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AMS Simulator in cadence virtuoso

Pandurangaiah

I am using cadence IC 6.1 version.

 I am using verilog ams and created test bench in schematic,to simulate a cell i have created a config view for test bench.I came to know that we need to create a config file if verilog ams code and ams simulator is used.I could do transient analysis for config view using ams simulator, but may i know how to plot resistance on y-axis versus voltage on x-axis curve using ams simulator in cadence (i.e. how to do DC simulation plot for config view) .I have saved DC operating point,and seen results in results->print->Dc operating point.

The problem is as config file has no option of sweeping a variable while dc analysis, how to choose a sweep variable, let us say voltage  or current on x-axis.

Please give the response as soon as possible as i am struggling for this since 2 weeks.

 

Thank you.

Parents
  • 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.
Reply
  • 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.
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