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  1. evol_w10lv

    RAM simulation using Multisim

    Hi! The task is to simulate 8 rows (pins) 256 cells RAM using Multisim. I guess, it's 256x8 RAM, but Multisim gives just various versions of 8Kx8 Asyncronous Static RAM and 2KxRAM (in the picture): Can I use it? Or there is specific soulution to simulate RAM?
  2. evol_w10lv

    Transfer function for RC circuit

    I still have some non understanding here. I have to find coefficient k and time constants T1 and T2. Actually, as you said before T1 =R1*C1 and T2=R2*C2, but is it possible in this circuit or it's just theoretically time constants? I'm not sure, but as there is no amplifier in that circuit...
  3. evol_w10lv

    Transfer function for RC circuit

    It seems to me that I were doing completely wrong before. This time I calculated H(s) using quadripole method and it is: It gives me: Here I can see two corner frequencies as you said it should be. Is it looks correct for you as well?
  4. evol_w10lv

    Transfer function for RC circuit

    But then it suggests that transfer function H(jw) is wrong. I draw Bode graph using Matlab: There I can see only one corner frequency. What am I doing wrong?
  5. evol_w10lv

    Transfer function for RC circuit

    Then R1 || R2 are loads and transfer function looks something like that: And: Or am I wrong?
  6. evol_w10lv

    Transfer function for RC circuit

    Hey! I have got this circuit: So.. I have to find transfer function to graph logarathmic amplitude-frequency response and logarathmic phase-frequency response. As we know H(jw) = output phasor/input phasor Input phasor is total impedance (Z). The impedance of a capacitor is 1/(s*C) =...
  7. evol_w10lv

    Two commutation processes for RL circuit

    Now I'm trying to solve second commutation. I guess I have to use mesh current method with first loop and outside loop. Can you chek my result? System looks complicate to solve it in mathematical way.. that's why not sure about my solution. Or it really should be complicated? And what about...
  8. evol_w10lv

    Power spectral density of signal

    Task is done. Thanks.
  9. evol_w10lv

    Power spectral density of signal

    Just noticed, that I have to integrate back by frequency dw. Then formula should be: But I don't know, how to integrate this and also w0 befrore depended by time also. It seems to me, that you obviously know about this stuff.. so I can believe for you, that after integration I should get back...
  10. evol_w10lv

    Two commutation processes for RL circuit

    Can you chek my solution or, actually, just result of first commutation? I solved it, but I want to be sure about this result to continue with second commutation later.
  11. evol_w10lv

    Power spectral density of signal

    I integrated with your equations and here is result: It's the same as before: If I'm right with all limits, then it should be the correct answer, but, when I use this formula: (inverse formula of spectral density or inverse Fourier trasnsform formula) I should get back s(t) as it was...
  12. evol_w10lv

    Power spectral density of signal

    I found out, that we can't just use standart formula, because a sine wave spectral density has only a delta function at the carrier frequency since the signal contains just one spectral component namely the carrier frequency. Here is something simular, but there's used cosinus. For now I...
  13. evol_w10lv

    Power spectral density of signal

    Yes, of course.. again I made akward mistake in my notes. Then result shoud be: But it don't give same signal as it was at the beggining, when I use inverse formula: What could be wrong there?
  14. evol_w10lv

    Power spectral density of signal

    It's 0, but then all equation is 0, when sin(w*t) = 0 and cos(w*t)=0. Now I'm trying to find solution in other way, using this property: I think that I can try in this way, because s(t) is multiplication of two signals. S1(t) = U*e^(-a*t) and S2(t) = sin(w0*t) What's your opinion?
  15. evol_w10lv

    Power spectral density of signal

    Also I noticed, that we can't use the same "w" in exponent and sinus. So, when I use this formula, then I get: But what about range? Yes, it's from 0 to infinity, but I still don't understand some maths there. I guess, that when limit is 0, than all equation is 0. But what about infinity...
  16. evol_w10lv

    Power spectral density of signal

    First of all, I have to calculate power spectral density S(jw) of this signal: It looks something like that: t>=0 But it seems to me, that I can't use this standart formula: So.. I see that there is signal multiplication- exponent and sinus, but still not clear how to get spectral...
  17. evol_w10lv

    Two commutation processes for RL circuit

    I have to calculate first commutation process (t=0) and second commutation process (t = 2*τ) Both swithes are closing in the given time moment as I wrote before. I'll do this task step by step, that's why here isn't full of my own solution yet. First of all, I want to ask few...
  18. evol_w10lv

    Half-wave Rectifier with Smoothing Capacitor

    Yes, of course! I needed to understand it by my self. By the way, here is code and result, if you are interested. And we can see, that differentials method using aproximation gives almost the same result as standart formula. R=1e3; i0=1e-6; F=50; T=1/F; C=50e-6; fi=26e-3; h=T*0.01...
  19. evol_w10lv

    Half-wave Rectifier with Smoothing Capacitor

    Maybe you can look at code? Is there problem with itterations, that's why discharging line goes straight after first succesive itteration? R=1e3; i0=1e-6; F=50; T=1/F; C=50e-6; vx=0; vout=0; vmax=310; fi=26e-3; h=T*0.01; t=0:0.01*T:0.2; x=1; vout(1)=0 for k=1:length(t)-1...
  20. evol_w10lv

    Half-wave Rectifier with Smoothing Capacitor

    Woow, thank you very much! R=1e3; i0=1e-6; F=50 T=1/F C=50e-6; vx=0; vout=0; vmax=310; fi=26e-3; h=T*0.01; t=0:0.01*T:0.2; x=1 for i=1:length(t) e(i)=vmax*sin(2*pi*50*t(i)); vout(i) = vx(x) * exp(-(i - x) * h /0.05) if e(i)>vout(i) vx(i) = e(i) vout(i) = vx(i)...
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