Question

4. Consider the BJT cascade amplifier shown below Vcc 18V R1 3.3ko 15uF r Vo RL B 150 Rsa 500? 56k? Vi B 150 C1 CE 2.2k? a) Find the DC collector current (approximately the same in both transistors). b) Find the input impedance, output impedance, and no-load voltage gain. c) Find the Av, Avs, and Ai d) Estimate the lower cutoff frequency e) Why does this amplifier have better high-frequency performance thana common-emitter built using the same type of transistor and using the same bias point?

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caleulata calie tor dussent X 13 ㄧ与_c.ID3 tt. S시0 loo. 8 X 103 13:1x103 Vthe 3 Ret US

164-2 x Io 6.3mA t impedance otput impedante f cun Re Re.

Date atine ut d edarve: 3. 133 K23 J13.5 v AV 3.S 18 Av To Vi าน่

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