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Recent content by mspagon

  1. M

    purpose of SRAM precharge

    I'm having trouble understanding the purpose of precharging the BLs during a read operation of a traditional SRAM. Is it because after a previous operation you want a common starting point (both bit lines being 1) so the sense amplifier can begin to sense the change in the BLs? Thanks...
  2. M

    low-pass vs high-pass filter RC fundamentals

    In a very simple RC circuit where there is an AC power source (AC), resistor (R), capacitor (C)... Fundamentally, why is a series circuit with the configuration AC->R->C with the output taken across the capacitor a Low-pass filter WHEREAS a series circuit with the configuration AC ->C->R with...
  3. M

    [SOLVED] What is via stacking?

    I believe that current flow is better in stacked vias.
  4. M

    what will happen if we dont use filler cells?

    Why can't you just close the NWELL by drawing a well between them... i'm pretty sure that's what i've seen.
  5. M

    Split Power Plane - placement?

    I have a mixed signal board with +5 / -5 split planes. How important is it that my capacitors (that are connected to -5 and +5 used for decoupling and stuff) fall directly between the split plane so that each plate is above the corresponding plane? Can the cap be placed anywhere? What if...
  6. M

    [SOLVED] OrCad 16.0 - Sliding PCB components/wires to the left?

    I have to modify an existing PCB in OrCad 16.0. They need to shrink the PCB in the X-dimension by 1-2 inches. I need to grab the components, vias, attached nets on the right edge of the PCB and slide everything over to the left as much as I can. There is room for it, I just need to learn how...
  7. M

    via padstack question

    I have a four layer PCB, TOP/VCC/GND/BOTTOM When I route from Bottom to VCC the via connecting the two has BOTTOM, hole in the ground, VCC, and a little dot connecting to TOP. Why would it even go to top if I'm not routing in it. Also the previous PCB that I am editing has a ton of little...
  8. M

    How to set Color View File Permanantly in OrCad PCB Editor?

    EDIT: YOU CAN USE view -> color view save ALSO: CREDIT TO Ismail.A. Its pretty easy to add the films. This is what I do: 1. In the menu list go to manufacture - Artwork - Film control (tab) Top and bottom films will be there defaultly..just right click on that and add the new film using...
  9. M

    PCB Stackup/Ground Planes/Tradeoffs

    I need +Power, -Power, 2 routing layers, and a ground plane. However, I don't know how to choose my stack-up? If someone could explain all the different possibilities along with the trade-offs I'd really appreciate it. I'm concerned with things such as cost and routing difficulty and EMI and...
  10. M

    Help understanding resistors in front of inst. amp - temperature sensor

    actually, I think the configuration is correct, but I don't know what the 10k and 100k resistors are for... the bridge is before the 10k and 100k, those resistors are after the "input"... so why have a voltage divider on the input of the inst. amp? If you match the picture b) to my circuit...
  11. M

    I have doubt about the Wide Power lines ?

    The larger the path the more electrons can flow I.E. more current... This means the path has a low-impedance...
  12. M

    Light Dependent Resistor light frequency

    My initial guess was no. But, I don't know much about LDR - I found something online...
  13. M

    Methods to design op amp ciruits?

    https://obrazki.elektroda.pl/3817652500_1359058632.jpg Isn't the negative power supply pin on the op amp still connected to "ground"? I might be wrong but I though the negative terminal of the battery was at a 0 potential?
  14. M

    [SOLVED] most simple 101 - Why won't the capacitor discharge?

    Why won't the capacitor discharge when the circuit is open? Is the simulator wrong? I thought the charge would flow directly to ground! In an RC circuit with one resistor, it doesn't matter if the resistor comes AFTER or BEFORE the capacitor does it...
  15. M

    meaning of "metal options"

    I don't have much layout experience but I presume that when a modification needs to be made to a design a "metal-only change" means that the modification will result in only changing the upper metal layers and not changing the base layers such as nwell and substrate. However, could someone else...

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