PSpice User Guide

PSpice User Guide

Issue link: https://resources.pcb.cadence.com/i/1180526

Contents of this Issue

Navigation

Page 831 of 884

PSpice User Guide Setting initial state October 2019 832 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Setpoints Pseudo-components that specify initial conditions are called setpoints. These apply to the analog portion of your circuit. Figure A-1 Setpoints. The example in 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 your circuit design 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 property to the desired initial condition. PSpice 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 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

Articles in this issue

view archives of PSpice User Guide - PSpice User Guide