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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,

    There is a chapter in the SpectreRF User Guide that you should take a look at:  analogLib Components Used in RF Simulation.  You'll want to look at the port component, specifically terminating the port.

    Next, there is a section Reference:  S-Parameter Equations.  These describe the equations behind the Direct Plot form.   Here, Zm is described.  It plots the input impedance if all other ports are matched.

    You also may want to look at the portAdapter in rfExamples.  It is typically used with loadpull analysis.   Perhaps it could be used to match a circuit to the port.  Unfortunately, it's not at all documented.

    Best regards,

    Tawna

Reply

  • Hi Vipul,

    There is a chapter in the SpectreRF User Guide that you should take a look at:  analogLib Components Used in RF Simulation.  You'll want to look at the port component, specifically terminating the port.

    Next, there is a section Reference:  S-Parameter Equations.  These describe the equations behind the Direct Plot form.   Here, Zm is described.  It plots the input impedance if all other ports are matched.

    You also may want to look at the portAdapter in rfExamples.  It is typically used with loadpull analysis.   Perhaps it could be used to match a circuit to the port.  Unfortunately, it's not at all documented.

    Best regards,

    Tawna

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