# Open the circuit called diffamp in the examples

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Open the circuit called DiffAmp in the examples directory and run a transient analysis. Press Add more curves again and place a check in the Advanced edit field. Position the cursor in the Advanced edit field below the comment {Your expressions here} . Type : IR2 := I_R2[14,16](t); VCE := VP_15(t)-VP_3(t); Change the line F := 1; {The result value} to: F := IR2*VCE; Enter the name of our new function, OutDissipation, and press Create.

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Finally, press OK to draw our new function in the diagram window.
Drawing trajectories (xy-plots) in TINA In the Post-processor you can also display a signal as a function of another signal, by drawing XY-plots. C1, 10n C2, 10n L, 1u R, 1k - + 10V Out2 Out1 2N1893 IL For example, let's draw the voltage of capacitor voltage Out2 as a function of the inductor current IL in the oscillator shown in the figure above. First load the circuit limitc.tsc from the EXAMPLES directory. Run the Analysis.Transient analysis. Now the diagram window shows two curves, the capacitor voltage, out1, and the inductor current, IL.

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Press the Add more curves button and check the XY-plot checkbox. As you can see in the next figure, the line-edit section is divided into an X-part and a Y-part. Type Out2(t) in the X part and IL(t) in the Y part and press Create and OK. Alternatively, you could have brought the names into the two fields using the “Add to Edit-area” button.
The calculated curve is shown in the next figure. Place a cursor on any curve and move the cursor. As the curve starts from the (0,0) point and converges to a closed trajectory, we see a “limit cycle.” Limit cycles are very important in the theory of oscillators.

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Optimization TINA’s optimization tool will determine for you one or more unknown circuit parameters (Control Object) which satisfy a predefined circuit target response (Optimization Target). The target circuit response (voltage, current, impedance, or power) must be “monitored” by a meter–or meters– previously inserted at the desired location(s). The unknown circuit parameter(s) will be determined automatically so that the circuit will produce the target output. Two alternative iterative methods (simple and pattern search) are used to find the optimum. Use the commands Analysis.Control Object, Analysis.Optimization Target, or the speed buttons Select Control Object , Select Optimization Target to set up Optimization mode or to change their settings. First, place the voltage, current, impedance or power meter(s) onto the schematic to represent the Optimization Targets. Click on the Select Optimization Target speed button or select the Analysis.Optimization Target menu item. A special cursor will appear in the schematic editor window, waiting for you to identify the meter. Should you need more meters to represent the optimization targets, repeat the procedure above for the other meters.
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