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How to design the matching network of ADL5324 and ADL5523

Hello!

I am trying to design the tuning the ADL5324 and ADL5523, here is my problem.

Question 1. The Power Amplifier ADL5324 Evaluation Board's default frequency is 2110 MHz - 2170 MHz. But I want it to work at frequency of 3100 MHz - 3400 MHz. Is it possible to simulate the matching network in ADS?  Like the picture shows.

The simulation result seems different from the datasheet. Or maybe I could only modify the component on the board directly?

Question 2. I also want the LNA ADL5523 evaluation board to work at frequency of 3100 MHz to 3400 MHz. As it is a LNA, we want to tune it for optimal noise figure.  But it seems impossible to simulate it in ADS because I looked the SNP file and there is no data about Noise Figure, Fmin, GAMMA OPT. Could anyone tell me how to design the matching network?

Any advice would be apprciate.

Thank you!

Chris

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  • Hi Chris,

                     There is a discrepancy at higher frequencies between the simuled results and the actual results with the ADL5324 S-Parameter model. ( I have not been able to resolve this issue) The shift is about 240 MHz. If were to shift your simulation frequency up 240 MHz, simulate your match and then build your circuit on your board, the frequency response would at your desired frequency.

    Regarding the ADL5521, There are no noise parameters available. Based on the information in the datasheet an acceptable match can be determined for your frequency. See the attached file.

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  • Hi Chris,

                     There is a discrepancy at higher frequencies between the simuled results and the actual results with the ADL5324 S-Parameter model. ( I have not been able to resolve this issue) The shift is about 240 MHz. If were to shift your simulation frequency up 240 MHz, simulate your match and then build your circuit on your board, the frequency response would at your desired frequency.

    Regarding the ADL5521, There are no noise parameters available. Based on the information in the datasheet an acceptable match can be determined for your frequency. See the attached file.

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