A transistor is a temperature sensitive device explain?
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The current gain is sensitive to temperature, and that is important in many amplifier designs. The biasing method usually includes negative feedback to correct for changes in the current gain, so the operating point remains relatively stable. Negative feedback is also used to stabilise the gain.
Other parameters change with temperature, especially the forward bias voltage between the base and emitter at a specified current. This can be used as a temperature sensor, as for a forward biased diode. See the link below for details on biasing methods.
These changes are less important when used as a simple switch, because the transistor is in a limiting condition. The collector to emitter voltage does change a little, but not always important, and if the beta (current gain) is marginal it could be enough to cause prevent proper switching action (can't turn on enough to limit).
Other parameters change with temperature, especially the forward bias voltage between the base and emitter at a specified current. This can be used as a temperature sensor, as for a forward biased diode. See the link below for details on biasing methods.
These changes are less important when used as a simple switch, because the transistor is in a limiting condition. The collector to emitter voltage does change a little, but not always important, and if the beta (current gain) is marginal it could be enough to cause prevent proper switching action (can't turn on enough to limit).
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