Capsim Block Documentation
This star is a self-contained second order delta sigma modulator.
| Port | Type | Name | |
|---|---|---|---|
| 0 | float | in |
| Num | Description | Type | Name | Default Value | |
|---|---|---|---|---|---|
| 0 | The gain of the first integrator | float | g1 | 1.0 | |
| 1 | The gain of the second integrator | float | g2 | 1.0 | |
| 2 | Binary Quantizer Level | float | delta | 1.0 |
| Num | Type | Name | Initial Value | Description |
|---|---|---|---|---|
| 0 | float | y | 1.0 | |
| 1 | float | x | 0.0 | |
| 2 | float | p | 0.0 | |
| 3 | float | xold | 0.0 | |
| 4 | float | yold | 0.0 | |
| 5 | int | numberOutputBuffers |
int i; |
|---|
/* note and store the number of output buffers */
if((numberOutputBuffers = NO_OUTPUT_BUFFERS() ) <= 0) {
fprintf(stderr,"ds2: no output buffers\n");
return(1); /* no output buffers */
}
if(numberOutputBuffers > 2) {
fprintf(stderr,"ds2: more than two outputs\n");
return(2);
}
|
|---|
while(IT_IN(0))
{
x = xold + g1*in(0) - g1*p;
y = yold + g2*xold - g2*p;
p = delta;
if(y < 0.0) p = -delta;
if(numberOutputBuffers==1) {
if(IT_OUT(0)) {
KrnOverflow("ds2",0);
return(99);
}
OUTF(0,0)=p;
} else {
if(IT_OUT(0)) {
KrnOverflow("ds2",0);
return(99);
}
OUTF(0,0)=p;
if(IT_OUT(1)) {
KrnOverflow("ds2",1);
return(99);
}
OUTF(0,0)=y;
}
xold = x;
yold = y;
}
|
|---|
/* Capsim (r) Text Mode Kernel (TMK) Star Library (Blocks)
Copyright (C) 1989-2002 XCAD Corporation
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
http://capsimtmk.sourceforge.net
XCAD Corporation
Raleigh, North Carolina */
|
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/*************************************************************************** ds2.s **************************************************************************** This star is a self-contained second order delta sigma modulator. Ouput 0 is the output of the circuit. Output 1 is the input to the comparator if connected. -Parameter one: the gain of the first integrator -Parameter two: the gain of the second integrator -Parameter three: the value for delta |
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