensation over a wide range of measurands, a novel CMOS multiplier has been developed and the operation of the adaptive compensation filter has been verified through simulations based on realistic CMOS transistor models. It has been shown that the power consumption of a class AB SI compensation filter is considerably lower than other compensation methods.
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Published date: 2005
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Local EPrints ID: 465677
URI: http://eprints.soton.ac.uk/id/eprint/465677
PURE UUID: aed05de3-d6d2-491f-9c1a-7527950ce656
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Date deposited: 05 Jul 2022 02:32
Last modified: 05 Jul 2022 02:32
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Author:
Mehdi Jafaripanah
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