I am sorry that the title was typed wrong, the correct one should be "An amplifier circuit".
Could you please help me through this problem about amplifier circuit:
In figure 3a) there is shown an amplifier circuit based on a npn-transistor and figure 3b) illustrates its small-signal model.
(a) Explain what is the small-signal model and what is it used for. What is
descriped by the symbols (r_π, C_π, etc.) in figure 3b)? Is there anything
missing?
(b) Determine the gain of the system A = Vo/Vs at low frequencies (C_C1
and C_C2 more significant than the other capacitances) assuming RB》r_π. Explain qualitatively what happens at very high frequencies and at
middle frequencies.
Thanks a lot for looking and helping!
Could you please help me through this problem about amplifier circuit:
In figure 3a) there is shown an amplifier circuit based on a npn-transistor and figure 3b) illustrates its small-signal model.
(a) Explain what is the small-signal model and what is it used for. What is
descriped by the symbols (r_π, C_π, etc.) in figure 3b)? Is there anything
missing?
(b) Determine the gain of the system A = Vo/Vs at low frequencies (C_C1
and C_C2 more significant than the other capacitances) assuming RB》r_π. Explain qualitatively what happens at very high frequencies and at
middle frequencies.
Thanks a lot for looking and helping!
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