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Here is the latest installment of the LNA Design Series on my Blog. We take a look at thermal analysis and briefly discuss deratings.
Check it out if you are interested here.
Regards,
Joel Richard
https://www.rfdesignhq.com
Isn`t this a pretty big deal?
The matching is a big part of the transmission measurement. Why not measure all port combinations as I mentioned earlier? It provides you the accuracy of a network analyzer which is important when measuring filters.
If you are limited to two ports then you could terminate the unused ports to 50 ohms and measure every combinations of ports and build the S4P file from the data.
eg, S11,s12,s13,s14,s21,s22,s23,s24, etc....
I think ADS has a tool set for handling these files to create the touchstone file for...
Push pull could allow you to meet your requirement with a lower power therefore less costly device. However, I don't know if that would be enough to offset the cost of a second device.
I wish you luck.
Joel
If you use a push-pull configuration you could reduce the transformation ratio. The impedance transformation ratio of the balun is often 2:1 so the matching circuit can be simplified. ie. Matching from a 25-ohm source to a 1.6-ohm load vs a 50-ohm source to a 1.6-ohm load is easier.
"when you do the input match of the PA, the output IL loss goes to -1.8dB."
I would like to know if the above is true because if you did the load pull for input and output simultaneously the output match loss would not be affected by the input match in this way. This assumes you are not...
"But we have already tested the load pull of the PA with VSWR=3/4/5, and in any condition, the 2H is less than -47dBm."
This should have provided you the right answer. I'm curious to know how you measured the power level of the 2nd Harmonic while the PA was miss-matched. Did you use...
This should work just fine but try to keep the transition from micro-strip to coax as short as possible. Do not allow for the center conductor of the coax to be exposed more than you need for soldering purposes to avoid parasitic or unintentional inductance in the line. Not all coax provides a...
Hi Everybody,
The evaluation of the Balanced ATF-50189 linear amplifier in a simulated environment is now complete and the results are published here: https://www.rfdesignhq.com/2013/04/LinearLNAPage1.html
Cheers,
Joel
Hi everyone,
I just wanted to let you know that my weekly Blog post is up and it's about the matching of the ATF-53543.
Check it out here. https://www.rfdesignhq.com/2013/04/lna-design-tutorial-6-atf-53543.html
Cheers!
Joel Richard
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