MATLAB Analysis and PSpice Simulation of an OP amp Circuit

[@WonYYang]

The related MATLAB m-file and PSpice opj-files can be downloaded at
kr.mathworks.com/matlabcentral/fileexchange/175020-matlab-analysis-and-pspice-simulation-of-an-op-amp-circuit.
The files listed in my books can be downloaded at my portfolio webpage: wyyang53.github.io/myportfolio1/.
%cir04e09_2.m
clear, clf
syms s Vis
R1=500; R2=40; R3=1e3; R4=1e3; K=(R3+R4)/R3; C1=1e-3; C2=1e-3;
sC1=s*C1; sC2=s*C2; K=(R3+R4)/R3;
Y=[1/R1+sC1+1/R2 -1/R2-sC1*K; -1/R2 1/R2+sC2];
Vs=Y\[Vis/R1; 0]; % Eq.(E4.8.3)
Gs=subs(K*Vs(2),Vis,1) % Eq.(1): Transfer function
% Transient (Time) response
f1=1; w1=2*pi*f1;
Vis=2*w1/(s^2+w1^2); % Input transform
Vos=Gs*Vis; % Output transform Eq.(3)
vo=ilaplace(Vos) % Inverse Laplace transform
vo=ilaplace_my(Vos) % How about using my ILT function?
t0=0; tf=6; N=600;
t=t0+(tf-t0)/N*[0:N]; % Time vector for [0,6]sec
vot=eval(vo); % Eq.(E4.9.3) with the time vector substituted for t
subplot(221)
plot(t,real(vot)), shg
set(gca,'fontsize',9), set(gcf,'color','white')
% Frequency response
syms w
Gw=subs(Gs,s,j*w)
f=0.1:0.1:10;
Gw_=eval(subs(Gw,w,2*pi*f));
Gm=abs(Gw_); % Magnitude of frequency response
Gph=rad2deg(angle(Gw_)); % Phase of frequency response
Gw1=eval(subs(Gw,w,w1)); % Frequency response at w=w1
Gw1m=abs(Gw1); % Magnitude at w1
Gw1ph=angle(Gw1); % Phase[rad] at w1
Gw1ph_deg=rad2deg(Gw1ph);
subplot(222)
plot(f,Gm, [f1 f1],[0 Gw1m],'m:')
subplot(224)
plot(f,Gph, [f1 f1],[0 Gw1ph_deg],'m:')
fprintf('Gw(f) with f=%4.1f = %5.1f

[@nshuang1009]

Hi, Dr. Yang, the book is interesting. For circuit design and analysis, for example the preamp design for Mic, do you suggest Matlab/Simulink or Pspice? What's the different while simulating the circuit using Matlab or Pspice? Or what's the pros/cons using Matlab/Simulink to simulate the circuit? Thank you

[@WonYYang]

1. MATLAB can be used for design, analysis, and simulation while PSpice for analysis and simulation, but not for design.
2. MATLAB can easily repeat the same process with many different values of parameters while PSpice takes time to change the values of parameters that can be automated.
3. Compared with MATLAB simulation, PSpice presents realistic models so PSpice simulation feels like a hardware experiment and I think, it is better for mistake-proofing.
That is why I recommend performing PSpice simulation after MATLAB design/analysis.
4. If you are professional, how about trying SLPS that is a co-simulation tool using PSpice together with MATLAB/Simulink? (resources.pcb.cadence.com/schematic-capture-and-circuit-simulation/system-level-design-with-pspice-and-matlab) Regrettably, I have no experience of using the tool since it is too expensive for me. I wish you to share your experience of using it in the future.
Thanks for being interested in my book. (wyyang53.wixsite.com/mysite/publications)

[@alessio8309]

Dear Mr. Yang,
I am an electronic engineering student in Italy, and unfortunately, I am unable to obtain a copy of your book MATLAB for Digital Communications because it cannot be shipped here. Could you kindly advise me on how I might be able to access it?
Thank you very much for your time and assistance.

[@WonYYang]

1. The e-book can be bought for $45 at play.google.com/store/books/details?id=3homEAAAQBAJ&rdid=book-3homEAAAQBAJ&rdot=1.
2. The hard copy can be bought directly from me by sending $110 through PayPal. If you send me (at [e-mail]) an email message, I will inform you of my PayPal account.
FYI, I have several times shipped my book to Italy, e.g., Via Poccetti, ..., 50125 - FIRENZE, CASALECCHIO DI RENO, BO 40033, .. Sondrio, SO 23100, ..which costed me about $60. I don't know why the shipping cost to Italy is so expensive.
I recommend you to buy the e-book version that is much cheaper.
Thanks for being interested in my book.

[@alessio8309]

@@WonYYang Perfect, I will proceed with the digital format, and later I will also purchase the DSP book, as I find your approach to explanations unique and highly educational. Thank you very much.

[@WonYYang]

@@alessio8309 Thank you for recognizing the value of my book.