Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Problem with Crystal Filters - IMD Posted: Thu
Dec 04, 2008 10:52 pm
Joined: Fri Jan 26,
2007 2:40 am
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
Posted: Mon Dec 22, 2008 5:34 pm
Mon Jun 27, 2005 2:02 pm
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...