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OIP3-estimatedP1dB - RF Cafe Forums

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Below are all of the forum threads, including all the responses to the original posts.


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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Guest
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:



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