Cadence PSPICE SCHEMATIC Bedienungsanleitung PDF herunterladen (Seite 9)

Figure 10: Dialogue box for adding a ground connection.

• Choose Place > Ground. . . from the menu bar or click the Place ground connection

button on the toolbar, which brings up the dialogue box shown in ﬁgure 10.

• Choose0/CAPSYM and place it in the usual way.

A circuit must always have a ground (earth) connection called 0 (zero) if you wish to simulate

it in PSpice. You will get puzzling error messages if you forget this, which is very easy! The

reason is that all voltages in PSpice are measured from a particular node, numbered zero, and

this must be deﬁned as ground.

Your circuit should now look something like ﬁgure 7 on page 7 although the components

need not be in exactly the same positions.

Save your work!

3.2 Set the values of the components

Capture gives each component a default value when it is placed but this must usually be

changed. All resistors are initially 1 kΩ, for instance. The unit is not shown – ohms are as-

sumed by default so the display is just 1k. Double-click on a value to change it. This brings

up the dialogue box shown in ﬁgure 11 on the next page for the battery (VDC). If you see

something different, you have probably double-clicked in the wrong place. Close the box and

try again.

Change the values of the resistances and voltage to those shown in ﬁgure 12 on page 11.

I’ll explain how to wire the components next.

3.3 Wire the components

The ﬁnal step is to connect the components using the wiring tool from the toolbar (or Place >

Wire or typing W).

• Place the cursor where you wish to start connecting the circuit and left-click to start a

wire.

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Cadence PSPICE SCHEMATIC Bedienungsanleitung Seite 9