Faculty of Engineering and Design
Electrical-Electronics Engineering Division
08.12.2014
Electronic Circuits II
Homework 2
(Ast. Prof. Dr. Vedat TAVAS)
+VCC =+6V
2K5
R E3
R1
Q3
vi R B1
VI +
v1
vg
R5
Q2
Q1
R4
5K
1K
10K
R3
VO
+ vo
6K
R2
-V EE=-6V
For the transistors used in the above circuit, VBE1  VBE2  -VBE3  0,7V, hFE1  hFE2  hfe1  hfe2  200,
hFE3hfe3100, VT26mV, VA=, rbb’0 ve IC1IC2 are given. The circuit is biased as when the input
signal VI = 0 output voltage VO = 0. Then:
a. Calculate the collector current values of each transistor, RE3 and RB1 resistors values using dc
analysis.
b. Draw the feedback circuit and calculate  value. Determine the type of feedback.
c. Calculate the mid-frequency voltage gain of the circuit, KV=vo/v1.
d. Calculate the input resistance of the circuit, rif..
e. Calculate the output resistance of the circuit, rof.
f. Calculate the mid-frequency voltage gain of the circuit, KV=vo/vg.
g. Verify your results from c to f using Pspice.
Deadline: 20.12.2014