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DSO sampling speed Q. - RF Cafe Forums
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Post subject: DSO sampling speed Q.
Posted: Sun Oct 03, 2010 10:00 am
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Joined: Fri Jul 16, 2004
4:12 pm
Posts: 8 |
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I need to buy a DSO for probing some RF paths at
around 460 MHz. The signals are QPSK at around 100
kbps. I'm not real familiar with DSO sampling requiements.
The scope manufacturer guidelines seem to suggest
a BW at least 4x the highest frequency to be measured,
so than means around 2 GHz. That's a pretty expensive
DSO.
Can I mix the sampled RF down first
either to baseband or some IF and expect to get
a good representation of the original signal? Of
course that would mean making sure the conversion
was done properly, but are there any good reasons
to go ahead and sheel out the dinaros for an expensive
scope vs. downsampling and using a less expensive
scope? Thanks.
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| SunshineDesign
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Post subject: Re: DSO sampling speed Q.
Posted: Wed Oct 06, 2010 10:54 am
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Joined: Sat Nov 08, 2008
11:35 pm
Posts: 30
Location: Ramona, CA
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No reason to by 2GHz Oscope. You can downconvert
and sample with a much lower cost digitizer. National
makes some nice digitizers that give you resonable
Spectral Analysis results. Just make sure you downconvert
to a frequency range that gives you the full modulated
bandwidth.
_________________
Sunshine Design Engineering
Services
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Posted 11/12/2012
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