# Recent content by GreenPrint

1. ### Control Systems Engineering - Block Reduction Help

Homework Statement Hello, I'm trying to reduce the following block diagram Homework Equations The Attempt at a Solution I appear to be having some issues in doing this. The first thing that I did to reduce this block diagram was to take the forward path that has 2/(s+4) with negative...
2. ### Autocorrelation Function of a Signal

I actually didn't know this E[F(f(t))F(g(t))] = E[F(t)F(g(t) -f(t))] = R_{FF}(g(t) - f(t))? If I were to try and find the power spectral density of X(t) I would make use of S_{XX}(f) = F[R_{XX}(\tau)]. Were F[] is the Fourier Transform. S_{XX}(f) = F[2*delta(\tau) - delta(\tau - 1) -...
3. ### Autocorrelation Function of a Signal

Hey MathematicalPhysicist, Thanks for the reply. I didn't realize this was so simple. My new attempt at a solution I know that . But I don't understand how this equation is true . It reminds of the simple fact that if LHS = RHS LHS + 1 = RHS +1 But that doesn't seem to be the case here...
4. ### Digital Communication Systems - Autocorrelation

sorry I didn't mean to post
5. ### Autocorrelation Function of a Signal

Homework Statement I'm posting this question here at this point. I am having difficulty understanding autocorrelation in terms of solving the problem below. I don't seem to understand the math behind this. A white noise process W(t) with unity (N_0/2 = 1) power spectral density is input to a...
6. ### Engineering Simple Circuit Problem (Clarification of doubts)

The value for I_x doesn't seem to be correct. I'm not exactly sure how you got the value that you did. The node to the left of the 5 ohm resistor there's only three paths for current to flow through. It looks like your summing the currents at node A when you solve for Ix? If this is the case...
7. ### Engineering Simple Circuit Problem (Clarification of doubts)

Oh ok let me look through this again.
8. ### Engineering Simple Circuit (RL circuit)

What about the voltage across the inductor?
9. ### Engineering Simple Circuit Problem (Clarification of doubts)

When you did your conversion, point B shouldn't be connected to ground, it wasn't in the original problem before the conversion.
10. ### Engineering Simple Circuit (RL circuit)

I would recommend not memorizing such equations. It really makes things complicated when presented with problems that don't fit them. There are several ways you could solve the problem. Do you know the equation for KVL for after the switch is opened?
11. ### Digital Communication Systems - Autocorrelation

Homework Statement A white noise process W(t) with unity (N_0/2 = 1) power spectral density is input to a linear system. The output of the linear system is X(t), where X(t) = W(t) - W(t - 1) Determine the autocorrelation of X(t) and sketch it. Homework Equations Let τ denote a time...
12. ### Article that Explains IGBT well

Hi, I'm an undergraduate EE major and am having trouble understanding IGBT. I understand the basic principle, a PNP transistor in ? (forgot the name) configuration with a MOSFET with a parasitic NPN transistor. I understand that it's a 4 layered device. I however think I would struggle trying...
13. ### Electrical Engineering - Control Systems - Design Via Frequency Respon

My text says that we can find the frequency, ω_{max} at which the maximum phase angle, Θ_{max}, occurs ω_{max} = \frac{1}{T\sqrt{β}} But this doesn't really seem to help since I don't know the frequency ω_{max}, unless it's the bandwidth frequency ω_{BW}, which I don't think it is. My text...
14. ### Electrical Engineering - Control Systems - Design Via Frequency Respon

For a lead network G_{c}(s) = \frac{1}{β}\frac{s + \frac{1}{T}}{s + \frac{1}{βT}} I'm still unsure where \frac{1}{\sqrt{2}} came from though. There's a standard representation for the compensator C(s)? Edit 1: From the characteristic equation 1 + kG(s)C(s) = 0 kG(s)C(s) = -1 kG(s) = -...
15. ### Electrical Engineering - Control Systems - Design Via Frequency Respon

done editing Homework Statement I'm given the following transfer function that represents a physical apparatus G(s) = \frac{X(s)}{F(s)} = \frac{3.333*10^{4}}{s^{2}} I'm asked to design a lead compensator to achieve closed-loop stability. The requirements are that it must have a transient...