+
±
C4/7
R3/8
R2/7
R4/9
R5/10
C5/8
OUTA/B
INA/B
V+
C1
REFA/B
C3/6
R1/6
V-
C2
c
3/7
2/5
1
2
C
R
=
´ p ´
´
f
c
4/8
3/6
1
2
C
R
=
´ p ´
´
f
Schematic and PCB Layout
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SBOU193 – July 2017
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DUAL-DIYAMP-EVM
Populating C4/8 with capacitors ac couples the input of the circuit. The corner frequency of the high-pass
filter created by C4/8 and R3/6 is calculated in
Equation 3
:
(3)
Similarly, capacitor C3/7 creates a high-pass filter with R2/5. The corner frequency of the high-pass filter
created by C3/7 and R2/5 is calculated in
Equation 4
.
(4)
Figure 10
displays the PCB layout of the top layer of the non-inverting amplifier circuit configuration.
Figure 10. Non-Inverting Amplifier Top Layer PCB Layout
3.3
Inverting Amplifier
Figure 11
shows the schematic for the inverting amplifier circuit configuration.
Figure 11. Inverting Amplifier Schematic
The inverting amplifier configuration takes an input signal and outputs a signal that is the opposite polarity
as the input signal. The benefit of this topology is that it avoids common mode limitations. The ratio of the
resistors in the feedback network will determine the amount of gain the input signal will be amplified by.
The inverting amplifier circuit configuration provides the option to ac couple the input, filter the output, and
bias the output of the amplifier to a desired value.
