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custom VCCS

Sali

Dear all

I want to design a vccs to implement this function:

I(y)<+ tanh(V(x));

I have done that using a verilogA model and I connect it in the cadence circuit which is as in the attached file, the model itself works fine but I want it to act as a real electronic component when connected to the circuit, by means when I change the output resistance the output current from this component should be changed accordingly as in the real electrical circuits, how can I do that, the current is always fixed and not affected by the resistor next to it. Because at the end I'll do a lab work by which I will use a similar component .

I read about bsource but I did not find it in any of the libraries !

any suggestion will be appreciated.

Thank you

Parents
  • Andrew Beckett

    Whether you use VerilogA or bsource is not the point here - it's a matter of how you formulate the equation.

    Maybe you want something like:

    I(x,y) <+ tanh(V(x,y));

    The idea is that you want there to be a relationship where the current through the branch is a function of the voltage across it. I don't really know what you're trying to achieve though!

    Currently you are measuring the voltage at the input 9to ground), and generating an ideal current at the output (to ground); there is no current flow through the device itself.

    By the way, the bsource component is available in analogLib from IC617 ISR6 onwards.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Whether you use VerilogA or bsource is not the point here - it's a matter of how you formulate the equation.

    Maybe you want something like:

    I(x,y) <+ tanh(V(x,y));

    The idea is that you want there to be a relationship where the current through the branch is a function of the voltage across it. I don't really know what you're trying to achieve though!

    Currently you are measuring the voltage at the input 9to ground), and generating an ideal current at the output (to ground); there is no current flow through the device itself.

    By the way, the bsource component is available in analogLib from IC617 ISR6 onwards.

    Regards,

    Andrew.

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