iELANA is an acronym for electronic circuit analysis. You use iELANA to produce one of the diagrams below, based on a linear electronic circuit:
These diagrams are often used for the evaluation of transmission quality of analog filters and amplifiers.
As a method for calculating your circuits, the dipole reduction process is used. As a prerequisite for the calculation of a circuit, you define an input in the schematic in which you feed a fixed voltage or current source and choose an output at which one of the following four quantities will be evaluated:
The input source will be calculated during a calculation pass by the program using the frequency range which you specified with a certain frequency distance until the output is reached. The values obtained at the output constitute the resulting values which are presented later in a diagram. The frequency interval depends on the chart's settings. In these settings you can specify whether the frequency axis gets a linear or logarithmic increment. Then determine the total number of points for the charts. This number of points determines the step size for the calculated frequencies which is detected automatically.
Basis of the dipole reduction process is that each component of a circuit must be capable of being represented as a dipole. Thus components made of non-linear characteristics, such as transistors, diodes, and so on are to be eliminated. However, it is possible to use an idealized operational amplifier, whose transmission characteristic is considered to be linear. - The operation of the dipole reduction is based on the fact that a circuit starting with the input upto the output passes through each component and goes through each node of the schematics and tries to combine the crossing components mathematically. Each intermediate result that arises is of a new dipole. Depending on the position to a node this dipole will be constituted as a parallel connected element or in series connection.
The schematic itself is processed in the form of so-called macros in iELANA. For entering and editing these macros you use the macro editor. What is very important here for you: in order to iELANA can understand your circuit you have to rewrite all of the nodes and meshes of the original schematic so that you can move by continued application of series and parallel circuits of dipoles from the input of the circuit forward to the output. For training to see how this technique looks like in the end result it is best to load the sample files supplied and watch them step by step.
Copyright © 2015,2016 by Konran Udo Gerber
Last changed: February 2, 2015 2:45 AM