What is the difference between NTC and PTC probes?
For an NTC thermistor, as temperature increases, resistance decreases. For a PTC thermistor as temperature increases, resistance increases.
How many types of PTC are there?
The positive temperature coefficient, PTC thermistor has two types: silistor & switching PTC have very different characteristics. As the name indicates a positive temperature coefficient, PTC thermistor has a response in which the resistance rises with increasing temperature.
What is bandgap in VLSI?
A bandgap voltage reference is a temperature independent voltage reference circuit widely used in integrated circuits. It produces a fixed (constant) voltage regardless of power supply variations, temperature changes, or circuit loading from a device.
What do you mean by temperature coefficient?
: a numerical value indicating the relation between a change in temperature and a simultaneous change in some other property (as solubility) specifically : the factor α in the equation Rt = Ro(1+αt) in which Rt equals the resistance of a conductor at t° centigrade and Ro equals its resistance at 0° centigrade.
What is the difference between RTD and NTC?
Whereas in RTDs there is a positive correlation between resistance and temperature (as temperature increases, resistance increases as well), in negative temperature coefficient (NTC) thermistors, the inverse relationship holds (resistance decreases as temperature increases). …
Which is better NTC or PTC?
Why is one diode used in the circuit for compensation?
To cancel the changes in IC , one diode is used in the circuit for compensation The changes in VBE. Due to temperature are compensated by changes in the diode voltage which keeps IC stable at Q point. * In germanium transistor changes in ICO with temperature plays an important role collector current stability
What is the effect of temperature on voltage across a diode?
If the diode used in the circuit is of same material and type as the transistor, the voltage across the diode will have the same temperature coefficient as the base to emitter voltage VBE . So when VBE changes by ∂ VBE with change in temperature, VD changes by VD and ∂ VD~=~∂ VBE, the changes tend to cancel each other.
What is compensated temperature range?
No other term is as misleading as “compensated temperature range”. Let´s first begin with what is meant: The compensated temperature range is the temperature range in which the temperature error, and accordingly the temperature coefficients, are valid.
What is the voltage drop across a forward biased diode?
The voltage drop across a forward-biased diode varies only a little with the current, and is a function of temperature; this effect can be used as a temperature sensor or as a voltage reference.
