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Problem with Crystal Filters - IMD - RF Cafe Forums
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jom
Post subject: Problem with Crystal Filters - IMD Posted: Thu
Dec 04, 2008 10:52 pm
Captain
Joined: Fri Jan 26,
2007 2:40 am
Posts: 14
Anyone have a problem with IMD with crystal
filters? I'm not quite sure what to do about it. I have a 100 MHz BPF
with 15 kHz or so BW. It is pretty much the driver for the IMD in the
radio chain. I could move around the gain distribution but the filter
doesn't have a constant IP3 like most amplifiers. The IMD3 really doesn't
drop at the 2 for every 1 rate.
Is this a common problem with
crystal filters?
jom
Top
IR
Post subject:
Posted: Mon Dec 22, 2008 5:34 pm
Site Admin
Joined:
Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
I would
check the impedance match of the crystal to the amplifiers in the chain.
It can be that this behavior is derived by impedance mismatch of the
IMD products compared to a good impedance match of the fundamental signals.
Just my guess...
Posted 11/12/2012
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