Can I use ADG801to switch DC bias of Gain block?

Hi,

I am designing a RF transmitter/ receiver system. While in receive mode (which is default mode) all the RF devices (amplifiers) of the transmitter chain need to be in off state. They will be switched ON only when in transmit mode.

Generally I use MOSFET & BJT combination to switch the DC supply for RF devices (amplfiiers).

In case of gain amplifier (low RF power devices) I want to use ADG801 or similar device because this gain amplifier needs only 150mA (max) at 5.0V. ADG801 will help me in reducing the BOM as well as occupy less space & easy functioning.

Kindly give your suggestion on this approach.

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  • Hi Eric,

    Thanks for the reply.

    In the figure (in my very first post) , I have tried to describe my circuit using a generic RF amplifier block diagram. I have not inserted MNA-6A+ specific application circuit in this figure.

    Yes there is a specific resistor requirement in case of MNA-6A+ device & we are designing RF card as per manufacturer's recommended application circuit.

    HMC375 frequency of operation is not matching with our project's frequency band.

    Still we have not finalized the DC on/off scheme for this RF amplifier due to long Turn ON  & Turn off Timings of Load switches. Plz check my last post for details.

    Plz share suggestions on using ADG801 to turn on/off this amplifier.

    Regards,

    Rajan

Reply
  • Hi Eric,

    Thanks for the reply.

    In the figure (in my very first post) , I have tried to describe my circuit using a generic RF amplifier block diagram. I have not inserted MNA-6A+ specific application circuit in this figure.

    Yes there is a specific resistor requirement in case of MNA-6A+ device & we are designing RF card as per manufacturer's recommended application circuit.

    HMC375 frequency of operation is not matching with our project's frequency band.

    Still we have not finalized the DC on/off scheme for this RF amplifier due to long Turn ON  & Turn off Timings of Load switches. Plz check my last post for details.

    Plz share suggestions on using ADG801 to turn on/off this amplifier.

    Regards,

    Rajan

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