Looking for ideal opamp model file for Cadence

[suhas_shiv]

Hi all,

Does cadence analog library have an ideal opamp that I can use to simulate a circuit? Do I have to attach a model file for it also just like for a MOS transistor? If yes, where can I find a simple model file for it?

Thanks

Suhas

 

[safwatonline]

Re: Cadence Help

functional library >>opamp.
else try to make ur own by verilog , i made a simple one by verilog a while ago ,it may help.

module CMFB(inp,inn,out,VDD,GND);
        input inp,inn,VDD,GND;
        output out;
        electrical inp,inn,VDD,GND,out;
        parameter real GAIN=30;
        real x,y;
analog begin
//      @(cross((V(inp)-V(inn)),0))
                x = 0.9 + GAIN*(V(inp) - V(inn));
        if (x > V(VDD)) begin
                y = V(VDD);
        end
        else if( x <V(GND)) begin
                y = V(GND);
        end
        else if ( (x < V(VDD)) && (x>V(GND))) begin
                y = x;
        end

 

[suhas_shiv]

Cadence Help

Hi thanks,

I tried using the one u mentioned(opamp - symbol and opamp-spectre) but I get an error undefined model. So I assume it is looking for a model file associated with this.

 

[safwatonline]

Cadence Help

yep i tried it now and it gives me a model eror too, sorry try using the model i posted i tried it b4.

 

[gevy]

Re: Cadence Help

I use vcvs as ideal opamp.