Electronics and Communication Engineering - Analog Electronics - Discussion

40. 

The 'h' parameters of the circuit shown in the figure are hib = 25 Ω, hfb = 0.999 and hob = 10-6Ω The Voltage gain is

[A]. 0.99
[B]. 1.98
[C]. 2.0
[D]. 4

Answer: Option D

Explanation:

Zi = 25 + 10-6 x 0.99 x 104 25

.


Abhi said: (Aug 5, 2016)  
Can't understand How? Explain clearly.

Arun said: (Oct 12, 2016)  
Please explain the solution in right way.

Ajit Dubey said: (Nov 11, 2016)  
For approx calculations of CE amplifier input impedance Ri = hib = 25 and c is shorted for ac analysis, for current gain Ai = Hfb = 0.99.
So put all this in Av = Ai * RL/his. Hope this helps.

Liza said: (Jun 5, 2017)  
How can we get the value of zL?

Subbu said: (Jul 25, 2017)  
zL is load resistance or effective resistance seen a/c the load hence zL=Rc=10k=10^4.

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