NPN Bi-Polar Transistor Saturation - CircuitLab Support Forum

NPN Bi-Polar Transistor Saturation SOLVED

Can someone show me how I can find out when this circuit is in saturation mode? I am lost with that.

Thanks!

by ear5256
September 25, 2012

Any bjt is in saturation if:

i) Ic < Ib*Hfe

where Hfe represents the nominal DC current gain of the device.

ii) Vbe > 0 for NPN Vbe < 0 for PNP

iii) Vbe > Vce

Note that because β (beta) is defined as Ic/Ib, this is the same as saying that the β in saturation decreases with respect to the nominal operating β.

http://www-inst.eecs.berkeley.edu/~ee105/sp08/lectures/lecture5_6.pdf

http://en.wikipedia.org/wiki/Bipolar_junction_transistor

by signality
September 26, 2012

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NPN Bi-Polar Transistor Saturation SOLVED

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