User`s guide

DC Sweep 9

-3

Overview of DC Sweep

The DC sweep analysis causes a DC sweep to be performed on

the circuit. DC sweep allows you to sweep a source (voltage or

current), a global parameter, a model parameter, or the

temperature through a range of values. The bias point of the

circuit is calculated for each value of the sweep. This is useful

for finding the transfer function of an amplifier, the high and low

thresholds of a logic gate, and so on.

For the DC sweep analysis specified in Figure 9-1, the voltage

source V1 is swept from -0.125 volts to 0.125 volts by steps of

0.005. This means that the output has (0.125 + 0.125)/0.005 +1

= 51 lines.

A source with a DC specification (such as VDC or IDC) must be

used if the swept variable is to be a voltage type or current

source. To set the DC attribute, select Attributes from the Edit

menu.

The default DC value of V1 is overridden during the DC sweep

analysis and is made to be the swept value. All of the other

sources retain their values.

After running the analysis, the simulation output file

(

example.out for the example.sch circuit in Figure 9-2)

contains a table of voltages relating V1, node OUT1, and node

OUT2.

ure 9-2

Example Schematic example.sch

Click or double-click the

symbol.

The example circuit

example.sch is provided with

the MicroSim pro

ram

installation.