Solve this. 

Q.  What should be the value of unity gain frequency for a short circuit CE transistor with gain of 30 at 
​4 MHz and cut-off frequency of about 100 kHz? 
 
40 MHz 

80 MHz 

120 MHz 

150 MHz

 Dear Student,
                                     As given the values, Al = 30 and f = 4MHz. and the cutt- off frequency, fc= 100KHz
​             So, the unity gain frequency, fT= Al x f
                                                              = 30 x 4 x 106
                                                              = 120 MHz.
                Hence option (c) is correct.

Regards

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