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.
Model of noise interference in a ToF application