Q1.
R1
Vi
Q1
Z2
Rs
C1
Vs
Z?
+Vcc
Q2
C2
Vo
R2
-VEE
Figure-Q1
Consider the cascading amplifier setup in the above Figure-Q1 circuit diagram, where Q1 and Q2 are
identical.
Here,
$R_s = 1k\Omega$, $R1 = R2 = 5k\Omega$, $h_{ie} = 2k\Omega$, $h_{fe} = 50$, $h_{re} = 6 \times 10^{-4}$, $h_{oe} = 25\mu A/V$,
$h_{ic} = 2k\Omega$, $h_{fc} = -51$, $h_{rc} = 1$, $h_{oc} = 25\mu A/V$.
a) Draw the low-frequency equivalent circuit using the h-parameter model of the transistors.
b) Calculate the input impedances $Z_1$ and $Z_2$ of the two cascaded stages.
c) Calculate the voltage gains of the two stages.
d) Hence calculate $\frac{V_o}{V_i}$
