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Recent content by sapphire_2010

  1. S

    PCB Reflections when trace move from one trace to other

    your answer seems correct. A ground stitched VIA or a stitched capacitor is required when changing reference layer or if a signal is routing in multiple layer. This is to avoid EMI issues. You also need to make sure to re-calculate trace impedance for those layers where transition is happening.
  2. S

    Import to Altium designer from Protel pcb

    Protel 99 SE uses the design database/ DDB to store design files. There is an option in Altium designer file >>import... ddb file.
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    Import to Altium designer from Protel pcb

    Use File>> Import wizard
  4. S

    Convert Gerber files to CAD format

    CAM350 has an option to export Gerber data to CAD format (including GenCAD, Pads, Altium & Zuken)
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    how to design boards using high speed designing techniques

    Books: Right the first time is a useful book for beginners as mentioned above. High Speed Digital Design: A Handbook of Black Magic Hardcover – by Howard Johnson Signal & Power integrity by -Eric Bogatin There are several free calculation tools available on internet. You can check them. I found...
  6. S

    [SOLVED] need some help on pcb layer information

    1. To meet standard board thickness two or more pcs of prepreg is used. Its common practice. Make sure you request any stackup always mention if there is any impedance matching requirements. Impedance depends on P/P & Core thickness & PCB material as well. 2. Usually same material is used for...
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    PCB surface finished

    beside reliability, surface finish requirements depends on how frequently you need to plug in /plug out board & components... Certain areas require thick plating. For edge finger (Hard gold) 50uin Au over 200uin Ni is recommended. If you use any smt socket (for your chip/ic) or any smt plug in...
  8. S

    LDO voltage regultor for 1V output & 3A current

    Hi , I was looking for a LDO voltage regulator (SMD). Vin=4-6V & Vop min 1 volts (adjustable) with 3A capability. any sugession would be appreciated.
  9. S

    Saturn inductance calculator

    Please see attached picture for trace inductance 80mil &100mil (1 & 2 Oz) using Polar. Hope it will help
  10. S

    Saturn inductance calculator

    Try Polar Instruments tool or let me know the exact value for below parameters so I calculate for you. By the way what is the board material?
  11. S

    How to get xy coordinates for circle or any shape from Autocad 2013

    Hi marce, I have attached the dxf. Around 1000+ shapes/circles. thanks
  12. S

    How to get xy coordinates for circle or any shape from Autocad 2013

    Hi fellows, I would like to know, how to get xy location (co-ordinates) of circles or any shape drawn in DXF, using Autocad 2013. Is that possible to export Autocad DXF/DWG in text format to get those locations? I have dxf provided by my client & they may want to get xy location of those...
  13. S

    About high speed pcb deigning technique

    see application notes (Texas Instruments); it's good for a novice: **broken link removed**
  14. S

    PCB to gerber file help please

    Hi Pls upload the pcb file to have a look.
  15. S

    Trace width & air gap for 85 ohm impedance

    Hi Fellows, I wonder if anybody could help me to verify the Trace Width to match 85Ohm impedance for Differential pairs (surface microstrip) for a two layer board. Currently I have used 12mil/0.3mm trace width with 5.5mil separation. TOP side would have these pairs & BOT would be a GND copper...
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