ENGR $117,$ Computer Assignment #$5$

Calculate the analytical solution from:

Problem $8\mathrm{.}6$: $R=2k$ ohms, $C=10nF$ and $L=250mH.Io=-30mA$ of inductor, $Vo=90V$ of cap.

Write a MatLab m$-$file to plot your analytical solution $($from part $1.$ above$).$

Use PSPICE to help solve problem.

Verify that the MatLab & PSPICE plots agree $($Note that you need to adjust the time increment in PSPICE to fit the plot on one or two pages in the output file; however, you can make the time increment much finer in MatLab, since the plot will be the same overall size, but smoother$).$

Use comments $($for both MatLab m$-$files and PSPICE output files$)$ to include:

your name

ENGR $117$

Computer Assignment #$5$

the date

other comments $($to help you later on to remember what you have done$)$

Turn in a copy of the MatLab m$-$file.

Turn in a copy of your MatLab plot by printing the MatLab figure window results. Use the following commands to properly label your graph $($note that you can use the text insertion button to add your name, etc., to the figure$)$:

title

x$\_$label

y$\_$label

Turn in the PSPICE output file.

NOTE: You must verify that the PSPICE plot agrees with the MatLab plot in order to receive full credit. Show the verification by identifying corresponding points on the $2$ graphs. Note that the PSPICE plot has the y$-$axis $($voltage$)$ going horizontal at the top, and the $x-$axis $($time$)$ going vertical downward on the page $($i$.$e$.,$ rotate the page $90$ degrees counter$-$clockwise to get it in the standard form$).$

Hints for PSPICE:

A sample program is given $($Note: you may need to change these values, including your time increment and final time, the nodes, and you need to add an inductor$)$:

rc$\_$time.cir

C$1102\mathrm{.}0e-6IC=10\mathrm{.}0$

R$1102\mathrm{.}0$ohm

$.$tran $1$e$-620$e$-6$ UIC

UIC stands for Use Initial Condition

$.$plot tran $v(1)$

the plot command also shows the "print" values $--$ use one or the other command. $.$end

Hints for MatLab:

Build up your function slowly, testing small changes in the command window. Note: you may need to use the $"."$ for some matrix operations.

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