Single Tuned Voltage Amplifier: Siddhartha Engineering College

VELAGAPUDI RAMAKRISHNA
SIDDHARTHA ENGINEERING COLLEGE

(Affiliated to JNTUK KAKINADA & approved by AICTE)
A MINI PROJECT REPORT OF
Single tuned voltage

amplifier
A MINI PROJECT REPORT

BY
208W1A04L4 : K. ASHOK
208W1A04L5 : K. SRI SAI KIRAN
208W1A04L6 : K. PRASAD
UNDER THE GUIDANCE OF

G. SURYANARAYANA
LECTURER, DEPT.OF ECE

VELAGAPUDI RAMAKRISHNA
SIDDHARTHA ENGINEERING COLLEGE
(Affiliated to JNTUK KAKINADA & approved by AICTE)
CERTIFICATE
This is to certify that the mini project report titled on

“SINGLE TUNED VOLTAGE AMPLIFIER”, being submitted by
K.ASHOK(L4), K. SRI SAI KIRAN (L5), K. PRASAD (L6) impartial
fulfilment for the award of the degree of bachelor of Technology in
ELECTRONICS AND COMMUNICATION ENGINEERING to Velagapudi
Ramakrishna Siddhartha Engineering college, Vijayawada is a record
of a Bonafede work carried out by them under my guidance and
supervision.
Guide
G. Surya Narayana
professor
TABLE OF CONTENTS
➢ ABSTRACT
➢ INTRODUCTION
➢ REQUIRED COMPONENTS
➢ WORKING PROCEDURE
➢ OBSERVATIONS
➢ FREQUENCY RESPONSE CURVE
➢ CALCULATIONS
➢ RESULT
➢ CIRCUIT DIAGRAM
➢ APPLICATIONS
➢ ADVANTAGES
➢ DISADVANTAGES
➢ CONCLUSION
single tUNED VOLTAGE AMPLIFIER
ABSTRACT:
The aim of the project is to develop an amplifier to select a

particular frequency, while rejecting all other frequencies and to amplify the
desired frequency. These are practically used in radios and televisions.
The tuned amplifier is one kind of amplifier that can be used for
selecting or tuning. The selection process can be done between a set of available
frequencies if any frequency to be selected at an exact frequency. The process
of selection can be possible using a tuned circuit. When a load of an amplifier
circuit is changed with a tuned circuit, then this amplifier is named as a
Tuned amplifier circuit. This circuit is nothing but an LC circuit or tank circuit or
resonant circuit. This circuit is mainly used for amplifying a signal over a slight
band of frequencies that are located at the resonant frequency.
INTRODUCTION :
Objective:
The primary purpose of the project is to understand the frequency
response of a single tuned voltage amplifier.The tuned amplifier is one kind of
amplifier that can be used for selecting or tuning.The selection process can be
done between a set of available frequencies if any frequency to be selected at
an exact frequency.
SINGLE TUNED VOLTAGE AMPLIFIER
The single tuned amplifier is a multistage amplifier, which uses a parallel
tuned circuit like a load. But, the LC circuit and tuned circuit in every stage are
necessary to be selected to the same frequencies. The configuration used in
this amplifier is CE amplifier configurations which contain the parallel tuned
circuit. In wireless communication, the RF stage requires a tuned voltage
amplifier to choose the preferred carrier frequency as well as to change the
passband signal which is allowed.
Construction:
The single tuned amplifier circuit diagram using capacitive coupling is shown
below. It is important to notice that for an LC circuit, the value of inductance
(L) and capacitance (C) should be chosen that the resonance frequency of
resonance must be equal to the frequency signal which is applied.
The output of this circuit can be attained by using inductive and capacitive
coupling. But, this circuit uses capacitive coupling. The common emitter
capacitor used within the circuit can be a bypass capacitor while the circuits
like stabilization & biasing follow by these resistors like R1, R2, and RE The LC
circuit used within the collector region acts likes a load. The capacitor is
changeable in order to contain a changeable resonant frequency. Huge signal
amplification can be attained if the input signal frequency is comparable to the
resonance frequency of the tuned circuit
REQUIRED COMPONENTS:
• Transistor BC107 - 1 No.
• Resistors 68kohms -1No, 12kohms -1No, 100ohms -1No.
• Capacitors 47nf -1No, 10µf- 2 Nos,1µf- 1 No.
• Inductor 100 µH -1No.
• CRO (Dual Channel) (0-20 MHz)
• Function generator (1Hz to 1 MHz)
• Regulated power supply (0-30V)
• Breadboard
• Connecting wires.
Circuit Elements and their Functions:
The common emitter amplifier circuit elements and their functions are
discussed below.
Biasing Circuit/ Voltage Divider :
The resistances R1, R2, and RE used to form the voltage biasing and
stabilization circuit. The biasing circuit needs to establish a proper operating Q-
point otherwise, a part of the negative half cycle of the signal may be cut-off in
the output.
Input Capacitor (C1) :
The capacitor C1 is used to couple the signal to the base terminal of the BJT. If
it is not there, the signal source resistance, Rs will come across R2, and hence,
it will change the bias. C1 allows only the AC signal to flow but isolates the
signal source from R2
Emitter Bypass Capacitor (CE):
An Emitter bypass capacitor CE is used parallel with RE to provide a low
reactance path to the amplified AC signal. If it is not used, then the amplified
AC signal following through RE will cause a voltage drop across it, thereby
dropping the output voltage.
Coupling Capacitor (C2):
The coupling capacitor C2 couples one stage of amplification to the next stage.
This technique used to isolate the DC bias settings of the two coupled circuits.
WORKING OF SINGLE TUNED VOLTAGE

AMPLIFIER
Single Tuned Voltage Amplifier Operation:
The single tuned amplifier operation mainly starts with the high-frequency
signal application which can be improved at the transistor’s BE terminal shown in the
above circuit. By changing the capacitor used within the LC circuit, the circuit’s
resonant frequency is made equal to the given input signal’s frequency.
Here, the higher impedance can be given to the frequency of the signal
through the LC circuit. Therefore, a huge o/p can be attained. For an i/p signal with
various frequencies, simply the frequency communicates with resonant frequency so
that it will get amplified. Whereas other types of frequencies will discard the tuned
circuit.
Therefore, merely the preferred frequency signal will be selected & therefore this can
be amplified through the LC circuit.
PROCEDURE:
1. Connections are to be made as per the circuit diagram on bread board properly.
2. Set input signal vi=50mV using the Signal Generator.
3. Keep the input voltage constant and vary the frequency from 10 Hz to 100kHz in
steps as shown in the tabular column and note the output voltage.
4. Plot the graph of voltage gain in dB VS frequency.
5. Calculate the bandwidth from the graph.
OBSERVATIONS :
Input voltage to be kept constant v(i)= 50mv
Tabular form
frequency Gain=(Vo/Vi) Gain in dB= 20log(gain)

1KHz 0.0367 -28.7
5KHz 0.63 -4
10KHz 1.54 3.8
15KHz 2.54 8.1
20kHz 3.5 10.9
25kHz 4.67 13.4
30kHz 6.1 15.8
40kHz 9.4 19.5
50kHz 15.8 24
60kHz 30.1 29.6
F(1)68kHz 89 39
70kHz 177.8 45
73kHz 530.8 54.5
F(2)78kHz 91.2 39.2
80kHz 57.5 35.2
85kHz 33.8 30.6
90kHz 29.8 29.5
95kHz 22.4 27.02
100kHz 17.6 25
FREQUENCY RESPONSE :
CALCULATIONS :
THEORITICAL CALCULATIONS:
L=100 µH, C=47nF
Resonance Frequency, fr=1/2 π √LC=73.412khz
PRACTICAL CALCULATIONS:
Bandwidth=f2-f1=78Khz-68Khz=10Khz
Resonance frequency = 73Khz
RESULT :
Resonant frequency(Th)=73.412khz
Resonant frequency(Pr)=73KHz
Band Width =10Khz
CIRCUIT DIAGRAM :
APPLICATIONS :
The applications of a single tuned amplifier include the following.

▪ This amplifier is used in the primary internal stage of the radio receiver
wherever the selection of the front end can be done using an RF amplifier.
▪ This amplifier can be used in television circuits.
ADVANTAGES :
The advantages of a single tuned amplifier include the following.
▪ The power loss is less due to the lack of collector resistance.Selectivity is high.
▪ The voltage supply of the collector is small due to the lack of Rc.
DISADVANTAGES:
The disadvantages of a single tuned amplifier include the following.

▪ The product of gain bandwidth is small
CONCLUSION:
The fundamental idea of this project is to design a single
tuned voltage amplifier in order to select the desired carrier frequency and
amplify the allowed passband signal during wireless communication.

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VELAGAPUDI RAMAKRISHNA

SIDDHARTHA ENGINEERING COLLEGE

A MINI PROJECT REPORT OF

Single tuned voltage

A MINI PROJECT REPORT

UNDER THE GUIDANCE OF

LECTURER, DEPT.OF ECE

This is to certify that the mini project report titled on

The aim of the project is to develop an amplifier to select a

Circuit Elements and their Functions:

WORKING OF SINGLE TUNED VOLTAGE

Single Tuned Voltage Amplifier Operation:

Input voltage to be kept constant v(i)= 50mv

frequency Gain=(Vo/Vi) Gain in dB= 20log(gain)

L=100 µH, C=47nF

Resonance Frequency, fr=1/2 π √LC=73.412khz

The applications of a single tuned amplifier include the following.

The disadvantages of a single tuned amplifier include the following.

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