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OIP3-estimatedP1dB - RF Cafe Forums
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Jeanalmira
Post subject: OIP3-estimatedP1dB
Unread postPosted:
Wed May 04, 2005 9:45 pm
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Joined: Tue Mar 15, 2005 11:43 pm
Posts: 65
Location: Singapore
Hi all:
I have questions regarding OIP3 and estimated P1dB.
Currently, I calculate estimated P1dB from DC power, with 50% drain
effciency.
Then OIP3 (dBm) was calculated from IM3 (dBc) based
on the SCL output power. After that, I take a look at OIP3-estimated
P1dB. I understand that the larger the difference shown the better performance.
But at this moment I am not sure, why is it so? what are the theoretical/practical
reasons behind?
Thank you in advance for clearing my doubts.
I'll truly appreciate your advice.
Regards,
Jean
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Post subject:
Unread postPosted:
Thu May 05, 2005 2:52 am
Hi Jean,
A well-known rull of
thumb: OIP3 is 10dB higher than P1dB.
As you know, The OIP3 is
a theoretical point that is obtained by linear extrapolation of the
tangents for both the fundamental and third order curves, until they
meet at a certain output power point - OIP3. The higher the difference
between these 2 points the linear is the amplifier. That means you will
obtain lower IM3 products for a given output power.
Usually,
the OIP3 is measured at the linear region of the device.
If you
have a bigger difference between P1dB and OIP3 that means for a higher
power (higher than which OIP3 is measured) you will obtain lower IM3
products compared to an amplifier with that has a lower difference between
these parameters.
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Jeanalmira
Post subject:
Unread postPosted: Thu May 05, 2005 8:36 pm
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Joined: Tue Mar 15, 2005 11:43 pm
Posts: 65
Location: Singapore
Hi!
Thank you so much for the advice.
Truly appreciated :D
Regards,
Jean :wink:
Posted 11/12/2012
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