Cadence PSPICE SCHEMATIC Manual de usuario descargar pdf (Pagina 24)

Figure 32: Property Editor for the capacitor with an initial condition (IC) set to 0.

linearly and ﬁnd the point at which it cuts the time axis. This should give the time-constant

directly. Check it for the plot.

The output is more interesting from a pulse rather than a single step. Spice offers the

VPULSE source, whose parameters are listed in table 1 on the next page. Change the source in

your circuit to give a 0.2 ms pulse and plot both the input and output. You should ﬁnd that the

output voltage goes negative for a while, although the input is always positive or zero. How is

Date/Time run: 09/17/08 14:41:43

** Profile: "SCHEMATIC1-timesingle" [ C:\Documents and Settings\John Davies\My Documents\OrCAD intro\RC transie...

Temperature: 27.0

Date: September 17, 2008 Page 1 Time: 14:42:44

(A) timesingle (active)

Time

0s 0.1ms 0.2ms 0.3ms 0.4ms 0.5ms 0.6ms 0.7ms 0.8ms 0.9ms 1.0ms

V(OUTPUT)

0.2V

0.4V

0.6V

0.8V

1.0V

Figure 33: Output voltage from the RC high-pass ﬁlter with time-constant τ = 0.1ms.

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Cadence PSPICE SCHEMATIC Manual de usuario Pagina 24