How to get desired values of Delivered Power and PAE of PA using ADS

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pusparaga

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I have designed Power Amplifier at 2.4 GHz using Cree Transistor CGH40025F in ADS. I am not getting desired output of Delivered Power(Pdel_dBm) and Power Added Efficiency (PAE). I wanted to get desired Delivered Power 41.255 dBm and PAE 56.840. But I have tried a lot. I don't know where I am making mistake. Below I have attached relevant screen shots.
1. Obtained Output
2. Desired Output
3. Schematic
4. Optimum Values of ZS and ZL
5. Datasheet
 

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  • Schematic.jpg
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  • Optimum_Value_Zs_and_ZL_Values.jpg
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  • Data_CGH40010F.pdf
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  • Obtained_Ouput.jpg
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Hi,

It seems that in your schematic you don't put the input matching network and the output matching network.
You have to matched the 50Ohm to your Zs (conjugate matching), and also do a power matching to ZL at the output of the transistor.

Also, How did you do the load pull? According to datasheet Zs and ZL at 2500MHz (frequency closed to yours) are a quite different tham your Zs and ZL.

Regards
 

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Dear Friend,
I watched the following Video and designed PA. Exactly I followed steps which he discussed in the Video.
I have already done load pull analysis. From load pull analysis only, I have got optimal Zs and ZL (Screen shot of optimal value of Zs and ZL are shown in posting #1). I have kept optimal values of Zs and ZL at the source and load and am not getting the desired PAE and Power Delivered.
 

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OK, maybe your load pull is ok. But I don't see Zs and Zl values included. In Term 2 your Z has to be ZL (not 50Ohm) and at your generator Z has to be Zs.
 

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psach27 said:
OK, maybe your load pull is ok. But I don't see Zs and Zl values included. In Term 2 your Z has to be ZL (not 50Ohm) and at your generator Z has to be Zs.
Click to expand...
I have attached changed schematic and obtained results.
 

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  • Schematic.jpg
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  • Obtained_Results.jpg
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psach27 said:
Why do you put the 5 Ohm resistor?
Click to expand...
That is connected for getting stability of the amplifier. Without connecting series 5 Ohm resistor with gate, we will never get stability.
I am not getting solution for my problem.
 

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pusparaga said:
That is connected for getting stability of the amplifier. Without connecting series 5 Ohm resistor with gate, we will never get stability.
I am not getting solution for my problem.
Click to expand...
Then I suppossed that the load pull is done with that resistor. Is it true?
Send pictures of the load pull analysis that you have done.
 

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Have you ever supplied Load and Source Impedances AND the Bias Current that have been mentioned in datasheet ??

 

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psach27 said:
Then I suppossed that the load pull is done with that resistor. Is it true?
Send pictures of the load pull analysis that you have done.
Click to expand...
I have attached screen shots that load pull is done with 5 Ohm resistor.
BigBoss said:
Have you ever supplied Load and Source Impedances AND the Bias Current that have been mentioned in datasheet ??

View attachment 185260
Click to expand...
BigBoss Sir,
I have supplied ZS, ZL and Bias Current as shown in the Datasheet Values. Still I am getting the poor results. One more thing I would like to discuss with you. I have attached the Anurgha Bhargav Practical Power RF Amplifier Design-16 PDF. I have practiced how he has shown in the youtube. Upto Page No. 33, it is working exactly same as he said in the youtube. When it comes after Page no. 34, it is giving poor results and when we have used ZS and ZL optimized values. Anurag Bhargav PDF is attached .
--- Updated ---

I have attached DC Biased screen shots
 

Attachments

  • Load_Analysis_ZS_ZL_Datasheet_Values_Results.jpg
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  • Load_Pull_Analysis_ZS_ZL_Datasheet_Values.jpg
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  • Load_Pull_Analysis_Results.jpg
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  • Load_Pull_Analysis.jpg
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  • Anurgha_Bhargav_RF_Design_16_Tutorial.pdf
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  • Data_Sheet_DC_Bias_Values.jpg
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I think your model i not correct. I have used Wolfspeed's ADS Library and the results are fine with a quick simulation.You should request to Wolfspeed to access customer portal to get this DK.


 

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BigBoss said:
I think your model i not correct. I have used Wolfspeed's ADS Library and the results are fine with a quick simulation.You should request to Wolfspeed to access customer portal to get this DK.
View attachment 185271

View attachment 185272
Click to expand...
BigBoss Sir,
I am very happy to see your results. You got excellent results. As I said earlier the same transistor is working fine upto Page No.33. Anyhow let me check and get back you.
 

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BigBoss said:
I think your model i not correct. I have used Wolfspeed's ADS Library and the results are fine with a quick simulation.You should request to Wolfspeed to access customer portal to get this DK.
View attachment 185271

View attachment 185272
Click to expand...
BigBoss Sir,
I request Cree Vendor to send the DK of CGH40010F once again. Please can you post archive (do not zip the whole project directory) including Design Kit then save this archive as RAR or ZIP. Please post it here, then I can proceed further design part at the earliest.
 

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I have CG2H40010F zip format transistor model. As you said model may not be installed properly or model might have missed some data while installing. How to install properly this transistor to ADS.
 

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  • CG2H40010F_Zip_Format.jpg
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pusparaga said:
I have CG2H40010F zip format transistor model. As you said model may not be installed properly or model might have missed some data while installing. How to install properly this transistor to ADS.
Click to expand...
CGH40010F is different than CG2H40010F.
I don't know what there is in rar file, if there is a DK, unzip it and install using ADS.
 

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BigBoss said:
CGH40010F is different than CG2H40010F.
I don't know what there is in rar file, if there is a DK, unzip it and install using ADS.
Click to expand...
As you told I did. Truly I am getting amazing results. I have modified schematic as you have shown in the previous post and have changed Power Source and Power Load instead of I_Probe at the Source and Load. I am getting same results as you have shown in the previous results graphs. But I am not getting proper efficiency. Efficiency I am getting 9.574E4. It is too large and is unbelievable. Somewhere went wrong. I couldn't understand where I made mistake. If I get the efficiency correct, everything ok.
 

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  • Schematic.jpg
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  • Obtained_Results.jpg
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Not SRC1.i , it has to be SRC2.i
Your schematic has different source name. Be careful..
 

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BigBoss said:
Not SRC1.i , it has to be SRC2.i
Your schematic has different source name. Be careful..
Click to expand...
Yes absolutely right. I made change. Now I am getting efficiency nicely and attached below.
 

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  • Efficiency.jpg
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