Is a temperature sensor a transistor?
PTAT circuits using either BJT or CMOS transistors are widely used in temperature sensors (where we want the output to vary with temperature), and also in bandgap voltage references and other temperature-compensating circuits (where we want the same output at every temperature).
What is temperature coefficient of a diode?
Diodes are frequently used as temperature sensors in a wide variety of moderate-precision temperature measurement applications. Linear temperature coefficient such as –2mV/C° across operating temperatures makes diodes a great solution for flexible and low-cost applications.
How is the case temperature of a BJT measured?
The base-emitter junction of a BJT has a very predictable transfer function that is dependent on temperature. So, in order to measure the case temperature of a device or board temperature, we can use a discrete NPN (or PNP) transistor as shown in the next figure.
How is the transfer function of a BJT dependent on temperature?
Temperature Sensor BJT The base-emitter junction of a BJT has a very predictable transfer function that is dependent on temperature. So, in order to measure the case temperature of a device or board temperature, we can use a discrete NPN (or PNP) transistor as shown in the next figure.
Can a silicon diode be used as a temperature sensor?
At this point, it’s worthy to take notice that just about any silicon diode/bipolar junction transistor can be used as a temperature sensor, and in most instances, any precision op-amp can be used for sensor signal conditioning (speed is usually not a big concern).
Can you use any type of BJT in a VBE circuit?
You can use many (but not any) type of BJT and get good results. You should not use general parts like 1N400x 1N4148 1N914 diodes or rectifiers or RF BJTs or OC71 germanium transistors or massive 2N3055 power transistors for this kind of Δ -Vbe circuit.