Re: [Discuss-gnuradio] IP3 of Flex 900 boards

[Matt Ettus]

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


Shabbir Ahmed wrote:
> The IP3 of the receiver. Sorry, I should have mentioned earlier.
>
> Shabbir
>
> On Fri, Apr 10, 2009 at 7:49 AM, Matt Ettus <address@hidden 
> <mailto:address@hidden>> wrote:
>
>
>     It is not clear to me whether you are talking about IP3 of the
>     transmitter or IP3 of the receiver.
>
>     Matt
>
>
>     Shabbir Ahmed wrote:
>
>         Well i have attached my experiment calculation for IP3.
>
>         Regards,
>
>         Shabbir
>
>         On Sun, Apr 5, 2009 at 3:14 PM, sHabzbd <shabbirahmed.bd
>         <http://shabbirahmed.bd> <http://shabbirahmed.bd>@gmail.com
>         <http://gmail.com> <http://gmail.com>> wrote:
>
>
>            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-tp22890626p22890626.html
>            Sent from the GnuRadio mailing list archive at Nabble.com.
>
>
>
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>
>
>         -- 
>         Shabbir Ahmed
>         PhD. Student
>         Centre for Telecommunications and Microelectronics
>         Victoria University
>         Email: address@hidden
>         <mailto:address@hidden>
>         <mailto:address@hidden
>         <mailto:address@hidden>>
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> --
> Shabbir Ahmed
> PhD. Student
> Centre for Telecommunications and Microelectronics
> Victoria University
> Email: address@hidden <mailto:address@hidden>
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