Cadence PSPICE SCHEMATIC Instrukcja Użytkownika Pobierz pdf (Strona 15)

(names and parameters), which can be edited in the dialog.

Setting up the analysis

Now that the circuit schematic is completed, you are ready to tell PSPICE how to analyze the

circuit. From the "PSPICE" menu, select the menu item "New Simulation Proﬁle" (or choose the

ﬁrst item in the second horizontal toolbar). A small dialog appears that asks you to give a name

to the simulation proﬁle you are creating. Choose a clever name like "DC" and click on "Create".

Another dialog with many tabs appears. The only tab that is important at this point is the one

labeled "Analysis". It is important to understand the different analysis types, which are selected

using the pop-up menu under the heading “Analysis Type”.

There are four options in that menu.

1. Bias point. This calculates the DC values for all the node voltages and branch currents in the

circuit. This corresponds to using the DC multi-meter to probe each voltage and current in the

circuit. When using this option, the voltages and/or currents will be displayed directly on the

circuit diagram.

2. DC Sweep. Similar to bias point, expect that the value of one DC source in the circuit can be

varied over some range, and the currents and voltages in the circuit are calculated at each DC

source value. This allows you to make a plot of a voltage or current in the circuit as a function of

the DC source voltage.

3. AC Sweep/Noise. This uses a constant amplitude AC source whose frequency can be varied

over some range. The AC (complex) voltages and currents are calculated at each frequency.

This allows you to make a plot of the magnitude and/or phase of any voltage or current in the

circuit as a function of frequency (i.e. a frequency response plot). (The Noise part of this option

is a bit more advanced. It allows you to deﬁne a noise source in the circuit so that you can

examine how a circuit behaves in the presence of electrical noise.)

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Cadence PSPICE SCHEMATIC Instrukcja Użytkownika Strona 15