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Hey, where's your ground of circuit?
The rest of derivation is ok.

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By tima and syakira (question

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By syakira and tima (part 1

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By tima and syakira (part

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Heng sheng wei and choe yhou song (12/20)

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Heng sheng wei and choe yhou song (12/20)

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Your equivalent circuit went wrong due to misplace of gmVpi. Please look at carefully, where it supposed to be connected? On the above circuit, you note it correctly but when you transfereed into better representation, it went wrong. Then, all derivation affected. I only found the correct point is only at Vin=Vpi.

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Common base bjt by (Heng sheng wei and choe yhou song)

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Common base bjt by (Heng sheng wei and choe yhou song)

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Question

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Common base bjt by(Heng sheng wei and choe yhou song )

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Common base bjt by(Heng sheng wei and choe yhou song )

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Part1

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Common base bjt by (Heng sheng wei and chou yhou song

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Common base bjt by (Heng sheng wei and chou yhou song

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Part2

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Common base bjt by ( Heng sheng wei and choe yhou song

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Common base bjt by ( Heng sheng wei and choe yhou song

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Part3

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Chai Cho Khian and Ling Chung Yee (12/20)

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Chai Cho Khian and Ling Chung Yee (12/20)

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At midband, all capacitors become close switch. Why your bypass capacitor is opened? Since your equivalent circuit is wrong, everything is affected. Only Zo value is correct here.

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Chai Cho Khian and Ling Chung Yee

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Chai Cho Khian and Ling Chung Yee
Working step 1

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Chai Cho Khian and Ling Chung Yee
Working Step 2

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Your derivation on Zi has some mistakes. Please check.

In the task, I ask to derive for Ai as well, but it's not shown here, why?

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The equivalent circuit is correct but, there are some mistakes in derivation of parameters.
please recheck your Zi, you can't simply parallel the resistance such way. The reference terminal is not equal, one at E while one one at B. thus, all equation related to Zi, Vi and Ii in your solutions are affected.

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Good job! All important working solution are done well

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Please label Vpi and its polarity in the equivalent circuit.Suppose Vi=-Vpi, then you'll get Avoc, Av, Ai in positive value.

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qayyim , firdaus samsudin , amirul syahmi (12/20)

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qayyim , firdaus samsudin , amirul syahmi (12/20)

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Senget kepala saya nak tengok your solution. Please rotate it first before upload.
Similar to Cho Kian & Chung Yee's, your Re should be removed from the equivalent circuit because it is bypassed by the shorted capacitor.Then, your derivation of Zi became wrong and all subsequent derivation used Zi became wrong too.

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Common Emitter by (qayyim , firdaus samsudin , amirul syahmi

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Why Re is still there in your equivalent circuit?In midband anlysis, it should be bypass by the shorted capacitor.Thus, your Zi is wrong and related derivation which you considered Re went wrong.

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lok shun  zhi, lim yi xian, lai siew kee (20/20)

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lok shun  zhi, lim yi xian, lai siew kee (20/20)

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Ini pun sama seperti group Qayim, senget kepala saya. Please rotate before upload.
Luckily, everything is correct in working solution. Good job

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Your Vpi polarity is incorrect, then the final derivation of your equation would affected on its positive/negative value. What is your Zb value? no derivation on that prameter shown in your working solution

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COMMON COLLECTOR BJT (JALIL & FAKHRUL) 1

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COMMON COLLECTOR BJT (JALIL & FAKHRUL) 1

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Good job! All important working solution are done well

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1.Ahmad Izzuddin bin Ishak
2.Muhammad Amirul Nazhan Bin Mohd Haniff
3. Muhammad FahmeyBin Rozlan

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Zo is ok. I think there's mistake in your Zi, it should be something else. Thus, derivation on Avs and Ai might affected as well. Please revise.

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Mahmuda binti Ismail
Nursafirah binti Darsono

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Hariz Danial
Hafiz Yahya

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By Bee wei xin

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question

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lok shun  zhi, lim yi xian, lai siew kee

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MUHAMMAD DANIAL BIN SAFARRUDIN (A17KE0157)
MUHAMMAD AMIRUL IRFAN BIN MISNON (A17KE0151

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Common Base ( Zulhairy , Arif Zahrin , Firdaus Zulkifli )

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working step 1 ( zulhairy , arif , firdaus )

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working step 2 ( zulhairy , Arif , Firdaus )

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Izzuddin
Fahmey
Nazhan

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safirah
mahmuda

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Hariz Danial
Hafiz Yahya

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By Bee wei Xin

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lok shun  zhi, lim yi xian, lai siew kee

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part 1

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Safirah
Mahmuda

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Hariz Danial
Hafiz Yahya

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lok shun  zhi, lim yi xian, lai siew kee

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part 2

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Common base midband hybrid pi ac equivalent circuit 

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Common base midband hybrid pi ac equivalent circuit 

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lok shun zhi, lim yi xian, lai siew kee