(
)
1
out
IN
IN
ref
2
R
V
V
V
V
R
+
-
=
-
+
3
4
1
1
1
out
IN
ref
IN
3
4
2
3
4
2
2
R
R
R
R
R
V
1
V
1
V
V
R
R
R
R
R
R
R
+
-
æ
ö
æ
ö
æ
ö
æ
ö
=
+
+
+
+
ç
÷
ç
÷
ç
÷
ç
÷
+
+
è
ø
è
ø
è
ø
è
ø
Schematic and PCB Layout
www.ti.com
14
SBOU191 – July 2017
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Copyright © 2017, Texas Instruments Incorporated
DIYAMP-SOT23-EVM
The PCB layout of the bottom layer of the single-supply, inverting amplifier circuit configuration is
displayed in
Figure 20
.
Figure 20. Single-Supply, Inverting Amplifier Bottom Layer
3.6
Difference Amplifier
Figure 21
shows the schematic for the difference amplifier circuit configuration.
Figure 21. Difference Amplifier Schematic
The difference amplifier utilizes both inverting and non-inverting inputs and produces an output that is
equal to the difference between the inputs. The gain of the difference amplifier is dependent on the ratio of
the resistor values selected.
Equation 15
displays the transfer function of the difference amplifier circuit configuration.
(15)
If R
1
= R
4
and R
2
= R
3
,
Equation 15
can be simplified to
Equation 16
.
(16)