所屬科目：中山◆電機◆電子學
1.(15%) A second-order filter has its poles at s = -(1/4)The transmission is zero atω = 3 rad/s and is unity at dc (ω = 0). Find the transfer function. (15%*1)
(b) Use the short-circuit time-constants method to estimate the lower 3-dB frequency, fL. (Hint: In determining the resistance seen by C1, the effect of the 47-kΩ resistor must be taken into account.)
(b) Draw the small-signal equivalent circuit of the entire amplifier and give the values of all its components. Neglect.(10%)
(c) Find
(d) Find
(e) For RL= 2 kΩ, find .
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The transmission is zero atω = 3 rad/s and is unity at dc (ω = 0). Find the transfer function. (15%*1)
= 15 V,VT = 0.025 V, R1 = 100 kΩ, R2= 47 KΩ, RE = 3.9 kΩ, Rc= 6.8 kΩ, and β =
100, determine the de collector current of each transistor. (5%)
.(10%)
.