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Complex-constant multiplier in VerilogA

RFStuff

 Dear All,

I am doing a PSS+PNOISE simulation of a circuit in Spectre.

I need to multiply the output voltage of certain terminals with Complex Constant ( exp(j*pi/4)=0.707+0.707i).

This I don't want for post-processing ( which can be easily done using Ocean Script).

I want it on the fly of simulation.

Is there any ways of achieving this in VerilogA.

Kind Regards,

Parents

  • Hi Andrew,

     I am using the ac simulation just to work with ac values so as you say there are no dc components involved. The outputs are two sinusoidal waveforms, one having a phase shift relative to the other, when you multiply these together then there will be a dc component  in additional to the ac component.

    Using the calculator to do the multiplication should allow this fixed component to measured if the multiplication was actually being done on the two ac inputs as complex variables, eg you were multiplying together Asin(wt) and Bsin(wt-theta) where these represent the multiplier inputs in1 and in2. In the calculator I am doing the multiplication on the signal by using VF("/in1")*VF("/in2") and I am wondering whether this takes into account the complex nature of the two signals fully. 

     In one of your previous appends you mentioned a complex function and I wondered whether I should be referencing the output signals of the simulation ( in1 and in2 ) in a different way to get a correct multiplication of these complex variables. If this was happening correctly then I think just taking the real component of the output should provide this dc component.

    Thanks, James

Reply

  • Hi Andrew,

     I am using the ac simulation just to work with ac values so as you say there are no dc components involved. The outputs are two sinusoidal waveforms, one having a phase shift relative to the other, when you multiply these together then there will be a dc component  in additional to the ac component.

    Using the calculator to do the multiplication should allow this fixed component to measured if the multiplication was actually being done on the two ac inputs as complex variables, eg you were multiplying together Asin(wt) and Bsin(wt-theta) where these represent the multiplier inputs in1 and in2. In the calculator I am doing the multiplication on the signal by using VF("/in1")*VF("/in2") and I am wondering whether this takes into account the complex nature of the two signals fully. 

     In one of your previous appends you mentioned a complex function and I wondered whether I should be referencing the output signals of the simulation ( in1 and in2 ) in a different way to get a correct multiplication of these complex variables. If this was happening correctly then I think just taking the real component of the output should provide this dc component.

    Thanks, James

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