Cooper LP800 Guia do Utilizador descarregar pdf (Página 304)

100

101

DC Sweep 9

-7

Curve Families for DC Sweeps

Whenever a nested DC sweep is performed, the entire curve

family is displayed. That is, the nested DC sweep is treated as a

single Probe data section (or you can think of it as a single

PSpice A/D run).

For the circuit shown in Figure 9-3, you could set up a DC

sweep analysis with an outer sweep of the voltage source VD

and an inner sweep of the voltage source VG as listed in

Table 9-2

When the DC sweep analysis is run, add a current marker at the

drain pin of M1 and display the simulation result in Probe. The

result will look like Figure 9-4.

To add a load line for a resistor, add a trace that computes the

load line from the sweep voltage. Assume that the X axis

variable is the sweep voltage V_VD, which runs from 0 to 5

volts. The expression which will add a trace that is the load line

for a 50 kohm resistor is:

(5V-V_VD)/50K

This can be useful for determining the bias point for each

member of a curve family as shown in Figure 9-5.

Table 9-2

Curve Family Example Setup

Outer Sweep Nested Sweep

Swept Var Type Voltage Source Voltage Source

Sweep Type Linear Linear

Name VD VG

Start Value 0 0

End Value 5 2

Increment 0.1 0.5

ure 9-3

Curve Family

Example Schematic

Use Mark Current Into Pin in

MicroSim Schematics on the

Markers menu to add a current

marker.

V_VD is the hierarchical name

for VD created by netlistin

the

schematic. This is the name

used by Probe.

1 2 ... 299 300 301 302 303 304 305 306 307 308 309 ... 566 567

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