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  1. J

    Where does this voltage come from?

    I am assuming it is 0.7 V because that is the Vbe when the BJT is active, but could you give a brief the process of how to analyze this circuit?
  2. J

    Where does this voltage come from?

    Hello guys, I had a quick question about one of the exercises of my electronics book. Step #1 says that I should do: (5 - 0.7)/(10 + 101 * 1) = 0.039 mA However, I can't seem to find where the 0.7V comes from. I simulated the circuit in Multisim and i'm measuring the voltages everywhere...
  3. J

    Simple program in assembly using Tiva C launchpad?

    Hey guys! I just got a new Tiva C MCU. It's architecture is ARM, and I have no experience programming in assembly using said architecture. To start, I'm trying to run a simple program that puts a value in a register. In an MSP430, the project I'm trying to do would look something like this...
  4. J

    Are these courses worth it?

    Hey guys, I'm an undergrad in computer engineering. This past summer I worked as a research assistant in the robotics GRASP Lab at the University of Pennsylvania. This experience with robots has driven an interest in me in Control Systems (a class that computer engineers don't usually take)...
  5. J

    Benefits of learning about networking?

    Hey guys! I'm taking a course this semester on Networking Fundamentals. Our professor has given us the opportunity to be able to take tests by Cisco to become CCNA certified for free. I don't know much about networking yet, so I was wondering how much of a big deal it is to be a CCNA...
  6. J

    Simple Seven Segment Counter Project Help?

    Hello Guys, I am trying to do a simple digital electronics project where I put two seven segment displays and once I connect the voltage source, the displays start counting automatically from 00 to 99. Here is a video of exactly what I want to do: My group and I found the attached...
  7. J

    Simulating a NAND/AND gate in Emitter Coupled Logic?

    Homework Statement I need to simulate a AND/NAND gate with Emitter Coupled Logic. As i'm sure that most of you know, ECL is mostly used to make OR/NOR gates, so finding out how to make a NAND/AND gate is not as easy as it sounds. Homework Equations The Attempt at a Solution I...
  8. J

    Voltage Transfer Characteristic in Multisim?

    Homework Statement Hey guys. I am trying to calculate the Voltage Transfer Characteristic (VTC i.e. Vout vs. Vin) of a simulated circuit in Multisim but for some reason it doesn't appear to be working. I pressed Simulate --> Analyses ---> DC Sweep --> Selected the input pulsed voltage as...
  9. J

    Value of Vout in PMOS Inverter?

    It could also be Vout = id * Rd.
  10. J

    Value of Vout in PMOS Inverter?

    Hey guys. I am simply trying to derive the equation for Vout in a PMOS inverter (attached). I know that in an NMOS inverter (which has the resistor in top of the transistor instead of the bottom) the equation for Vout is: Vdd - id*rd. But how does the resistor being in the bottom change...
  11. J

    How to design an XOR with these gates?

    I need to design an XOR with 2 NANDS, 1 NOR, and 3 inverters. Is it possible? I can't seem to find how to do it now.
  12. J

    Designing an XOR gate

    Homework Statement Design a 2-input XOR with the following specifications: RL = 1KΩ VDD = 1.8V VOL = 0.1V VOH = 1.7V Homework Equations Triode: Id = μnCox W/L VDS (VGS - Vt - VDS/2) Cutoff: Id = 0. The Attempt at a Solution Searching on my book I found the image...
  13. J

    Good PDF Merger program or site?

    Hey guys. I need to merge about 7 PDF's but a few of them are about 80MB in size. I've tried a few good PDF pages from around the web but they all seem to have about 50MB in limit. Could anyone suggest me a good program that has no limitations to size of PDF's? Preferably free but if not...
  14. J

    How to find W/L?

    Here I will upload the pictures, just in case the links don't work.
  15. J

    How to find W/L?

    How to find W/L?? Homework Statement The exercise already tells me that the value of W/L is 2. However, I can't seem to understand where that result came from. I'd like to know how I can get to that conclusion. Here is the exercise with the graph of the inverter: Inverter image...
  16. J

    How does my book come to this conclusion?

    I'm starting my Digital Electronics course and I'm having trouble understanding how this example from my book gets to it's conclusion. It's about designing an inverter with certain specifications, but how do I find the value of W/L??? How do I get the 2 that the answer says? Here are the...
  17. J

    Capacitors, why even bother?

    @cpatel23 Capacitors are great for quick discharges of energy that batteries could only dream of doing. The classical example is the flash of a camera. It would take a battery a long time to discharge the needed energy for the flash, and it would be beyond infuriating to have to wait...
  18. J

    Calculating Transfer Function off Bode Plot?

    First thing you need to do is turn the G(s) in a general form i.e. make it 3 * 5 * (s/3 + 1)(s/5 + 1) etc... After that, you take whichever constant you get (from the 3 * 5 divided by whatever you get in the denominator). Let's call that constant K. You evaluate 20log(K) and you will get a...
  19. J

    MATLAB Graph Piecewise Functions in MATLAB?

    Hey guys. I need to graph a piecewise function in MATLAB and I don't know how to do it. On top of that, it is also in radians: f(θ) = (80/∏2) θ, -∏/2 ≤ θ ≤ ∏/2 (80/∏) - (80/∏2) θ, ∏/2 ≤ θ ≤ 3∏/2 How do I graph it in MATLAB? And other than that, is there a way in MATLAB that I can take...
  20. J

    Converting periodic function from radians to time?

    Homework Statement Hey guys. So I have this homework exercise where I have to convert the following periodic function in radians into a periodic function in time. f(θ) = (80/∏2) θ, -∏/2 ≤ θ ≤ ∏/2 (80/∏) - (80/∏2) θ, ∏/2 ≤ θ ≤ 3∏/2 Homework Equations θ = ω0 t ω0 = 2∏/T...
  21. J

    How to measure the transfer function in Simulink?

    Ok thanks a lot! One more quick question. I am trying to simulate this circuit (quite complicated) and I can't seem to get an output signal that seems sinusoidal. I think it has something to do with the Refine factor, because when I simulate simpler circuits I DO get a good sine wave. Do you...
  22. J

    How to measure the transfer function in Simulink?

    Let's say I simulate a simple filter in simulink and I want to see the transfer function graph (bode plot) of it. What do I do to get Vout/ Vin? I tried using the "PS Divide" Block and divide the output voltage and the input voltage, but that didn't work. Could anyone help me out here? This...
  23. J

    [Easy] What am I doing wrong here?

    Hey guys! Im new using Simulink. I was trying to simulate a circuit with an AC voltage source but the graph I get isn't anywhere near a sine wave. What do I need to put to the model to make it work?? Model: http://i1226.photobucket.com/albums/ee410/jean28x/simulinkpic1.jpg Graph I get...
  24. J

    Calculating Transfer Function off Bode Plot?

    Hey guys. I was wondering if anyone could give me some hints or help me understand well how to get transfer functions off bode plots. Here is an example I need to solve: http://i1226.photobucket.com/albums/ee410/jean28x/bodeplotcalc.jpg
  25. J

    How do I see the gain from this Bode plot? (simple)

    Ok I see it now. 9.54 = 20 log10 (G) 0.477 = log20 (G) 10 0.477 = G 2.99 = G Thank you very much.
  26. J

    How do I see the gain from this Bode plot? (simple)

    This is the Bode plot of a Broadband Bandreject Op Amp amplifier. The exercise says this: I know that in order to get both cutoff frequencies I need to subtract 3 dB from the plot, but how do I get the gain? I would think that the gain is 3 dB because it is also the distance between the top of...
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