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git-svn-id: http://moon:8086/svn/matlab/trunk@99 801c6759-fa7c-4059-a304-17956f83a07c
2018-08-30 18:06:49 +00:00
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+## Copyright (C) 2018 Jens Ahrensfeld
+## 
+## This program is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or
+## (at your option) any later version.
+## 
+## This program 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 General Public License for more details.
+## 
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*- 
+## @deftypefn {Function File} {@var{retval} =} sallenkey_eval (@var{input1}, @var{input2})
+##
+## @seealso{}
+## @end deftypefn
+
+## Author: Jens Ahrensfeld <ahrensfeld@w2ess001vm>
+## Created: 2018-05-28
+
+function sallenkey_eval (f_cut_Hz, Q)
+
+w_cut = 2*pi*f_cut_Hz;
+
+m = 1.0;
+n = Q*(m*m + 1)/m;
+
+R = 1.0e+3;
+C = 1/(R*w_cut)
+
+R1 = m*R
+R2 = R/m
+
+C1 = n*C
+C2 = C/n
+
+
+w0 = 0.1;
+w1 = 2*pi*1e+6;
+w_step = 10;
+
+s = j*(w0:w_step:w1);
+
+H_s = 1./(1 + C2*(R1 + R2)*s + C1*C2*R1*R2*s.^2);
+
+semilogx(abs(s)/(2*pi), abs(H_s)); grid; xlabel('f/Hz'); ylabel('|H(j*2*pi*f)|')
+
+
+
+
+endfunction