# michele.lora

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1. ## Derivative using ELN constructs

Where do we need to add a resistor? I know this may seen obvious but we do not have much expertise. I completely agree that using LSF will be much easier. However, we need to use ELN for project constraints.
2. ## Derivative using ELN constructs

Hi everybody, we are trying to model a system, using Electrical Linear Network, implementing the following equation: I(out1) = ddt(V(in1)) That is, we want that the current of the output is the derivative of the voltage of the input terminal. to do this we declared: - two terminals (in1 and out1), - two VCCS (v1 and v2), - a sca_node (n) - an inductor (ind). Here you can find the implementation code: #include "../inc/template_1.hh" template_1::template_1( sc_core::sc_module_name name_ ) : sc_core::sc_module( name_ ), in1("in1"), out1("out1"), n("n"), scams_ground("scams_ground"), v1("v1", 1.0), v2("v2", 1.0), ind( "pattern_1", 1.0 , sca_util::SCA_UNDEFINED ) { v1.ncp(in1); v1.np(n); v1.nn(scams_ground); v1.ncn(scams_ground); v2.ncp(n); v2.np(out1); v2.nn(scams_ground); v2.ncn(scams_ground); ind.p( n ); ind.n( scams_ground ); } template_1::~template_1() {} We were expecting that what is modeled here was a derivative. However, when executing and reading the current value on out1, we see unexpected behaviors. In particular, we are writing as input (in1) a double signal, using a sca_de_vsource that starts from 1.0 and every microsecond it is self-multiplied by 1.01. Thus, we were expecting 1.01 constant output. This does not happen and very strange values, ranging from 0 to -1.59561833143e+47 are traced as output (using a tabular file). To read the output value we are using a sca_de_isink. We are probably forgetting or misinterpreting something. Does anyone have any idea? Thank you very much, Michele.
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