A CAD tool suitable for LTI systems analysis

Abstract

A CAD approach permitting us an easily frequency response simulation of LTI systems implemented with analog electronic-devices, is introduced. This technique uses the features of symbolic analysis in order to get more insight into the behavior of the circuit. An important thing is that a reasonable amount of computer effort is saved through modeling several analog circuits using nullors. Most important is that using nullors, a pure nodal-analysis method is established in order t o improve the computation of transfer functions. In the paper, it is also demonstrated the suitability and appropriateness of the proposed simulation technique to be used in education.

Computing symbolic transfer functions of analog circuits by applying pure nodal analysis

“…An opamp-based PID controller taken from [9] is shown in Fig. 1 1. The nullor circuit-equivalent of this circuit is shown in Fig.…”