Hi Everyone: Is there any information on the IP3 of Flex 900 boards. I was not lucky to find any specification documents on the boards. I tried doing some experiments to find out the IP3 and my results show 37.5dBm, that is a good figure. I am not too sure whether it really is so high. If anyone could please help me with any information that you may have regarding the IP3 of Flex 900 boards, to that matter any other board will also give me a decent idea about these boards. Thanks loads in advance. Kind regards, Shabbir -- View this message in context: http://www.nabble.com/IP3-of-Flex-900-boards-tp228... Sent from the GnuRadio mailing list archive at Nabble.com.
on 2009-04-05 07:16
on 2009-04-07 19:26
sHabzbd wrote: > regarding the IP3 of Flex 900 boards, to that matter any other board will > also give me a decent idea about these boards. The IP3 is a function of the gain setting you choose. But in any case, your measurement of 37.5 dBm sounds very optimistic for any radio. Matt
on 2009-04-07 22:11
Thank you Matt. The IP3 measurement that I did was with 0 gain. I was thinking that the value was very optimistic. Was hoping someone had a value for it. Regards.
on 2009-04-09 15:52
Well i have attached my experiment calculation for IP3. Regards, Shabbir
on 2009-04-09 16:02
I am not sure whether the last email went through since the size of the attachment was more than 100K. Anyhow here is the attachment. Which shows my experiment results for calculating IP3. I did make a mistake in interpreting my experiment datas earlier. The IP3 seems to be only 10dBm for the Flex 900 cards. Regards, Shabbir
on 2009-04-11 04:41
The IP3 of the receiver. Sorry, I should have mentioned earlier. Shabbir
on 2009-04-11 05:54
OK, that makes sense. I was assuming you meant receiver IP3, but when you labeled something as OIP3, it made me think you meant the TX. Typically, for a device like an amplifier or mixer, the manufacturer will quote it in either IIP3 or OIP3, depending on which sounds better :) Amplifiers have gain so the OIP3 is a bigger number, so they quote that. Passive mixers have loss, so the IIP3 is a bigger number, and they quote that. Typically, for a complete receiver system, IIP3 is the number quoted, and for a complete transmitter OIP3 is quoted, since those are the measuring points. In any case, +10 dBm for the IIP3 of the receivers is about in line with reality, and is a very good number (if I do say so myself :) for a system like this. This will of course change with gain settings, in any case. Matt