SaM - Classical Band Gap Based Temperature Sensor (2 Pins)

Remeber:

Here we have a scheme of a device that be considered like the current generator where the current generated depends on $T$:

• At the top of the generator we have a current mirror.

Here’s the same device as a current generator:

• The user has to select the value of $R$, so it is an external resistance.

There are also integrated circuits that behave not as current generators but has voltage generators:

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we look at a device which can be considered like the current generator where the current generated depends on $T$:

• The user has to select the value of $R$, so ti is an external resistance.
• At the top of the generator we have a current mirror, therefore here you have $I_C$ and here you have the same $I_C$ and here we have the structure as we have discussed before.
• So same as before, except for $R$ that in this case has to be selected by the user.

Actually there are also integrated circuit that behaves not as current generatosr but has voltage generators. Voltage Outptut (2 Pins):

• The two pins are $-$ and $+$, the voltage drop between the two ($V(T)$) is the output.
• This time we have this voltage here which is regulated by the current flowing here by this $V_{BE}$ which we know is proportional to the temperature.