Want o simulate the four quad current multiplier.

 Hi all;

I want to simulate the four quadrant multiplier(in cadence).wherein the inputs are currents and output is difference of IO1 and I02.The below ckt is for getting the idea how it is ...

[url=http://images.elektroda.net/21_1322998275.png][img]images.elektroda.net/.../url]

The output that i want is as shown in the below fig.

[url=http://images.elektroda.net/57_1322998324.png][img]images.elektroda.net/.../url]

I want to simulate the ckt (from one of the IEEE paper different from the above ckt shown) .
What i want to know is

How to do the DC analysis in CADENCE.wherein [B]Iin1 sweeps from -5nA to 5nA Vs Vout for  Iin2 sweep from -5nA to 5nA with 2.5 nA steps[/B]
What i mean is when i click on aanlyses form i select dc analysis where i select the sweep variable as component parameter i would select Iin1 but how to include Iin2 as also one of the parameter and the graph should be Iin1 vs Vout. how can i do it ? please provide all the steps needed for it as i am newbie in cadence...