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AN3984 датащи(PDF) 28 Page - STMicroelectronics

номер детали AN3984
подробное описание детали  The purpose of this document is to provide a tool to calculate
PDF  46 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3984 датащи(HTML) 28 Page - STMicroelectronics

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Matlab code (functions)
AN3984
28/46
Doc ID 022240 Rev 1
if Order == 1 %1st Order Filter
if FType ==0 % Low Pass Filter
b0 = K/alpha;
b1 = b0;
Coeff_0 = (b1/2.0)/a0;
Coeff_1 = (b2)/a0;
% Always =0!!!
Coeff_2 = (-a1/2.0)/a0;
Coeff_3 = (-a2)/a0;
% Always =0!!!
Coeff_4 = (b0/2.0)/a0;
else
% High Pass Filter
b0 = 1/alpha;
b1 = -b0;
Coeff_0 = (b1/2.0)/a0;
Coeff_1 = (b2)/a0;
% Always =0!!!
Coeff_2 = (-a1/2.0)/a0;
Coeff_3 = (-a2)/a0;
% Always =0!!!
Coeff_4 = (b0/2.0)/a0;
end
else % 2nd Order Filter
Teta = (2*pi*Fc)/Fs;
%Angle from frequency
K = tan(Teta/2);
W = K*K;
DE = 1+(1/Q)*K+W;
Coeff_3 = ((1-(1/Q)*K+W)/DE)*-1.0; % -a2
Coeff_2 = ((W-1)/DE)*-1.0;
% -a1/2
if FType ==0 % Low Pass Filter 2nd Order
Coeff_4 = (W/DE)/2.0;
% b0/2
Coeff_0 = W/DE;
% b1/2
Coeff_1 = W/DE;
% b2
else
% High Pass Filter 2nd Order
Coeff_4 = (1/DE)/2.0;
% b0/2
Coeff_0 = -1/DE;
% b1/2



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