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Project of a bandgap voltage reference and a temperature sensor for "energy harvest" systems
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The objective of this thesis is to study the behaviour of a bandgap voltage reference
and develop it in order to be more efficient than the existing ones. In this case having
applicability in energy harvest, the main approach for this circuit is to reduce the power
dissipation and at the same time guarantee a stable of the reference voltage. This can be
achieved through the utilization of MOS transistors which can work with a lower voltage
then bipolar transistors. The reference voltage circuit present in this thesis can work with
a supply voltage as low as 500 mV.
In energy harvest systems besides the need to work with extremely low voltages, the
sensitivity of the signals is very high, to temperature variation. So it was also important
to work with an extended ranges of temperature.
For this work it was also developed a temperature sensor so that it has applicability in
various fields. The sensor works by currents generated by the bandgap voltage reference,
having similar results to a dual slope integrating analogue-to-digital converter, although
its operation and logic are quite different.
The proposed solution is to implement a reference voltage generator powered by a
voltage source of 500 mV, with a consumption of about 7 W. Having a temperature
coefficient slightly below 74 ppm/ C and a temperature sensor with linearity quite satisfactory.
Descrição
Dissertação para obtenção do Grau de Mestre em
Engenharia Electrotécnica e Computadores
Palavras-chave
Bandgap Temperature sensor Temperature to digital converter