Filter damage problem

刘木木

Filter damage problem [Copy link]

 

Dear experts: When the filter is not in use, the performance is normal when tested with a network divider. After it is installed on the board, its bandwidth range becomes poor and uneven. Is it damaged by excessive input voltage? Or is there another reason?

maychang

"Is it because the input voltage is too large and it has damaged it? Or is it some other reason?" Are you using a passive filter or an active filter? For a passive filter, the possibility of damage due to excessive input voltage is quite small.

dragongtr

LTCC? In the case of LTCC, check to see if cracks were generated during welding.

ddllxxrr

Is it a black plastic package? If it falls, it will basically be ruined.

qwqwqw2088

Is it because the input voltage is too high? How high is the voltage?

chunyang

Go to the filter manual and you can tell whether the problem is caused by excessive input based on the input range.

刘木木

dragongtr posted on 2018-3-1 17:36 LTCC? If it is LTCC, check if there is crack during welding.

This is a test base, so it should not be a welding problem

刘木木

ddllxxrr posted on 2018-3-1 18:01 Is it a black plastic package? ? ? ? If it falls, it is basically useless

If it has not fallen, it is likely to be damaged after testing on the board

刘木木

chunyang posted on 2018-3-1 21:29 Go to the filter manual and you can tell whether the problem is caused by excessive input based on the input range.

It is within the input range, but a part of it is damaged.

chunyang

Liu Mumu posted on 2018-3-3 09:43 It is within the input range, but a part of it is damaged

If there is damage within the allowable input range of the device, then the damage has nothing to do with the input amplitude. Look for other reasons, such as welding process problems.

dragongtr

Liu Mumu posted on 2018-3-3 09:42 It didn't fall, but after testing it on the board, there is a chance that it is damaged

Here's a picture, there's no use in guessing.

刘木木

dragongtr posted on 2018-3-3 14:38 Here is a picture, guessing is useless.

The picture shows normal and damaged