ADL5610 and ADL5611 EVALZ

I´ve buy the EVALZ for the ADL%&10 and 5611 amplifiers, and I´ve made my own PCB for testing the same amplifiers. At the same time I have the ADL5545-EVALZ and my own PCB. In the last cases with the ADL5545 I obtain similar results with the EVALZ and my own PCB than in the datashet or Sparameter given by Analog Devices. In the first two cases with the ADL5610 or 5611 amplifiers I obtain 10 dB lower gain than expected, because the datashet predicts 20 dB of gain and the measurements of both PCB and EVALZ boards of both ADL5610 and ADL5611 amplifier shows near 10 dB of gain.

Do you know if there is a problem with these amplifiers?

Regards

  • 0
    •  Analog Employees 
    on Oct 4, 2015 10:46 PM

    Hi Amparo,

    I moved your question to RF and Microwave community. Someone from here will be able to help you out.

    Regards,

    Jino

  • Thanks a lot!!! I planed to use this amplifiers on the Master on Electronic Engeneering on wich I am teacher. I am preparing the practical classes. And the problem is the performance of both cases compared with the teoretical response, that is imposible to explain.

  • 0
    •  Analog Employees 
    on Oct 9, 2015 3:39 PM

    Hi Amparo,

    The applications engineer who supports the ADL5610 and ADL5611 products is on vacation until this coming Monday, but I can try to help you in the meantime. Please provide a schematic of your circuit and describe your operating conditions (Temperature, frequency, RF Pin, supply voltage and measured current, etc.), how the gain was measured, etc. If any of those details are sensitive, let me know and we can arrange for you to convey them to us outside of the public forum.

    Regards,

    SMcBride

  • Thanks a lot,

    I used firt the ADL5610-EVALZ board, that is completelly mounted by Analog Devices, the schematic is the povided on the datasheet, the operating conditions is near 5 Volts for the voltage, and more than 100 mA for the current, and -15 dBm of input power. I measured the Sparameters with N9923A FielFox RF vector Network Analyzer.

    THe same for the ADL5611EVALZ and ADL5545-EVALZ.

    Measurement conditions are always small-signal one.

    Then my own PCB was made on RO3210 Rogers substract with H=50 mils, in order to obtain more or less the same with for the 50 Ohms input and output lines, and in fact the results of the measurements are the same than the obtained with the EVALZ evaluation boards. That is in the ADL5545 cases (EVALZ and my board) the measurements are quite similar, and the fit well with the expected S parameter given by Analog devices, I´ve made EM simulation of the board and they fit quite well to.

    But in the cases of the ADL5610 and ADL5611, the measurements of the EVALZ and my board are quite similar, but differ on 10 dB with the Sparameter given by Analog Devices or the Datasheet.

    I think that the measurement procedure is OK because is always made in the same way, and in some case is OK (ADL5545 boards) and for the other four is wrong....

    Here you can see the schematic I use for the simulations with the board and the

    When I compare S param alone (in red) with the Sparam including real input and output capacitor (in blue) and then including the polarization network (in cyan) is posible to see 2 dB of diminution on the gain, ( in pink is possible to see the influence of taking into account the PCB) But the problem is that I observe a diminution of 10 dB ( I havent stored the measurement but If you want I can do it for you)

  • 0
    •  Analog Employees 
    on Oct 12, 2015 7:29 PM

    This is unusual -- certainly not aware of any issues with the ADL5610 or ADL5611. In order to better assist you, can you provide additional information listed below:

    1) Are you experiencing lower gain with the ADL5610-EVALZ and ADL5611-EVALZ, the official product evaluation boards?

    2) Is the network analyzer calibrated?

    3) The schematic attached isn't legible. Can you provide a separate attachment with a clear schematic and layout? What kind of a choke inductor are you using and how many ground vias are laid out under the exposed paddle of the device?

    4) Do you notice any unusual patterns in the current consumption of the amplifier, or is it steady at around 100mA at all times?