| Περίληψη: | Lungs are a vital organ for human body and that's why its proper and smooth functioning is extremely important. Lung impedance is a characteristic which could be studied and simulated by the behavior of a RC equivalent circuit. In this M.Sc. Thesis, a fractional-order circuit for the model of lung impedance was designed. The proposed topology offers the benefit of implementing orders between 0 and 2 only by changing the bias currents of the active elements of the circuit.The presented idea of this M.Sc. Thesis is the implementation of the electrical equivalent of lung impedance with only one topology, using fractional-order calculus and taking into account the use of the minimum number of active elements as well as the minimun spread of the capacitors used.
The impedance of the model it is implemented using Operational Transcoductance Amplifiers (OTAs), taking advantage of the electronical adjustment of the scaling factors and the time-constants of the circuit and consequently its transfer function. The approximation of the model is 1st-order Partial Fraction Expansion. The transistors of the Operational Transconductance Amplifiers (OTAs), operate in the weak inversion region, achieving low voltage and low power consumption. The verification of the performance of the proposed circuit is carried out through post-layout simulations using Cadence and the Design Kit provided by the Austria Mikro Systeme (AMS) 0.35μm CMOS technology process.
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