# Search results

1. ### Trying to understand difference equation

Hello, I hope someone can help me with a problem I am having. It is neither homework or coursework, but for my own understanding. I should say from the start, I am one of those people who tend not to be able to see the forset because all the trees are in the way, so I probably will be...
2. ### MATLAB MATLAB FFT question

Hello, I am hoping someone can give me some advice. I need to zero out the DC component of an FFT I have done, so I can get a better look at the rest of the frequency components, so how would one go about doing that? I am not looking the code, just some advice ...I have just really started...
3. ### Trying to understand rewritten equation

Hello, I am hoping someone can help me understand something. I was watching one of the MIT OCW videos and it ran through the following Δf/Δx = (1/(x0+Δx - 1/x0)) / Δ0 can be rewritten as Δf/Δx = 1/Δx (x0-(x0+Δx) / (x0+Δx)x0) But I am not sure how this was done. I hope someone...
4. ### Rearranging equation to find back gate bias

Hello, I am having a bit of an issues rearranging an equation for my solid state electronics class. I seem to have a mental block with this sort of stuff, so I am hoping someone can help. The equation is 0.34 = 1.05((0.64 + |VBS|)1/2 - (0.64)1/2) I know the usual stuff, like + to a -...

Hello. I hope everyone is well. I was just wondering about experience for a recent graduate ...I am doing an MSc in Electronics, and will be spending about 8-9 months in our device fabrication lab on a part-time and then full time basis (full time over the summer). Could this be put...
6. ### Schottky barrier Rectifying characteristics

Hello, A Schottky barrier is said to have rectifying characteristics, which from what I can understand is bad ...but would the rectifying characteristics mean that current passing through the junction would be flat ....level is probably a better way to describe it rather than flat. I only...
7. ### Trying to understand an integration example

Hello. I am having some trouble understanding an integration example we have. I have written it out in the attached pdf. I would be grateful if someone can help me undertand what is going on. I assume you let a = (x-RP)/(√2 ΔRP) da to make the process easier, but I am, not sure how that...
8. ### USB power

Hello. This is probably a silly question. But it is something I haven't been able to find an answer too. When I connect something to my laptop through the USB, I know that there is 5V coming from the USB connection ...there are many pinout diagrams about that show this. But what is the...
9. ### Multiplying and subtracting coordinates

Hello, I am hoping someone can help me understand a problem in a text book. It just assumes you know how to do a littel bit of maths, which I don't, and haven't been able to figure out. S11 = 0.894 \angle -60.6 S21 = 3.122 \angle 123.6 S12 = 0.020 \angle 62.4 S22 = 0.781 \angle -27.6...
10. ### Engineering Designing a matching circuit for maximum power transfer

Hello. I need to design a matching circuit to provide maximum power transfer from a generator with impedance Zg to a load with impedance ZL. The matching circuit has a length of transmission line with impedance Z0 and short circuit or open circuit stub with impedance Zs. I need to design with...
11. ### RC Networks and complex numbers

Hello. I maybe should have put this in the maths section, but it is related to electronics, so I figured here. I am reading Microwave Engineering by Pozar, and in one of the examples, it says that the series RC load impedance is ZL = 60 - j80, so the resistance is 60 Ohms and the...
12. ### Impedance and MOS transistors

Hello. In a class today, the lecturer said, in an introduction to the material that will be covered, something along the lines of "..and the current is kept relatively flat (low?) thanks to impedance ..." Is this because impedance acts like resistance (but in AC circuits), or would there be...
13. ### Wavelengths along a Smith Chart

Hello, This may be something that is more mathematical than electrical, but I figured here was the best place. I am going through a worked example, and there is something I don't understand. The question is as follows Find the imput impedance and return loss (in dB) of the loaded line...