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Does the change on SAW have any potencial quality risk?

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tony_lth

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I ordered a SAW filter, and the saw original spec as the attachment, which is not fit for my requirement.
Then the saw vendor modified the SAW, and got the modified spec.
The vendor said they use laser does the 0.25u change on the saw, and

Because my product is for high-speed railway, and has very high requirement on quality,
I wonder if the saw modify have potencial risk on quality?
 

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I recommend you not to take this risk.Use a more reliable and self confident manufacturer.
 
you need to ask them!
It may be a standard manufacturing trimming technique to laser ablate metal off of the surface of the SAW filter. Precision resistors are commonly trimmed this way.
The question to ask them...is this a standard method of theirs, are they controlled for manufacturing processes (such as ISO certified, or provide SAW filters to Mil-Std quality), and if these SAW's were manufactured in accordance with all the required steps and quality controlled inspections and tests.
If so, get them to put that in writing.

You might get a few saw filters, put them in a test fixture, test, then burn them in at 125 deg C for a week, and compare test data before and after. Any shift in RF performance, especially increased insertion loss, will tell you if the process was not a stable one.
 

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