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Calculate input impedance for matching with spectreRF

engrvip

Hi

I am designing an LNA and want to match its input impedance to 50Ohms port impedance.


During 'sp' analysis in spectreRF , which function will give me idea about this impedance matching.

Gp,Ga , Gmax ,Gumx etc.  only gives the gain value depending upon kind of matching at input and output of LNA.

Is it OK to use Z11 and Z22 as input and output impedance values for matching purpose.

Or is their some other way thru which impedance matching is determined in SP or some other analysis with spectreRF.

Regards

Vipul

Parents
  • Hi Vipul,

    Please let me know the Case number so I can track your Case internally and make sure that it gets to the correct folks who are RF experts.

    When you say Zsor, please clarify. Source impedance? And Zin - is that the impedance looking into the DUT?
    Within the industry, there are various ways of specifying these equations. And even within our tool, there are areas of ambiguity.
    It is critical to define all terms, in my experience. :-)

    Best regards,
    Tawna
Reply
  • Hi Vipul,

    Please let me know the Case number so I can track your Case internally and make sure that it gets to the correct folks who are RF experts.

    When you say Zsor, please clarify. Source impedance? And Zin - is that the impedance looking into the DUT?
    Within the industry, there are various ways of specifying these equations. And even within our tool, there are areas of ambiguity.
    It is critical to define all terms, in my experience. :-)

    Best regards,
    Tawna
Children
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