Question about ADRF5160

Hello,

I look forward to your reply to the following questions.

With RFC and RF1 in conducting state, input a +40 dBm signal from RFC.

If RF1 is open and the power is totally reflected, can the ADRF5160 fail?

 

With RFC and RF1 in conducting state, a +40 dBm signal is input from RFC.

If the conduction is switched from this state to RF2 (Hot Switching), is there a possibility that the ADRF5160 will fail?

Thank you,

Kazu

  • 0
    •  Analog Employees 
    on May 19, 2021 4:13 PM

    Hi Kazu,

    For the #1 case, since ADRF5160 is bidirectional, it if fine to have RF1 open, however, the reflected power may cause damage to the signal generator. Why do you have to make RF1 open when you select it and apply high power? If it is inevitable, I would suggest you load it to 50ohm;

    For the #2 case, the hot switching power is much lower. Is 40dBm your max input power? How fast will you switch between RF1 and RF2?

  • Hi,

    Thank you for the reply.

    The ADRF5160 is placed in the first stage of the receiver circuit and the limiter for receiver circuit protection is placed behind it.
    When +40 dBm is received, the protective limiter is activated to protect the circuit behind the limiter.
    When the limiter operates, it enters short circuit mode and most of the power is reflected back to the ADRF5160.
    I asked this question because I have had some failures in the past with switch made by other manufacturer.
    The +40dBm is the maximum input power. The switching speed is less than 5us.

    Please let me know if there are any SPDTs that can be used under the above conditions.

    Regards,

    Kazu

  • Hi,

    I'm sorry to rush you, but what SPDTs are available for the above conditions?

    Regards,

    Kazu

  • +1
    •  Analog Employees 
    on May 27, 2021 5:09 PM in reply to Kazu

    Hi Kazu,

    You asked about RF1 open and RF1/RF2 how switching in your first post, and then you mentioned that you would have to make RF1 short. What condition is going to be applied in your application? 

    Generally, can you delay the source and apply +40dBm RF input power after the limiter is in the normal condition instead of short?

  • Hello,

    Thanks for the reply.

    It is not possible to delay the source.
    Most of the 40dBm signal will be returned to the ADRF5160.
    Is there any concern that the ADRF5160 will be damaged under these conditions?

    I understand that hot switching the ADRF5160 at 40dBm is difficult. What is the approximate power at which it can be hot switched?

    Thank you very much for your help.

    Kazu