c
1
1
1
2
R
C
=
p ´
´
f
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Schematic and PCB Layout
15
SBOU191 – July 2017
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DIYAMP-SOT23-EVM
Capacitors C1 and C4 provide the option to filter the output of the amplifier. The cutoff frequency of the
filter can be calculated using
Equation 17
.
where
•
R
1
= R
4
, R
2
= R
3
, and C
1
= C
4
(17)
The PCB layout of the top layer of the difference amplifier circuit configuration is displayed in
Figure 22
.
Figure 22. Difference Amplifier Top Layer
The PCB layout of the bottom layer of the difference amplifier circuit configuration is displayed in
Figure 23
.
Figure 23. Difference Amplifier Bottom Layer