Cadence PSPICE SCHEMATIC Uživatelský manuál stáhnout pdf (Strana 15)

Figure 19: Property editor for a parameter block. A new parameter Rload has been added with

a default value of 400.

PARAM block, use it in the circuit, and vary it in the simulation.

1. First, create a parameter for the resistance of the load, which I’ve called Rload.

• Place a PARAM component on your schematic from the special library. This isn’t a

real component – just a place to hold the parameters that we create.

• Double-click the PARAM block or right-click it and choose the Edit Properties. . .

contextual menu item. This brings up the Property Editor or spreadsheet for the

component, shown in ﬁgure 19. Sometimes it comes up as a row rather than a

column, If this happens, right-click in the empty cell at the top left (to the left of A)

and choose Pivot.

• Choose New row. . . , enter the name of the parameter (Rload) and default value (use

its previous, ﬁxed value of 400). Click OK to get rid of the dialogue box. The row

will now appear in the spreadsheet.

• The parameter does not appear on the schematic by default (sigh. . . ) so you must

select the newly added row/column in the spreadsheet, click the Display. . . button,

select Name and Value and ﬁnally click OK.

• Close the spreadsheet by clicking the Close box, which saves the new values.

2. The next step is to use this parameter for the load resistance.

• Double-click on the value of R2, which brings up a box like that in ﬁgure 11 on

page 10.

• Change the value from 400 to {Rload}. This is the name of the parameter in curly

brackets. Click OK. The schematic drawing should now resemble ﬁgure 20 on the

following page.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 24 25

Žádné komentáře

Cadence PSPICE SCHEMATIC Uživatelský manuál Strana 15