ALMEIDA, W. R. M.; http://lattes.cnpq.br/2668882206079613; ALMEIDA, Will Ribamar Mendes.
Resumo:
The thermo-resistive sensors are part of a series of components sensitive to
temperature, which are widely used in the field of electronic instrumentation. Among
these applications, there are meters of physical quantities using the principle of
equivalence and its power based on the modulation sigma-delta (ΣΔ), where the
sensor is part of the feedback loop of the structure. Some reasons for the use of ΣΔ
modulator in electrical engineering are: the reduction of analog circuits, high
resolution and high signal-to-noise ratio.
In this thesis, we present the design of a measurement system based on ΣΔ
modulation that uses the thermo-resistive sensor as an integrator and a comparator.
The architecture of the proposed system allows the introduction of measurement of
physical quantities that interact with the sensor: the temperature, thermal radiation
and wind speed. Procedures are presented for the specifications required for
development in VHDL-AMS. After verifying the feasibility of the functional
architecture, the ΣΔ modulator is designed in terms of transistors in the design of
their layout, using a TSMC 0,35 CMOS technology.
The simulation results are presented to demonstrate the validity of the
theoretical study carried out, which shows the correlation between the results of the
functional model (VHDL-AMS), the electric model and the equations developed.