User`s guide

4 Settin

Initial State

Setpoints

Pseudocomponents that specify initial conditions are called

setpoints. These apply to the analog portion of your circuit.

ure A-1

Setpoints

The example is Figure A-1 includes the following:

Using IC symbols sets the initial conditions for the bias point

only. It does not affect the DC sweep. If the circuit contains both

an IC symbol and a NODESET symbol for the same net, the

NODESET symbol is ignored.

To specify the initial condition, edit the value of the VALUE

attribute to the desired initial condition. PSpice A/D attaches a

voltage source with a 0.0002 ohm series resistance to each net to

which an IC symbol is connected. The voltages are clamped this

way for the entire bias point calculation.

NODESET1 is a one-pin symbol which helps calculate the bias

point by providing a initial guess for some net. NODESET2 is a

two-pin symbol which helps calculate the bias point between

two nets. Some or all of the circuit’s nets may be given an initial

guess. NODESET symbols are effective for the bias point (both

small-signal and transient bias points) and for the first step of the

DC sweep. It has no effect during the rest of the DC sweep or

during the transient analysis itself.

IC1 a one-pin symbol that allows you to set the

initial condition on a net for both small-

signal and transient bias points

IC2 a two-pin symbol that allows you to set

initial condition between two nets