Consider the schematic below This represents a simple model

Consider the schematic below. This represents a simple model of an interfering aggressor trace on the left which is generating short; 25mA-amplitude pulses of current about 1.1 ns wide every l0ns. The victim trace on the right is coupled inductively via the mutual inductance between L1 and L2. Enter this circuit into PSpice. The current source is called IPULSE. The coupling between inductors L1 and L2 is accomplished via a K LINEAR part. The K LINEAR part requires some setup. Double-click the part to open the Property Editor. Select the columns (or rows depending upon how you have it displayed) labeled COUPLING, L1, and L2, then click the Display... button. Choose to display Name and Value. Apply the change, then go back to the schematic and set the values as displayed above. Set up a Time Domain simulation with a runtime of 25ns and a maximum step size of 10ps. It is convenient to place a Voltage/Level Marker at the indicated node since that is the voltage that you will be plotting. (a) Run the simulation and plot the voltage at the node to the right of L_2. Use a cursor to measure the maximum value of this voltage. It represents the voltage caused by the aggressor trace. Print the plot and mark the maximum voltage on the plot. (b) Now change the rise and fall times of the aggressor from 500ps to 100ps. Repeat the plot and measurement of the prior section. Print the plot and mark the maximum voltage on the plot. (c) Is the interference better or worse for the faster (shorter) rise and fall times? (d) Suppose that the aggressor and victim traces are moved closer to together so that the magnetic coupling is increased. Will the interference be better or worse? (You do not have to run a simulation to answer this, but you may. If you do, try setting the COUPLING value to 0.4 and see what happens.)

Solution

the inteeference better or worse for the fasterrise and fall times

victim trces anyoved together so the the magneic outplig is the reason

repeat the plot and measurement and mark the max voltage of the prior plot.