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sp modelling of differential amplifier

aaamin

 I need to extract s parameters of a differential linear equalizer (high pass filter) using spectre.

I do not have spectre RF.  How do I do four port analysis? 

Parents

  •  Jim,

    Thank you for pointing to right direction. The challenge is that I do not have rfLib.

    So I tried to create balun using two xfmr elements. But cant define rout and rin of balun.

    I am not sure what port impedance to use. Considering the ckt as blakcbox, how do I select

    port imepdance?

     

Reply

  •  Jim,

    Thank you for pointing to right direction. The challenge is that I do not have rfLib.

    So I tried to create balun using two xfmr elements. But cant define rout and rin of balun.

    I am not sure what port impedance to use. Considering the ckt as blakcbox, how do I select

    port imepdance?

     

Children
  • in reply to aaamin

    Transformer impedance is related to the square of turn ratio.  Say you have a transformer with turn ratio of 1:n  That is the primary is 1 times and the secondary is n times of turns.  Now say you connect the secondary to say Zout  Then the impedance seen from primary is Zout/SQR(n)  and if you connect the primary to Zin the output impedance seen by the output connection is: 

    Zin/SQR(1/n)

    or

    Zin X SQR(n) = Zin X n^2

    SQRT(Zin/Zout) =1/n

    or

    Zin/Zout =SQR(1/n)= (1/n)^2

    Regards,

    Babak

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