Multiple Feedback Filter Circuit; Butterworth Filter - Texas Instruments SLOU106 User Manual

Butterworth Filter

Note:
Transformers are used to change the single ended signals to differential
signal or vice versa. On this EVM, they can be populated according to the
application or the experiment. The V
to the center-tap of the transformer, or maybe set via an external source such
as V
source, it will be set at the center point of the power supply. For example, if
2.7 Butterworth Filter
An example of a Butterworth filter implemented with multiple feedback archi-
tecture is provided. The following circuit is implemented on the EVM board.
The following figures represent the circuit configuration and the component
values. The corner frequency of the filter (–3dB) is set at 1 MHz.
For verification of jumper locations and other bypass components, see the
complete EVM schematic in Figure 1–2.
Figure 2–4. Multiple Feedback Filter Circuit
–1 dBm
AC
2-6
of a data converter. If the V
ref
5 sources are used, the V
OCM
787
100 pF
V
CC
732
787
+
THS4140
220 pF
732
–
787
V
EE
100 pF
787
pin of the device may be connected
OCM
pin is not connected to an external
OCM
level will be set to zero.
100
5 V
–
+
100
–5 V
Using the THS4140 EVM