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comparing CS and Cascode frequency response

Discussion in 'Electronic Design' started by Matteo, May 2, 2007.

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  1. Matteo

    Matteo Guest

    hi all,
    I calculated the frequency response of the CS and Cascode amplifiers
    using the time constants method. Here they are:

    CS

    f = ( 2*PI*( Rs*Cgs + Rs*Cgs*(1+Av) + Rd*(Cdb+Cl)) )^-1


    Cascode

    f = ( 2*PI*(Rs*Cgs1 + Cds1*2*Rs + Rd*(Cgd2+Cdb2*Cl) + 1/gm2*(Cdb1+Cgs2) )^-1

    where:

    Rs = resistance of the imput signal
    Rd = resistance under Vdd
    Cl = load capacity

    I calculated f using

    Rs = 50ohm
    Rd = 600ohm
    W = 592 micron

    and I obtained

    CS => f = 1.98EE+08
    Cascode => 2.08EE+08

    and I think that's a really little difference! where did I make the mistake?

    thank you very much!
     
  2. Jim Thompson

    Jim Thompson Guest

    Re-read the text book?

    ...Jim Thompson
     
  3. Matteo

    Matteo Guest

    Jim Thompson ha scritto:
    Uhmmm ..What do you mean for? Are you going to tell me that it could NOT
    be a mistake...?
    I posted my work about Cascode configuration in sci.electronics.basics
    group (maybe it's better if you answer there, sorry for the mess..)
     
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