Hi,
We are using IC TPS25921LDR in our product. We are using this IC for overload protection purpose for communication Hub.
According to one of our test requirement, this section should not generate any radiated noise at below frequencies..
Our Desired frequency range is
(i) 420MHz to 426MHz &
(ii) 451MHz to 457MHz
and acceptance level is -97dBm
but we observed that there is emissions from IC in our desired frequency range, with the level of -92dBm against our acceptance level of -97dBm.
furthermore we observed that these emissions have harmonics of 4MHz and refer attached image.
please let us know origin of this emission and how we can filter this.
We need your support on urgent basis, kindly respond as soon as possible (circuit & PCB design are also attached for your reference)
Regards,
Amit
