DRV8323: How to suppress power supply noise

Tool/software:

Hi,

I am having trouble with the spatial noise generated by the DRV8323SRTA when the power is on and the FET is not yet operating (no PWM control or SPI communication). Specifically, 45dBμV of noise occurs at a peak of around 100MHz.

The noise is large around pins 20/21 for the IC alone, and large around the power supply + charge pump terminals of pins 1 to 4 in the surrounding patterns (pattern distance is shortest). If a wide area including the IC and surrounding patterns is covered with aluminum foil, the noise is greatly reduced.

From this state, I believe that the VM power supply and charge pump circuit inside the IC are the cause. Is there any way to suppress this noise (capacitor, filter arrangement, etc.)?

Thanks,

Conor