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Opamp Bootstraped AC Amplifieropamp phono preamplifier.sch
% Matlab codeclose all;clear allG=1000;f0=1;f1=500;f2=50;f3=2122;C2=10*10^-9;R2=1/(2*pi*f2*C2);C3=(2*pi*f1*C2-1/R2)/(2*pi)/(f3-f1);R3=1/(2*pi*f3*C3);R1=(R2+R3)/G;C1=1/(2*pi*f0*R1);disp(['C2=' num2str(C2) ' F']);disp(['R2=' num2str(R2) ' ohms']);disp(['C3=' num2str(C3) ' F']);disp(['R3=' num2str(R3) ' ohms']);disp(['C1=' num2str(C1) ' F']);disp(['R1=' num2str(R1) ' ohms']);f=logspace(0,log10(30*10^3));H=1+(R2+R3)/R1*(1+j*f/f1)./((1+j*f/f2).*(1+j*f/f3));subplot(2,1,1);semilogx(f,20*log10(abs(H)));axis tightxlabel('Frequency (Hz)');ylabel('dB Magnitude(H)');axis tight;grid onsubplot(2,1,2);semilogx(f,angle(H)/pi*180);axis tightxlabel('Frequency (Hz)');ylabel('Phase(H)');grid on
Opamp Notch Filter
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