hey,
in the art of electronics there are two formulations for how bjt's react to temperature changes, they are...
(1) Vbe falls at 2mV/degree C and
(2) Ic grows at 9%/ degree C
the text uses an example (page 85) where it suggests that a 20 degree C temp increase leads to a 25% increase in collector current. Using the first formulation its easy to calculate that Vbe decreases by 40mV and therefore Ve increases by 40mV (because Vb is fixed). The 40mV increase of Ve increases Ie and therefore Ic by 25% from 1mA to 1.25mA.
Can anybody tell me how the second formulation (Ic grows at 9%/ degree C) is consistent with these calculations.
in the art of electronics there are two formulations for how bjt's react to temperature changes, they are...
(1) Vbe falls at 2mV/degree C and
(2) Ic grows at 9%/ degree C
the text uses an example (page 85) where it suggests that a 20 degree C temp increase leads to a 25% increase in collector current. Using the first formulation its easy to calculate that Vbe decreases by 40mV and therefore Ve increases by 40mV (because Vb is fixed). The 40mV increase of Ve increases Ie and therefore Ic by 25% from 1mA to 1.25mA.
Can anybody tell me how the second formulation (Ic grows at 9%/ degree C) is consistent with these calculations.
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