Transcript Universal College of Engg. And Tech.

UNIVERSAL COLLEGE OF
ENGG. AND TECH.
ANALOG ELECTRONICS
AIM: OP-AMP AMPLIFICATION, DC AND AC
AMPLIFIERS, SCALING AND SUMMING
AMPLIFIERS
Prepared By:
Group:- 12 (C)
Devansh Dave 130460109011
Parita Bhavsar 130460109007
Guided By:
Prof. Kapil Dave
FLOW OF PRESENTATION
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Op-Amp
TERMINOLOGY
741 Op-Amp
Schematic Diagram of Op-Amp
Inverting Amplifiers
Non-Inverting Amplifiers
Summing Amplifiers
Scaling Amplifiers
OP-AMP
• Op-Amp-An active circuit element designed to
perform mathematical operations of addition,
subtraction,
multiplication,
division,
differentiation and integration.
• High performance linear amplifier that
requires a power source to operate.
TERMINOLOGY
• Gain- Amount of amplification produced by
an Op-Amp. Gain is independent from the
supply voltage (power given for the Op-Amp
to operate).
• Open-Loop Mode-Function of an Op-Amp
when the feedback resistor (Rf) is zero. The
Op-Amp operates as a comparator and not as a
linear amplifier.
TERMINOLOGY
• Comparator-Compares the –V and +V inputs
to see which is greater and returns a result.
• Bandwidth-The range of frequency at which
an Op-Amp will function. (Ideal = ∞)
TERMINOLOGY
• Slew Rate (V/µs)- Amount of time it takes for
the Op-Amp to step to another voltage level.
(Non-Ideal)
• Input Offset Voltage- Even when there is no
input voltage the Op-Amp gives off a small
voltage. This can be canceled out by use of the
Offset Null pin on the chip. (Non-Ideal)
• Common Mode Rejection Ratio (CMRR)Ability of an Op-Amp to reject a signal applied
to both inputs simultaneously.
741 OP-AMP
Maximum Ratings
Supply Voltage
Power Dissipation
Diff. Input Voltage
Input Voltage
Operating Temperature
Characteristics
±18 V
500 mW
±30 V
±15 V
0°C to 70°C
Offset
Null
1
- INPUT
2
+ INPUT
-V
3
4
+
Input Offset Voltage
Input Resistance
CMMR
Bandwidth
Slew Rate
8
No
Connection
7
+V
6
Output
5
Offset
Null
2 to 6 mV
.3 to 2 MΩ
70 to 90 dB
.5 to 1.5 MHz
.5 V/µs
Schematic Diagram of 741 OP-AMP
OP-AMP TYPES
Op-amp
DC
AC
DC OP-AMPS
• In DC op-amps, the output signal changes in
response to changes in its DC input levels.
• A DC amplifier can be inverting, non-inverting
or differential.
• Let us see them in detail
INVERTING OP-AMP
• Here the inverting circuit diagram of Op-Amp
is shown,
INVERTING OP-AMP
• The input is given to the Inverting terminal of
Op-Amp so we get an Inverted output with
180° phase difference and out of phase.
NON-INVERTING OP-AMP
NON INVERTING AMPLIFIER
• The input signal is given to non-inverting
terminal of Op-Amp. The output is without
any phase difference and in phase to input.
DIFFERENTIAL AMPLIFIER
If R1 = R2 and Rf = Rg:
DIFFERENTIAL AMPLIFIER
•
It amplifies the difference between two
voltages but does not amplify the particular
voltages.
• Where Vin+ and Vin- are the input voltages
and Ad is the differential gain
SUMMING AMPLIFIER
SUMMING AMPLIFIER
K CL @" A "
KCL @" A "
i i i i
a
b
c
i i i i
a
f
v
v
v
v
 

R R R
R
a
a
b
c
b
a
a
f
R
R 
R
v   v  v  v 
R
R 
R
f
out
f
a
a
f
b
b
c
f
v
v
v
v



R
R
R
R
out
c
b
c
c
v
b
c
b
out
c
R
R
R

  v 
v 
v 
R
R
R

f
out
f
f
a
a
f
b
b
c
c
SCALING AMPLIFIER
REFERENCES
• Ramakant A Gayakwad, Op-Amps and Linear
integrated circuits, Prentice Hall of India
• K.R.Botkar, Integrated Circuits, Khanna
Publishers
• www.google.com
• www.wikipedia.org
THANK YOU