Analog switch for RF

Discussion in 'Wireless & RF Design' started by cam0, Sep 19, 2010.

  1. cam0

    Thread Starter New Member

    Mar 23, 2010
    25
    0
    Hi everybody,

    I am on a project where I have to switch between different filters for different frequencies. Now, the solution I have not to alter the signal, is to put/remove a sort of jumper. However, I was thinking about replacing the 'manual' jumper by a 4066 analog switch, but I am just afraid that the signal will be filtered / altered by this chip. I am working in UHF (300-400MHz) and I cannot find any info related to the frequency.

    What do you think ?

    Thanks

    EDIT;
    I finally found a better datasheet, but it looks like it is not suitable for UHF. Actually, I am deducing it, because the typical frequencies are around 10MHz.
    Does it exist such a switch for high frequencies ?
     
    Last edited: Sep 19, 2010
  2. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    Take a look at the ksw246 from mcl.
    That is a analog switch that works from DC to 4600 Mhz.
    See the datasheet for more info.

    Bertus
     
    cam0 likes this.
  3. skeptic

    Active Member

    Mar 7, 2010
    51
    9
    There is another alternative. You could use PIN diodes. These are used as switches by biasing them off or on. You isolate the DC to the diodes with capacitors and keep the RF out of the DC circuit with chokes. Your reverse bias voltage must be greater than your peak signal voltage and your forward bias current must be greater than your peak signal current.
     
    cam0 likes this.
  4. cam0

    Thread Starter New Member

    Mar 23, 2010
    25
    0
Loading...