Subject Name: E N A (lab)

Mini Project Name: To verify the characteristics of CC Amplifier

Group Members:

AMIN UR REHMAN ALI KARIM

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.

+

CONSTRUCTION OF CC AMPLIFIER:

Components used:

Resistors:I.R1 =9.98 k ΩII.R2 =450 ΩIII.RE =475 ΩIV.RL =50 ΩTransistor:I.NPN (Q2N2222)Capacitors:I.C1 = 10 uF II.C2= 10 uF

50475

9.98k

450

+20 V

AC 0vVoff 0VVampl 80mVfreq 900HzPhase 0

Q2N2222

10uF

10uF

Common Collector Circuit Diagram:

AC Equivalent Circuit Using model ᴫ model:In AC Equivalent Circuit all the DC sources are replace by short circuit

Β(re/+re)

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

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.

COMMON COLLECTOR, EMITTER FOLLOWER TRANSISTOR AMPLIFIER CHARACTERISTICS

PARAMETER CHARACTERISTICS

Voltage gain Zero

Current gain High

Power gain Medium

Input / output phase relationship

0°

Input resistance High

Output resistance Low

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

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