BJT Small Signal Analysis Solved Example | Quiz # 245

In this video, the solution of Quiz # 245 is provided.
Here is the detail of the Quiz.
Subject: Analog Electronics / Linear Electronics
Topic: BJT (Bipolar Junction Transistor)
For more solved examples on BJT, check this playlist:
• Bipolar Junction Trans...
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The Quiz will be helpful to all the students of science and engineering for preparing for university or competitive exams (GATE, IES, RRB JE, etc.)
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[@mercy.m9240]

Sir I would just like to ask, what if we had a resistor connected to the base and directly connected to the AC source meaning there's no coupling capacitor in series with the base resistor How would that affect our DC calculations Would we have to get the peak voltage for the AC source or?

[@prashantsingh9727]

No bro!! As in dc analysis there is a assumption that we would do all ac sources as zero ...so according to this assumption we would replace the ac voltage source with short circuit

[@abdulmatinhashmi8479]

I got stucked in finding collector current , didn't recognised to go for dc analysis 😢

[@wardenofthelight1122]

Thank you for the video, but I hope you can pronounce the words with clarity. Some words were inaudible or unintelligible. Thank you.

[@catnipaddict126]

Can the base be connected to the collector through the Vin source and then the resistor Rc for small signal analysis since one terminal of the ac voltage source is connected to ground and Rc is connected to ground as well

[@allaboutelectronics-quiz]

I have already shown the small signal equivalent circuit at 4:17. You can refer that.

[@neilcullimore5798]

Would it be better to say VE=0-0.7v=-0.7V. And VRE= -0.7v-(-10V)=9.3V ? With respect

[@chardapd3567]

I'm confused with the negative sign.. -ic if the model always points in downward direction does it mean that ic will always be negative? or the arrow in the model can also point upwards? can someone explain it? I've got the right answer of 89 but I don't understand why it comes up negative..

[@user-fy4gv7bn5f]

Due to 180 degree phase shift That will be negetive

[@vatsalyaa.m]

4:34 Shouldn't Vo be Ic.Rc Or Ic.Rl Because they are in parallel, so voltage difference across both of them is Vo

[@allaboutelectronics-quiz]

Since Rc and RL both are in parallel, so you need to find the parallel combination of both resistor. If you just want to consider any individual element. e.g Rc and RL, then first you need to find the exact current which is flowing through Rc and RL. Since both are in parallel, current Ic will get divided between them. Using current divider rule, you can find that. But you will see that, eventually, with that method also, you will get the same equation. I hope, it will clear your doubt.

[@aviationislife1270]

sir what is the value of beta

[@allaboutelectronics-quiz]

Here value of Beta is not given. But we have been given that, the base current is negligible. So, we can assume that Beta is very high and Ic ≈ Ie.