re Model (Fixed-Bias Configuration) | Part 2 Neso Academy

Analog Electronics: re Model (Fixed-Bias Configuration) | Part 2
Topics Covered:
1. Current divider rule.
2. Current gain for CE fixed-bias configuration using re model.
3. Current gain when re model output resistance (ro) is large.
4. Current gain when base and collector resistance are large.
5. Overall current gain.

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Best comment

1. agaelema: Congratulations on your videos, your teaching is amazing. Just one question, the correct assumption for "zi" is not: "zi = (Bcc + 1)*r'e" if "Rb >= 10*(Bcc + 1)*r'e"? (as in the last video)?
2. SHIVAM CHOUDHARY: yep..exactly
3. Bhavan S H: Kesav Kumar beta is large so (B +1 )~= B
4. Shambhavi Tripathi: Wonderful lectures. Sir, please complete the analog electronics series. It is very helpful. Thanks.
5. S Y11: sir alhamdulillah ur lectures r awesome. i havve not understood why Zi is Rb?
6. all love: oyou gotta watch the previous lecture. he did take ro. Its just that it was a part of a fraction and canceled out. [ Zo =(roRc)/(ro + Rc)]...Rc is removed from denom...ro canceled with the numerator
7. Nanof Urbiznis: You are simply awesome. Studying for my EE exams is so much more productive thanks to your videos.
8. Nanof Urbiznis: If RL is not connected shouldn't the Output Current be = βI_b = I_c? My professor in class was using current divider with ro for some reason to find I_o. It makes no sense. I_o should be the same as I_c when RL is not connected. Am I correct?
9. Juanjose Almarales: thank you, I have learn so much with yor videos. there is something i dont understand. when there are two resistences in parallel and one is 10 times less than the other one, the equivalent resistance is the less of them, then is Rb | | (β+1)re and Rb≥10(β+1)re then Zi=(β+1)re. I think the error is in the condition and actually is Rb≤10(β+1)re
10. Chaviti keerthi: Sir I have a doubt. When ro>>10rc.we should take ro value. Why u select rc. Pls rly anyone
11. Dheyaa Alhajjar: zi=RB !!!!! how.
12. ashish burnwal: Zi will be beta*Ib
13. Pranchal gupta: In previous video u said zi is equals to (B+1)re bt in this lecture u r saying that zi is now equals to rb how is it possible
14. Keyser Söze: What if Rb=Rc=0(no bias) Then Ai=0? But Ai =Beta is the right answer
15. Kesav Kumar: Zi=(β+1)re will the correct one

re Model (Fixed-Bias Configuration) | Part 2
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Education	Upload TimePublished on 13 Jul 2016