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# AE_Tutorial 5_Mid&High frequency Analysis of CE & CB BJT Amplifier

Module by: Bijay_Kumar Sharma. E-mail the author

Summary: AE_Tutorial5_This gives problems on CE and CB Amplifiers.

TUTORIAL 5_MID & HIGH frequency analysis of CE & CB amplifiers.

(1)

Q point(1.6mA,3V)

Find Avo And fh.

Solution:-

(2)In problem (1),if Cµ =1pF,what is the new value of AVo &fh ?

[Answer:- AVo remains -153 but fh deteriorates to 835kHz.]

(3) Given CB BJT Amplifier in Figure 2.

All the parameters are the same & Q point is the same.

RC = 22k, RL = 75k, RE = 43k, RS = 0.1k;

[Ans: AVS=48, fh=10.7MHz]

Solution: We will have to use the T-model for analyzing CB BJT Amplifier and we will use open circuit time constant method for detrmining the upper -3dB frequency.

Cµ =0.5pF, Cπ =19.9pF

MIDBAND GAIN Analysis:

At high frequency

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