noiinteg.c File Reference

#include "spice.h"
#include <stdio.h>
#include <math.h>
#include "cktdefs.h"
#include "noisedef.h"
#include "util.h"

Include dependency graph for noiinteg.c:

Go to the source code of this file.

Functions
double	Nintegrate (double noizDens, double lnNdens, double lnNlstDens, GENERIC *dataptr)

Function Documentation

double Nintegrate	(	double	noizDens,
		double	lnNdens,
		double	lnNlstDens,
		GENERIC *	dataptr
	)

Definition at line 32 of file noiinteg.c.

{
    Ndata *data = (Ndata*)dataptr;
    double exponent;
    double a;

    exponent = (lnNdens - lnNlstDens) / data->delLnFreq;

    if ( FABS(exponent) < N_INTFTHRESH ) {
        return (noizDens * data->delFreq);
    }
    else {
        a = exp(lnNdens - exponent*data->lnFreq);
        exponent += 1.0;

        if (FABS(exponent) < N_INTUSELOG) {
            return (a * (data->lnFreq - data->lnLastFreq));
        }
        else {
            return (a * ((exp(exponent * data->lnFreq) -
                exp(exponent * data->lnLastFreq)) / exponent));
        }
    }
}