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How to compare the PIM Level from different test freq? - RF Cafe
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| S7_Vulcan
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Post subject: How to compare the PIM Level from different test freq?
Posted: Tue Jan 29, 2008 5:33 pm
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Joined: Tue Jan 29, 2008
5:22 pm
Posts: 2 |
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I got a question about PIM test result.
PIM
test is done by using two tones test. However, the
frequency of the two tones are not standardized.
Let's say we have two sets of test results from
two different companies and they are using different
frequency setting (one for 869 MHz & 891 MHz,
the other for 1100MHz & 1900 MHz). Their results
have the same PIM level.
Which one will
be better? and Why?
* I am assuming the
one with higher freq tones will be better, because
of the skin-effect, but I have a hard time to find
any document to approve the relationship between
testing frequency, skin-effect, and PIM level.
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FSomma |
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Post subject:
Posted: Tue May 20, 2008 4:57 pm
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Hi,
PIM means passive intermodulation, and
it refers to in-band spurious tones, so you should
perform the test with the tones on the frequencies
on which your device normally works... if your device
works form 800 to 900MHz, you should perform the
test with the one with the tones inn 869 MHz &
891 MHz...
In the case that your device works
from, let´s say: 600 to 2000MHz, then both measurements
are ok, none of them is more characteristic than
the other one, and if you need to give a product
specification... provide both, explaining each test
conditions.
Hope to be helpful
Bye
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S7_Vulcan |
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Post subject:
Posted: Tue May 20, 2008 5:13 pm
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Joined: Tue Jan 29, 2008
5:22 pm
Posts: 2 |
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Posted 11/12/2012
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