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how to use pcccs?

Zitty

 Hello,

 

I want put some current, that is a polynomial function of another input current into a current mirror.

I just saw the pcccs block in cadence virtuoso. But how do I use that? 

There are fields for the polynomial coefficients, that seams to be clear. But there are two other fields for called "probe" and "port"  what do I have to do with it?

If I dont fill in anything I´ll get an simulation error in spectre.

 

regards Zitty

  • Zitty,

    From "spectre -h pcccs" :

    3       probes=[...]      Devices through which the controlling currents flow.
    4       mprobes=[...]     The mprobes function the same as probes except that
                              they will devide the input currents by the mfactor.
    5       ports=[...]       Indice of the probe ports through which the
                              controlling currents flow.

    So probes is the names of the devices you're measuring the current through, and the ports is the index of the number (e.g. 1, 2 for 1st port of the probe device, 2 for the second port). Most likely if the probe device (i.e the controlling sources) are voltage sources, you'd put 1 for each of the ports.

    Andrew.

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