AN3984 datasheet(28/46 Pages) STMICROELECTRONICS

부품명	AN3984

상세설명	The purpose of this document is to provide a tool to calculate

PDF	46 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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28 / 46 page

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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