What is the noise figure of the GPS LNA inside the Qualcomm RFR-3300 chip? |
Clarification of Question by
mcmahad-ga
on
14 Nov 2002 09:32 PST
This answer should include documentation as to the source of the
information. Printed data sheets or other hardcopy is ideal,
estimates or guesses are not. Practical experience is acceptable, but
I will need to speak with the source.
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Request for Question Clarification by
sgtcory-ga
on
14 Nov 2002 09:55 PST
Hello mcmahad,
This is a tough one indeed. All I was able to locate so far is this :
"The RFR3300 device meets cascaded Noise Figure (NF) and Third-Order
Input Intercept Point (IIP3) requirements of IS-98 and JSTD-018 for
sensitivity, and two-tone intermodulation...."
http://www.qualcomm.com/press/pr/releases2000/press283.html
I am not sure if this pinpoints the accuracy you are looking for. Are
you needing the exact specification?
Thanks in advance,
SgtCory
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Clarification of Question by
mcmahad-ga
on
14 Nov 2002 10:11 PST
Yes, I know it is tough. That's why I am willing to pay.
I found the document you are refering to before posing the question.
The IS-98 specification is a CDMA cellular radio spec, which this part
complies to in the cellular LNA. It doesn't have a GPS specification
for noise. The document you found also says "...meets the sensitivity
requirements of gpsOne." I haven't been able to find these defined,
either. The problem with the gpsOne sensitivity is that it includes
all kinds of other things in the mix (I can go into if you want to,
but it's kind of technical). I want just the LNA noise figure.
I would like the exact spec, or something that can convince me that
the noise figure you provide is based on some credible direct
information. I'm very flexible on what I will accept, as long as it
is right.
-dave
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Request for Question Clarification by
webadept-ga
on
01 Dec 2002 16:49 PST
Hi,
I had my answer pulled because I couldn't find a true claim for the
db. I found some papers and suggested methods of calculating this, but
I didn't feel that was what you were looking for. So we'll let someone
else give it a try.
Thanks, and I'm sorry I couldn't nail it for you.
webadept-ga
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Request for Question Clarification by
feilong-ga
on
01 Dec 2002 17:32 PST
Hello Mcmahad,
I found info from what seems to be reliable sources. The first one
states the frequency of the RFR3300 receiver at which it operates in
the cellularband, PCS band and PSband. The second reference contains
the architecture of the GPS receiver and antenna, the patch antenna,
GPS receiver filtering. It has specifications for both the RFR and
IFR. I am not well versed on this thing but since you are asking I
need to tell you what I found. In any case, you can contact the second
source that might be able to give you more info regarding your query.
I'm putting this as a clarification because as I said, I am not well
versed on this matter, so in case you want to accept this, I can only
give you the links to the file and the source as the answer. I cannot
elaborate on the matter further.
Feilong
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Request for Question Clarification by
vinods-ga
on
02 Dec 2002 00:10 PST
Hi,
Forwhat it's worth,
[ http://www.cdmatech.com/solutions/pdf/rfr3300.pdf ]
warm regards
vinods-ga
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Clarification of Question by
mcmahad-ga
on
02 Dec 2002 07:49 PST
Feilong,
Those documents don't provide sufficient information to compute the
actual design value noise temperature. They are specifications that
describe what the part (and other parts that do the same job) have to
meet for the cellular band. I am interested in the GPS band, and the
specs aren't as precise. This is a measured or designed value that
you have to know. It can't be deduced from the specs I have found on
the web.
-dave
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Request for Question Clarification by
feilong-ga
on
02 Dec 2002 08:11 PST
Mcmahad,
The document I found that has the product specifications of the RFR
and IFR chips are from Qualcomm. Since you are saying that you already
saw them, it would be helpful for other researchers if you could
provide a list of the references you already found so that they will
know what they need to skip when searching. Thanks.
Feilong
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Clarification of Question by
mcmahad-ga
on
02 Dec 2002 19:05 PST
Feilong,
There was a very nice background of information that webadept-ga
posted with these documents in them. Unfortunately, they were pulled
when he had his answer removed.
The basic documents and product spec sheets containing general purpose
information can be found doing a Google search on "RFR3300 noise" and
"RFR3300". I have also seen the product sheets on the MSM5200 (this
is the chip that works with the RFR3300) and the RFR5200. I could
give you multiple web pages that show what I have looked at before I
wrote the question.
I am definately not saying I found _ALL_ the documents for this chip.
However, I have looked at many of them. References to specification
and standard compliance is not what I am looking for. I need a very
specific numeric value.
-dave
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Request for Question Clarification by
vinods-ga
on
05 Dec 2002 23:41 PST
Hi,
Here is the response from Qualcomm to my mail enquiry.
"Mr. Vinod,
Thanks for your interest in Qualcomm's CDMA Technology Chip Sets.
Unfortunately, any information other than you can find on our web site
is Proprietary to Licensees.
Here is the Qualcomm web site.
http://www.cdmatech.com/sitemap.html
Regards,
Diane"
warm regards
vinods-ga
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