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=Electronics Hardware Questions=


Q: A device draws higher current when temperature gets:
- higher?
- lower?

A1: the higher temperature the higher consumption current.
A2: A device draws higher current when temperature gets lower. We know from VLSI basics that a current through a MOS transistor depends on 2 parameters:
Vt - threshold voltage ;
K - coefficient of electron mobility and device geometry aspect.
Both Vt and K are temperature sensitive.
The magnitude of Vt decreases by 2mV for every 1 degree C rise in temperature. This decrease in Vt correspondingly increases drain current. However, K - decreases with temperature and its effect is a dominant one. This may sound strange to you, since we remember from physics that electron mobility increases with temperature. Yes, the chaotic electron mobility increases and interferes with direct current flow.
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