The highlighted components in Figure 3-8 are necessary for implementation when CM noise is present in the system. Note that capacitors C1, C5, and C6 are not populated, and the schematic as presented in this document is for the handling of differential mode noise only. Common-mode choke, L3, is also not populated. This is shown in the schematic, but typically only ferrite beads or the choke can be implemented, but not both. In this document, beads L1 and L4 are populated instead.

Common-mode components are less forgiving than the components DM counterparts, as population of these components form low pass-filters with the ferrite beads on the outgoing signals of the device, and therefore have the potential to directly affect bandwidth and response capabilities in the signal chain. Starting from the differential mode filter designed above, we now reverse the drive signal and measurement point to simulate the output being driven as per normal device operation. Figure 3-9 shows the setup of the schematic in TINA-TI, while Figure 3-10 shows an AC sweep of the frequency response of the output pin. The simulation shows that, as designed, the filter can have no impact on the output bandwidth of the device for outward bound signals.