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Recent content by rayhh27

  1. R

    RJ45 7499211122a connection

    Hi, I am intending to use the WE RJ45 7499211122a, however I cannot find any design guideline. My question is there are VC2+ and VC2- on the schematic below. Is it okay if I assume that the VC2+ is the 24V and the VC2- is the ground? Here is the schematic Thank you.
  2. R

    polygon pour on top layer beneath BGA

    Hi, so it is like this there are many vcc, vccd_pll, etc. So like GND they are near each other and I am wondering whether it is ok to connect them using polygon. If it is not enough what kind of information should i provide. Thank you, RH
  3. R

    polygon pour on top layer beneath BGA

    It is FPGA
  4. R

    polygon pour on top layer beneath BGA

    Hi, I am intending to design PCB using BGA IC, I am wondering whether is it not good if I use polygond copper right beneath the BGA package? Why? Thank you. Best regards, RH
  5. R

    Low speed bank Clock pins

    Hi, you said that 5.5 MHz can be driven by logic generated signal, is there any source for this information or it is just based on your own experience? Thank you.
  6. R

    PCB saturn conductor impedance

    So basically, if I use FR4 which has dielectric constant of 4.6, this value will change due to the frequency?
  7. R

    [SOLVED] unconventional cut on eagle

    Hi, this is the link to the item. https://www.molex.com/molex/products/datasheet.jsp?part=active/1051330011_IO_CONNECTORS.xml Thank you. Best regards, RH
  8. R

    [SOLVED] unconventional cut on eagle

    Hi, I am using EAGLE CAD software to design a board. When I want to create a library, the datasheet has this kind of cut for mounting (see on the datasheet). Can anyone help me about how to create such a cut on the board through EAGLE? Thank you. Best regards, RH
  9. R

    PCB saturn conductor impedance

    Hi, I have been using pcb saturn for calculating my trace impedance. This time I want to calculate impedance 50 ohm for the RF signal. My question is, in the frequency tab, the frequency that i should put is 1575.42 MHz (GPS freq) or is it something else? Thank you. Best regards, RH
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    [SOLVED] ESD protection diode

    Hi, I am intending on using an ESD protection diode for my GPS antenna, however when I search for ESD protection diode, I have come across 2 difference diode, which look like the attached images. Can anyone tell me what is the difference in both ESD protection diode? From reading in the...
  11. R

    [SOLVED] SPI protocol on MAX10

    I see that is the answer. Thank you and sorry for being ignorant.
  12. R

    [SOLVED] SPI protocol on MAX10

    Hi, I am intending on using SPI on MAX10, my question is, 1. Is it okay to connect the MISO, MOSI, CS_N on the normal I/O pins on max10? 2. The speed of the SCK is 5.5Mhz is it actually necessary to connect it to PLL out or a normal IO or even a PLL in will work just fine? Thank you for your...
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    Low speed bank Clock pins

    As usual thank you very much for giving such a clear answer.
  14. R

    Low speed bank Clock pins

    MAX10 high speed low speed pins Hi, I have yet another simple questions. 1. I really want to understand what is the difference between high speed and low speed io pins on max10. I tried to look around but cannot find an answer about this. Can anyone help? 2. To send clock signal from MAX10...
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    Circular typed trace

    Hi, I have a question regarding keeping the length of line from an IC to FPGA the same. I want 4 different traces to be almost exactly the same length. I am using the circular typed trace to make up the same length between each line. Here is my example, my questionis is, is this kind of trace...
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