For students only

1. Subject Name: E N A (lab)
Mini Project Name: To verify the characteristics of CC Amplifier
Group Members:
AMIN UR REHMAN
 ALI KARIM

2.  What is Common collector Amplifier ?
 It is bipolar junction transistor (BJT)
 Common collector amplifier has collector common to both input and
output.
 In this circuit the base terminal of the transistor serves as the input, the
emitter is the output, and the collector is common to both.
 The common collector amplifier is also called “Emitter Follower” because
the input signal is coupled to the base, and the output signal is taken
the emitter.
+

3.  CONSTRUCTION OF CC AMPLIFIER:
Components used:
Resistors:
I.R1 =9.98 k Ω
II.R2 =450 Ω
III.RE =475 Ω
IV.RL =50 Ω
Transistor:
I.NPN (Q2N2222)
Capacitors:
I.C1 = 10 uF
II.C2= 10 uF

4. 50
475
9.98k
450
+20 V
AC 0v
Voff 0V
Vampl 80mV
freq 900Hz
Phase 0
Q2N2222
10uF
10uF
Common Collector Circuit Diagram:

5. AC Equivalent Circuit Using model ᴫ model:
In AC Equivalent Circuit all the DC sources are replace by short circuit
Β(re/
+re)

6. DC Equivalent circuit:
For DC equivalent circuit replace all the capacitor by open circuit
so the Diagram will be as shown below
450
+20 V
Q2N2222
475
9.98k

7. Application of CC Amplifier
 CC Amplifier is current or power amplifier.
 CC Amplifier is used for impedance matching.
 The step up impedance is the major advantages of CC amplifier,
Small load resistance that would overload CE amplifier can be used
CC-amplifier because it step up the impedance and prevent from overloading.

8. COMMON COLLECTOR, EMITTER FOLLOWER TRANSISTOR
AMPLIFIER CHARACTERISTICS
PARAMETER CHARACTERISTIC
S
Voltage gain Zero
Current gain High
Power gain Medium
Input / output phase relationship 0°
Input resistance High
Output resistance Low

9. Simulation of CC Amplifier on PSpice by using transient Analysis
NEXT SLIDE SHOWS STEP WISE PROCEDURE OF
Construction and simulation of CC Amplifier in PSpice

14. THANKS
For mini projects visit:
www.cecosee2013b.weebly.com