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Lab 4 Ecd 190994

The document outlines Lab #4 focused on the common collector amplifier, detailing objectives such as DC analysis, circuit simulation in Proteus, and hardware implementation. It describes the common collector configuration, its properties, and the aim of amplifying input signals with minimal distortion. The lab concludes with a calculation of current gain, demonstrating the relationship between output and input currents in the circuit.

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19 views4 pages

Lab 4 Ecd 190994

The document outlines Lab #4 focused on the common collector amplifier, detailing objectives such as DC analysis, circuit simulation in Proteus, and hardware implementation. It describes the common collector configuration, its properties, and the aim of amplifying input signals with minimal distortion. The lab concludes with a calculation of current gain, demonstrating the relationship between output and input currents in the circuit.

Uploaded by

jvbantugan34
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Lab # 4

Common Collector Amplifier


Objective:
 DC analysis of the common emitter amplifier circuit
 Simulation of the circuit in Proteus
 Hardware Implementation of the circuit

Components Required:
 Function Generator
 Power Supply
 Oscilloscope
 Digital Multi meter
 BJT (npn 2N3904)
 Resistors
 Capacitors

Description:
There are three basic configurations for implementing single stage BJT amplifiers.
a) Common Emitter
b) Common Collector
c) Common Base
In each case one terminal is common to both input and output signal.

Common Collector Configuration:

In electronics, a common-collector (also known as an emitter follower or voltage


follower) amplifier is one of three basic single-stage bipolar junction transistor (BJT)
amplifier topologies, typically used as a voltage buffer.
Common Collector Configuration
In this circuit the base terminal of the transistor serves as the input, the emitter the
output, and the collector is common to both (for example, it may be tied to ground
reference or a power supply rail), hence its name. The properties are a high input
impedance, a very low output impedance, a unity (or less) voltage gain and a high
current gain.
The aim of any small signal amplifier is to amplify the entire input signal with the
minimum distortion possible to the output. In other words the output signal must be
an exact reproduction of input signal but only bigger (amplified).

Circuit Implemented:

Figure 1
Oscilloscope:

Figure 2

CURRENT GAIN
 Output voltage=0.2V
 Output Current=0.2/1k=0.2mA
 Input Current=0.006Ma
 Ai=Iout / Iinp=0.2Ma/0.006Ma
 Ai=3.33

Conclusion:

Here in this lab we know how to determine current gain while in case of common
collector where voltage gain is very close to zero so we use transistors or function
generators or DC supplies to determine current gain.

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