November 2019 StudentZone Quiz Solution

Question 1:

Can you derive the sensitivity in mV/ºC you measured from the diode equation?

Answer 1:

We can obtain the sensitivity in mV/ºC measured from the diode equation by taking into account the following values from the activity:

Tref=25ºC

Vref=-6.953mV (obtained from the measurement presented in Figure 3)

Vtemp=7.879mV (obtained from the measurement presented in Figure 4)

The temperature of the sensor can be obtained using the following formula:

The sensitivity of the sensor is computed as follows:

Question 2:

What is the purpose of the reference diode in this configuration?

Answer 2:

The reference diode serves as the temperature reference maintained at a constant temperature, considered as room temperature (25º C) for the experiments.

The sensitivity of the sensor is computed as follows: