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Analog switch for 100Mhz

RMed
on Jan 19, 2015

Dear Sir,

I am looking for an analog switch with the following features:

  • Working frequency: 1Mhz to 100Mhz
  • Rdson < 2 ohms
  • low Rdson flatness
  • insertion loss = 0.5dB aprox (from 1Mhz to 100Mhz)
  • Vdd: 10Vdc

I want to use an analog switch IC to disconnect RX circuit in wired communications application. So this IC has to introduce low noise. If it introduces noise, it will be amplified and RX signal will be degradated.

I found ADG1401 but it has high insertion loss for 100Mhz.

Could you recommend me any analog switch for my application, please?

Kind Regards,

Ricardo

  • 0
    •  Analog Employees 
    on Jan 19, 2015 6:33 PM

    Hi Ricardo,

    The ADG14xx series are our low Ron parts that can be powered from up to +/-15V supplies.  Looking at your requirments I think the ADG1401 is the closest that we have but whos IL falls short as you have said.  If you really need an insertion loss of 0.5dB up to 100MHz and < 2 ohms Ron then maybe a more traditional RF switch from Hittite would suit better. 

    Best Regards,

    Eric.

  • 0 on Jan 20, 2015 12:47 PM

    Hi Eric,

    ADG1411 has 2dB insertion loss for 100Mhz. insertion loss is fine up to 1Mhz, but after that it starts to worsen. For this application, the analog switch should have a good frequency response between 1Mhz and 100Mhz.


    The other option that you told me is RF switch. In this case the major part of bandwidth will not use. I found HMC199MS8 (DUAL SPDT RF SWITCH) but the cost is much more expensive. Low cost solution is important for this application too. Do you know other possible solution?

    Kind Regards,

    Ricardo

  • 0 on Jan 20, 2015 12:50 PM

    I am sorry, HMC199MS8 is not correct because it is powered up to 5V. HMC174MS8 can be powered to 10V. Anyway RF switch is much more expensive.

    Kind Regards

    Ricardo

  • 0
    •  Analog Employees 
    on Jan 20, 2015 6:41 PM

    Hi Ricardo,

    I have checked our analog switches and there really isn't anything suitable that will have less than 0.5dB insertion loss at 100MHz with very low Ron.  The only part that is closer to these is the ADG772 but that only runs with <5.5V power supply.

    Regards,

    Eric.