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Equivalent Noise Charge (ENC) Calculation of a Charge Sensitive Amplifier in Cadence Virtuoso

Hamzarfcs2

I am trying to design a Charge Sensitive Amplifier(CSA) for X-Ray detection in Cadence Virtuoso. I have some confusion that how can I calculate the Equivalent Noise Charge (ENC) of my design CSA in Cadence. Can anyone here guide me about the measurement of ENC??

  • I am trying to design a Charge Sensitive Amplifier(CSA) for X-Ray detection in Cadence Virtuoso. I have some confusion that how can I calculate the Equivalent Noise Charge (ENC) of my design CSA in Cadence. Can anyone here guide me about the measurement of ENC??

  • in reply to Hamzarfcs2

    Please read Guidelines for the Custom IC Design Forum - (especially the part which asks you not to post the same question in multiple forums, and also providing enough information such as versions used).

  • ENC =
    ((sqrt(iinteg(  getData( "out" ?result "noise-noise" ) **2    )) * (-1) *  VAR("Qin")) / 1.6e-19 /
    (
    (VAR("Qin") - abs(VAR("Qin")))/(2*VAR("Qin")) * ( ymax(VT("/OUT_1")) - VDC("/OUT_1") ) -
    (VAR("Qin") + abs(VAR("Qin")))/(2*VAR("Qin")) * ( VDC("/OUT_1") - ymin(VT("/OUT_1")) ) ))

    Where Qin is your injection charge.

    Let say in you analog environment you have a Design variable Qin, a time pulse tp and a current in your ipulse Iin (pulse width : tp):

    Qin=3f

    tp=500n

    Iin=Qin/tp

    Regards,

    ++

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