AMS Simulator in cadence virtuoso

"IC 6.1 version" is a bit vague. IC6.1.0 was released in 2006, and so we've got 10 years of different versions, including 8 major releases in that time.

Anyway this is nothing to do with "config file" - it's a simulator setting in ADE, not the config view. DC sweep in AMS has only been added recently - in IC617 ISR5 (6.1.7.500.5). It might be that you could do this during a transient analysis too - if you are able to plot the resistance versus time, and voltage version time, you can then use the right mouse button menu over the x-axis in the ViVA graph to change the x-axis to be (say) the voltage signal. Not sure if that does what you want, or whether you really need the dc sweep.

BTW, this forum should not be used for urgent questions as it is manned purely by volunteers - I'm answering here sat in an airport lounge waiting to board - there's no guaranteed response. If you want that, you should contact customer support.

Kind Regards,

Andrew.

Thank you Andrew for the reply,
I have one more doubt, in an verilog AMS code, in the input and output port list, i have declared module(T1,T2,X).... and i have written a expression in the code let us say temperature versus Voltage,where in the port list this temperature is not there. how to plot a graph for this using AMS simulator.
Thank you

Please show what you've written - otherwise I would have to guess how to access the signal (if indeed it's a signal).

Regards,

Andrew.

This is the verilog AMS code, i have declared all the parameters but i am not showing them here now.

module Model1(T1,T2,x,Ttrans,PI);

inout T1, T2,x,Ttrans,PI;
electrical T1, T2,x,Ttrans,PI;
real PolaP;
real PolaAP;

real surface;
real gp;
real gap;

real Em;

real TMRR;
real TMRRT;

real Rap;
real Rp;

real Vb; //V(T1,T2)
real Vc; //V(T2,T1)

real Id; //Current of MTJ

//critial current for the two states of STT-MTJ
real IcAP; //Critial current for AP state
real IcP; //Critial current for P state

integer Teta;

real ix;

real tau;
real p;

real FA;


real duration;
analog begin

if (SHAPE==1)
begin
surface=a*b; //SQUARE
end
else if (SHAPE==2)
begin
surface=`M_PI*a*b/4.0; //ELLIPSE
end
else
begin
surface=`M_PI*r*r; //ROUND
end

Vc=V(T2,T1);
Vb=V(T1,T2);

//initial conditions
@(initial_step)
begin

FA=3322.53/RA;
Ro=(tox*1.0e10/(FA*`sqrt(PhiBas)*surface*1.0e12))*exp(1.025*tox*1.0e10*`sqrt(PhiBas));


Em=Ms*tsl*surface*Hk/2;

ix=PAP;
I(x)<+ ix;
I(Ttrans)<+ix;

I(PI)<+0;

end
if(V(Ttrans)==0)
begin

Teta=0;

PolaP=`sqrt(TMR*(TMR+2))/(2*(TMR+1));

gp=alpha*gamma*`e*Ms*tsl*Hk/(40*`M_PI*(`ub*PolaP));
IcP=gp*surface;

//TMR real
TMRR=TMR/(1+Vb*Vb/(Vh*Vh));


Rp=Ro;

if(Vb>=IcP*Rp)
begin


duration=(`C+ln(`M_PI*`M_PI*(Em/(`Kb*T*40*`M_PI))/4))*`e*1000*Ms*surface*tsl*(1+P*P)/(4*`M_PI*2*`ub*P*10000*abs(Id-IcP)

if((duration<Pwidth))
begin //Switching of the free layer always occurs
ix=-1.0; //change the current state of MTJ
Id=Vb/Rp;
end
else
begin
ix=0.0;
Id=Vb/Rp;
end

end

else
begin
ix=0.0;

Id=Vb/Rp;
end

end


if(V(Ttrans)!=0)

begin

Teta=`M_PI;

PolaAP=`sqrt(TMR*(TMR+2))/(2*(TMR+1));

gap=alpha*gamma*`e*Ms*tsl*Hk/(40*`M_PI*(`ub*PolaAP));
IcAP=gap*surface;


TMRRT=TMR/(1+Vb*Vb/(Vh*Vh));


Rap=Ro*(1+TMRRT);


Rp=Ro;
if(Vc>=(IcAP*Rap))

begin
duration=(`C+ln(`M_PI*`M_PI*(Em/(`Kb*T*40*`M_PI))/4))*`e*1000*Ms*surface*tsl*(1+P*P)/(4*`M_PI*2*`ub*P*10000*abs(-Id-IcAP));


if((duration<Pwidth))
begin
ix=0.0;

Id=Vb/(Rap);
//Id=(Vb*(1+TMRRT))/(Rap);
end
else
begin
ix=-1.0;
Id=Vb/(Rap);
end

end

else
begin

ix=-1.0;
Id=Vb/(Rap);
end

end

I(x)<+ix; //Actualisation of the state of x with the value calculated

V(T1,T2)<+I(T1,T2)*Rp;

I(T1,T2)<+Id; //Actualisation of the current of MTJ with the value calculated

I(PI)<+-p; //Probability density function

end

endmodule

I am using product version 15.1, virtuoso version IC 6.1.6. 64-b. 500.4
For this code i have created symbol->schematic testbench->config view for the testbench.
In the above code, if i want to plot the graph between TMRR and Vb from the expression, TMRR=TMR/(1+Vb*Vb/(Vh*Vh)), then what is the procedure..

Thanking you.

hello Andrew,
As i said earlier iam using virtuoso product version IC 6.1.6. 64-b. 500.4
while using ADEXL, when i right click 'test or analysis name' in the data view assistant pane, it is not displaying stimuli and also context sensitive menu.
what to do to get these forms....

Regards

sorry andrew for the wrong word 'context sensitive menu' above,
when i right click 'test or analysis name' in the data view assistant pane,context sensitive menu apperaed, but there is no customize menus at the end of the context sensitive menu and stimuli

Regards

To answer (rather belatedly) your original question about saving the internal variables, bring up the test editor (double click on the test name in ADE XL) and then Outputs->Save All and set the "Save AHDL variables" to "all". You can do it more selectively, but you either need to add a probe tcl command or do this from within the SimVision debugger - so it keep it simple, you can get all of the internal variables this way.

After simulation, you can use the results browser to access the internal signals.

I've no idea what your last two questions are trying to ask. If you were (via some roundabout way) asking about using Setup->Stimuli when using AMS as the simulator - the simple answer is that it doesn't exist. This is only there for spectre.

Regards,

Andrew.

Ok Thank you Andrew for the reply.
I am using product version 15.1, virtuoso version IC 6.1.6. 64-b. 500.4.
I came to know that DC sweep is not possible using AMS simulator in version 6.1.6, if this is the case then how sweeping has to be done for any variable with AMS simulator. Is there any procedure for sweeping a variable in version 6.1.6,as we have only 6.1.6 in our institute

Regards

Tools->Parametric Analysis in ADE is probably your only choice (or similar variable sweeps isn ADE XL) in that case.

Regards,

Andrew.

Thank you Andrew
I have done sweeping a variable using Tools-> parametric analysis for DC type analyses where the parametric simulation success message is obtained but the PLOT is not generated for the same.
I got the plot for transient analysis
How to get the plot for DC analysis.

Regards