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pi vs tee

Discussion in 'Electronic Design' started by Phil Newman, Dec 18, 2003.

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  1. Phil Newman

    Phil Newman Guest

    Can anyone tell me the advantages of an RF pi-network over a tee-network for
    a low noise amplifier design?

    i decided to choose a pi network to design mine, and want to justify my
    decision, rather than saying "it looked nicer"

    any help would be appreciated

    phil
     
  2. Don Pearce

    Don Pearce Guest

    Assuming you are talking about LC matching structures, the big
    difference is the out-of-band impedance. For the PI network it will be
    low at high frequencies, while for the TEE network it will be high. In
    band they can both be made to perform identically.

    d

    _____________________________

    http://www.pearce.uk.com
     
  3. Phil Newman

    Phil Newman Guest

    ah yes, knew i forgot something! the pi-nw i have has a parallel inducor,
    then series inductor, then parallel capacitor

    cheers for the answer

    phil
     
  4. Roy McCammon

    Roy McCammon Guest

    I usually go for the fewest inductors.
     
  5. Don Pearce

    Don Pearce Guest

    Depends on the frequency. If it is high enough you can implement them
    in PCB track and save the cost of a component.

    d

    _____________________________

    http://www.pearce.uk.com
     
  6. Mathematically you can convert any T into a pi, or vice versa. You
    usually pick the one that gives the lower cost, or more reasonable
    component values.
     
  7. Phil Newman

    Phil Newman Guest

    ok, thats great. thanks for the help guys

    another question id like to ask (and I've asked it in a new link too)

    is how to achieve broadband stability using these networks?

    in my amplifier I have k > 1 between 10 and 14 GHz, which is the freq of
    operation, but how can I increase this range?

    I've added more resistance for stabilisation, but this will reduce gain.

    I thought of resistively loading the bias network, which I don't have at
    though mo, because I wasn't sure how to do that for a LNA.

    any ideas?

    phil
     
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