EMI Suppression Filters (EMC and Noise Suppression)ToF Noise Suppression (2)

Contents

As shown in the figure below, a large current suddenly flows through the driver circuit when a steep, high-output pulse is emitted, and this can easily cause a large voltage spike to form on the power line.
There is a concern that the noise generated in this way could interfere with the receiver and degrade the sensitivity of the ToF sensor.
Most noise emissions can be prevented with shielding, but it is also necessary to take measures to prevent conduction of noise via the power line.
In this section we introduce an EMI filter as an effective way to suppress noise conduction.

Inserting ferrite beads is an effective way of dealing with noise issues of this sort.
By inserting ferrite beads near the VCSEL and laser driver, it is possible to reduce the amplitude of noise spikes that leak into the power line.
In addition, by inserting ferrite beads in the ground line between the transmitter and receiver, it is possible to prevent noise from being transmitted via the ground.

Selected with an awareness of noise frequencies that can easily cause problems.
Select the optimal part numbers to match the available mounting space.