novice_vlsi
Newbie level 5
Why Transistor is built with 3 terminals NPN.
why not 4 terminals like NPNP.
Thanks,
novice_vlsi
why not 4 terminals like NPNP.
Thanks,
novice_vlsi
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A transistor is, in simple terms, a current-controlled current source,
Actually, it is a voltage controlled current source.
The collector current is a function of the base - emitter voltage.
However, for many applications. it can be considered to be current controlled.
But you can't explain circuits such as the current mirror if you assume current control.
Actually, it is a voltage controlled current source.
The collector current is a function of the base - emitter voltage.
However, for many applications. it can be considered to be current controlled.
But you can't explain circuits such as the current mirror if you assume current control.
Yes, Ic = β Ib is correct. That is a very useful relationship.Just asking....
as Ic=(beta)*Ib thus output current depends upon the input current.....so it should be current controlled current source....
although we can control the input current(Ib for common emitter) and thus it indirectly becomes voltage controlled current source...
please correct if i am wrong !! ;-)
Actually, it is a voltage controlled current source.
The collector current is a function of the base - emitter voltage.
However, for many applications. it can be considered to be current controlled.
But you can't explain circuits such as the current mirror if you assume current control.
I agree that Ic=β*Ib is very useful for linear and switching circuits.Yes, once you get out of the linear region, that is the more correct way of analyzing the device. For a beginner doing simple circuits, using Ic=β*Ib will be much easier to do a quick analysis to get him/her moving forward.
YMMV.
No, it is approximatelyokay i got it....
so in a nut shell....
Ic depends on Ib and Ib depends on Vbe
so we get.... that Ic depends on Vbe
so it becomes... Ic = β*Io(exp(-Vbe/Vt)-1)
Thus it's an Voltage controlled current source.... :-D ;-)
Hence proved....