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Wave Optics

Question
CBSEENPH12039147
Wired Faculty App

Output characteristics of an n-p-n transistor in CE configuration is shown in the figure. Determine:

(a) Dynamic output resistance

(b) DC current gain and

(c) AC current gain at an operating point VCE=10V, when IB=30 straight muA.        


Solution

Dynamic output resistance is given by,

 Error converting from MathML to accessible text.

For IB = 30 straight muA,  = (12-8) = 4V and  = (3.6-3.4) = 0.2 mA

Therefore, output resistance, Error converting from MathML to accessible text. 

 ii) dc current gain is given by, beta subscript d c end subscript space equals space I subscript c over I subscript B

At  = 10 V and Ib = 30 straight muA

Ic = 3.5 mA
beta subscript d c end subscript= Error converting from MathML to accessible text. = 117

iii) AC current gain is given by,  beta subscript a c end subscript space equals space fraction numerator increment I subscript c over denominator increment I subscript B end fraction

 At VCE = 10 V, = (3.5 -2.5) mA = 1 mA and 

 increment I subscript B italic space italic equals italic left parenthesis italic 30 italic space italic minus italic space italic 20 italic right parenthesis italic space mu italic space A italic space italic equals italic space italic 10 italic space mu A= (30 -20) A = 10 A
therefore space space space space space beta subscript a c end subscript space equals space 1 over 10 space equals 100

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