Blocking network

Discussion in 'The Projects Forum' started by 3BwEH, Jul 7, 2008.

  1. 3BwEH

    Thread Starter Active Member

    Feb 25, 2007
    33
    0
    Can anybody help me to design a blocking network for a DC bias network in an amplifier

    i want a capacitor in parallel and an inductor in series
    and i want the output of the blocking to be around -30dB
    need help to determine the values of the inductors and capacitors
    multi-stage network is preferred

    thanks
     
  2. 3BwEH

    Thread Starter Active Member

    Feb 25, 2007
    33
    0
    the ampliofier is working at 2-4 GHz
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The inductor will do the blocking - adding a cap in parallel to it will just make a path around the inductor and effectively remove it from the circuit. You might want to use the cap to shunt AC to ground on the power side of the inductor.

    In the GHz range, picofarad caps and one turn inductors should do the trick.
     
  4. 3BwEH

    Thread Starter Active Member

    Feb 25, 2007
    33
    0
    I tried to put a capacitor to ground and a series inductor
    but the problem is at the output of the amplifier everything is fine i get a -30dB over the frequency range but at the input its -30dB at certain freq.

    I also tried to have a quarter wavelength TL instead of the inductor ... did not work at well

    if u plz could help me with a blocking network with numbers
    frequency range 2-4 GHz
     
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