Transcript operation amplifier circuit templates

Operational Amplifier Circuit Templates
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AInc.
Pre-presentation Self Assessment Activity
Your comfort level with your response
to the following four question
assessment tool should indicate if the
presentation that follows will increase
you knowledge base on the topic
outlined by the questions in this tool.
Pre-presentation Self Assessment Activity
1.
What is the general operational rule for an Operational
amplifier?
2.
What is the operational amplifier configuration for a
comparator circuit.
3.
What is the operation amplifier configuration for a
current to voltage converter?
4.
What is the operation amplifier configuration for a
voltage inverting circuit?
Operational Amplifier fundamental knowledge base.
Operational background and pin out for the 741 op amp.
Operational amplifier configuration for a comparator circuit.
Operation amplifier configuration for a current to voltage converter.
Operational amplifier configuration for a voltage inverting circuit.
Operational amplifier configuration for a non-inverting circuit.
Operational amplifier property summary and post assessment
questions.
Operational Amplifiers
have high impedance inputs.
Op Amp
have a low impedance output.
have an output signal that is a multiple of
the input signal ( Op Amp Gain)
Operational Amplifiers work by following one simple rule!!
Create a voltage output signal that is proportional to the
difference of the voltage signals on the input terminals.
Engineers work successfully with Op Amps by following one
simple rule!!
Feed (in various clever ways) the output signal back to
one of the input signals to bring the voltage difference
between the input terminals back to zero.
14
13
12
11
+
V
10
741
9
8
741
Quad amplifier DIP package
741
1
2
741
3
4
V
-
10
6
7
V
+
input 1
+
output
Operational Amplifier
input 2
-
741
(Op Amp)
V
-
Operational Amplifier
(Op Amp)
input section
of op amp
circuit
input 1
+
To
n
input 2
p
n
741
p
n
the rest of
the circuit
n
To the rest of
the circuit
input section
of op amp
circuit
Operational Amplifier
(Op Amp)
input 1
+
To the middle
section of
the Op
circuit
n
input 2
p
n
741
p
n
n
n
output
terminal
p
To the middle
section of
of the Op
circuit
n
output
section of op
amp circuit
input section
of op amp
circuit
Operational Amplifier
(Op Amp)
input 1
+
Output stage (section) of an
operational amplifier is usually
an emitter-follower circuit.
n
input 2
p
n
741
n
output
terminal
p
p
-
n
n
n
output
section of op
amp circuit
Operational Amplifier
(Op Amp)
Output stage (section) of an
operational amplifier is usually
an emitter-follower circuit.
741
n
output
terminal
p
n
output
section of op
amp circuit
Voltage drop
across here
goes up/down
down as
emitter
voltage output
goes up/down.
Operational Amplifier
(Op Amp)
Output stage (section) of an
operational amplifier is usually
an emitter-follower circuit.
Voltage signal at the
emitter goes up/down as
the base signal goes
up/down.
n
p
n
output
terminal
Voltage drop
across here
goes up/down
down as
emitter
voltage output
goes up/down.
Operational Amplifiers work by following one simple rule!!
Operational Amplifier
(Op Amp)
n
n
p
n
n
p
n
output
terminal
p
n
Voltage drop
across here
goes up/down
down as
emitter
voltage output
goes up/down.
Operational Amplifiers work by following one simple rule!!
The circuit components between
the input section and output
section of an operational amplifier
Input 1
Op amps always adjust the signal
at the output terminal if the
voltage difference between the
two input terminals (input 1 and
input 2) is not zero.
V not equal to 0
Input 2
n
n
p
p
n
n
n
output
terminal
p
n
Voltage drop
across here
goes up/down
down as
emitter
voltage output
goes up/down.
Operational
Amplifiers
byconfigured
followingasone
simple rule!!
The Operational
Amplifierwork
can be
a Comparator
circuit.
The circuit components between
the input section and output
section of an operational amplifier
Op amps
always adjust
the signal at
the output
terminal if the
voltage
difference
between the
two input
terminals
(input 1 and
input 2) is not
zero.
input 1
+
Input 1
output
terminal
V not equal to 0 n
p
input 2
n
p
Input 2 Voltage here is only
-
Let’s look at the simplest application
of an operational amplifier.
n
n
n
output
terminal
p
n
zero when the voltage
drop between (across)
input 1 and input 2 is
zero.
Voltage drop
across here
goes up/down
down as
emitter
voltage output
goes up/down.
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Operational Amplifier Comparator circuit
input 1
output
terminal
+
input 2
LED will be ON if voltage
here is zero.
-
V+
Operational Amplifier Comparator circuit
V-
Note:
This time V is zero volts.
Signal from
outside world
enters here.
input 1
output
terminal
+
Vinput 2
LED will be ON if voltage
here is zero.
zero (i.e. when
the voltage drop across
input 1 and input 2 is
zero.)
-
V+
Operational Amplifier Comparator circuit
This low signal has
the same voltage
value as the
selected voltage at
input 2.
V-
input 1
output
terminal
+
VR
Voltage drop
between the 2
inputs is now
zero.
input 2
adjustable
LED will be ON if voltage
here is zero (i.e. when
the voltage drop across
input 1 and input 2 is
zero.)
This setting puts
a desired voltage
at input 2.
V+
Operational Amplifier Comparator circuit
This high signal is
greater than the
voltage value selected
at input 2.
V-
LED becomes reverse biased
and no current is allowed to
flow through it.
input 1
output
terminal
+
VR
Voltage drop
between the 2
inputs is NOT
zero.
input 2
adjustable
LED will be OFF since voltage
here is greater than zero (i.e.
when the voltage drop across
input 1 and input 2 is not
zero.)
-
V+
Comparator Op Amp circuit
V-
Actually, there is, at all times,
always one of three possible
signals at the output terminal of
an op amp configured as a
comparator.
V
+
zero volts
input 1
output
terminal
+
-
V
VR
input 2
adjustable
The output is only at zero
volts when the voltage at
input 1 exactly equals the
voltage at input 2.
-
V+
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Current to Voltage Op Amp circuit
This op amp circuit monitors the
current at input 2 and produces an
output terminal voltage that is the
inverse of the input signal form.
V
input 1
+
IS
input 2
-
The current
signal is applied
to input 2
EE
VO = I
A high
impedance
input
output
terminal
A high
impedance
input
V+
CC
R1
S
R
1
VO
This output is a
voltage signal that
is the inverse of
the input signal.
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Voltage Inverting Op Amp circuit
This op amp circuit monitors the
voltage at input 2 and produces an
output terminal voltage that is the
inverse of the input signal form.
V
input 1
+
R1
Vi
The voltage
drop is
presented to
input 2
input 2
-
EE
A high
impedance
input
output
terminal
A high
impedance
input
This negative sign
indicates output voltage
will be inverted.
VO = - Vi
V+
CC
Rf
R
f
R
1
VO
This output is a
voltage signal that
is the inverse of
the input signal.
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Voltage Non-Inverting Op Amp circuit
V
input 1
Vi
+
This positive
R1
sign indicates
output voltage
will not be
inverted.
input 2
-
-
This op amp circuit monitors the
voltage at input 2 and produces an
output terminal voltage that is the a
non-inverted multiple of the input
signal form.
EE
A high
impedance
input
VO = + Vi
output
terminal
A high
impedance
input
V+
CC
Rf
R + R
f
i
R
VO
This output is a
voltage signal that
is not the inverse
of the input signal.
1
Click here to return to topic menu
Operational Amplifiers
have high impedance inputs.
have a low impedance output.
have an output signal that is a multiple of
the input signal ( Op Amp Gain)
Operational Amplifiers work by following one simple rule!!
Create a voltage output signal that is proportional to the
difference of the voltage signals on the input terminals.
Engineers working with Op Amps following one simple rule!!
Feed (in various clever ways) the output signal back to
one of the input signals to bring the voltage difference
between the input terminals back to zero.
Post Presentation Self Assessment Activity
1.
What is the general operational rule for an Operational amplifier?
V+
input 1
output
terminal
+
input 2
V-
If the voltage signal at both inputs are
equal the output voltage is zero volts.
Post Presentation Self Assessment Activity
2.
What is the operational amplifier configuration for a comparator
circuit.
+
-
V+
Post Presentation Self Assessment Activity
3.
What is the operation amplifier configuration for an
current to voltage converter?
V
EE
+
VO
IS
V+
CC
R1
Post Presentation Self Assessment Activity
4.
What is the operation amplifier configuration for a
voltage inverting circuit?
V
EE
VO
R1
V+
CC
Rf
End of Presentation
AInc.