Numerical - Unity gain frequency for short circuit CE transistor

Q.  What should be the value of unity gain frequency for a short circuit CE transistor with gain of 30 at 4MHz and cut-off frequency of about 100 kHz?
- Published on 24 Sep 15

a. 40 MHz
b. 80 MHz
c. 120 MHz
d. 150 MHz

ANSWER: 120 MHz

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    Given data: ¦AI¦= 30 at f = 4 MHz,

    fβ = 100 kHz

    To determine: Unity gain frequency (fT)

    Formula: fT = ¦AI¦x f

    Method of computation: According to the concept of unity gain frequency,

    fT = ¦AI ¦x f

    = 30 x 4 x 106

    = 120 x 106

    = 120 MHz

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