+Click the image to get the sch-rnd sheet
+In this simulation we are going to look at how a multi-stage RC filter behaves +when the input voltage is switched from 0 to 5V. + +
+The single-sheet schematic contains the filter, the voltage source and +the spice command symbol. +
+
++ +
+In the tran(sient) analysis a DC solution is calculated first +then a simulation is run with a fixed time stepping, updating the internal +states of components (e.g. capacitor charges) and networks (voltages). The +result is typically a graph with time along the X axis and voltages/currents on +the Y axis. + +
+The process is largely the same as in the +base example of dc op point . The simulation +setup in this example is called "dc transition". Below are +the summary of differences for the current example. + +
+Our input source is not a stable DC voltage source anymore, but a pulse. It's +still a 'V' for voltage source, connected to CN1-2, but the dc and ac +components are left empty and the time dependent value is set to pulse. +This exposes a set of pulse-specific fields. The setup in this example +uses a square wave that starts at 0V, goes up to 5V after 1 usec (TD). It's +not a perfect square, rather a trapezoid, with raise and fall time of 1 usec +each (TR and TF). +
+
++Note: details of the available functions and their fields can be found in +the relevant section of the ngspice manual. + +
+Analysis is set to transient (linear). Linear means the X axis will +be presented as a linear axis (common for time domain simulations). Start +time is not specified so it is assumed to be 0. Simulation stop time is set +to 200 miliseconds, sampling done at 1ms rate (resulting about 200 rows of data). +
+
++Presentation is set to plot and the input and two output nets are listed by +net name. + +
+After running the simulation a plot is presented with three color +coded traces. The plot can be zoomed and panned with the mouse scroll +button. A left click at any point of the plot reads out the closest x +value and corresponding y values for the three traces; these are printed +above the plot. +
+
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