Preselector for Upconversion

Hello,

I am well informed about the necessity of PRESELECTION (YIG-Filer, ...) when building up Front End Modules for RF-Downconversion.

Has somebody an idea, why such YIG-Filter (tunable bandpasses, Preselectors) are also included in Upconversion Modules (like the one from www.phasematrix.com).

Thanks.

elektr0

To minimize the out-of-band Noise Power.

@vfone. Thanks. I will just use bandpassfilters behind the mixer to cover this aspect.

...

May be you can answer another strongly related question.

Within the 26.5GHz...MHz downconverter I will try to first mix up MHz....7GHz up to 7.5 GHz and then mix down to MHz after bandpass filtering.

The remaining frequency band 7...26.5 GHz is downconverted in two stages. It would be nice to also use 7.5 GHz as first IF.

But what to do with the band 7...8 GHz. I cant find any mixers, which can handle such small frequency conversion. Lets say from 7(IN) to 7.5(OUT).

Any comments ?

Thank you.

elektr0

Try this manufacturers:

http://www.hittite.com/products/index.html/category/41
http://www.macom.com/psc/jsp/ListPar...ile=mixers.txt
http://www.spectrummicrowave.com/mixers.asp

Thank you vfone.
But I already know this companies, and its hard to find the right devices.

Well, we now have to deal with IF signals starting at DC (DC...100MHz).

Then we actually DO have problems with the (f_LO-f_IF) mixing product on the output port of the upconversion module.
How is it normally solved. YIG filters ?

Thanks