| Summary: | The subject of this M.Sc. Thesis deals with the design of a fractional - order compensator. An innovative way of design is presented having the multiple benefits of
fractional calculus, such as the easier tuning of the system.
In particular, the design of a compensator for the car suspension is presented, in
order to control the vertical oscillation of the wheels, implying an oscillation of their
distance from the main suspended body of the vehicle with main purpose, reducing the
oscillations that reach the body. The compensator circuit is initially approached with
various MATLAB command set methods that aim to create integer class polynomials
equivalent to the fractional transfer function. Fractional - order elements are not yet
commercially available, so these approaches are necessary. Then, after presenting and
comparing the results of these methods and selecting the case with the the lowest
error, the implementation of the circuit is supervened.
The implementation of the control system has been carried out using MOS transistors that operate in the sub threshold region and allow operation with low voltage
and power consumption.
The last part is the simulation of the system at layout level and the presentation
of the fully integrated, and fully electronically controlled circuit and its response.
The performance of the proposed system is verified through post-layout simulations
using Cadence and the Design Kit provided by the Austria Mikro Systeme (AMS)
0.35µm CMOS process.
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