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Recent content by richas

  1. R

    USB port/Charger Detection

    All the chargers I have seem to use the Apple scheme. I am thinking of using two uC pins that can both detect shorted data lines as well as be reconfigured as ADC inputs. The USB spec shows comparators and logic gates which, while I am sure would work, is not practical. Rich
  2. R

    USB port/Charger Detection

    Hi, I have a design that uses a USB mini connector connected to a CP2102 USB to serial port IC. The Connector will also be used to charge a LiIo Battery. I will need to detect whether I am connected to a wall charger (high current) or a PC USB port. If I detect the wall charger then I will...
  3. R

    Chip antenna on 4-layer board

    Thank you for the reassurance. Since I have not found anyone addressing this I assumed it was a non-issue but I appreciate the help. Rich
  4. R

    Chip antenna on 4-layer board

    Hi All, I am designing a PCB where there will be a wifi module and associated chip antenna on the bottom of the board. There will be a very short trace between the module and the antenna. I need to calculate the trace width such that the impedance is 50 ohms. The layers go as signal...
  5. R

    [Moved] RF Consultant Needed

    Hi, I am working on a design that includes a high frequency data receiver. We are looking for a consultant to help with the RF section including a PCB antenna. We are a small company and so would prefer an individual vs a company. Anyone have any recommendations? Thank you Rich
  6. R

    4-layers, multiple ground planes

    I have a design that has a 900 MHz receiver and a wifi module on the same PCB. It is a four layer design. My thought is to define three grounds, analog1, analog2, and digital. Each section of the board will have it's own ground plane, both the internal ground and the ground pours. Each...
  7. R

    Generating BFSK, what is the best way?

    I need to generate a high data rate (1 Mbps) BFSK signal at 1 GHz. I have tried using a frequency synthesis board and toggling the VCO voltage but the signal is a mess and non-continuous. What is the proper instrument to do this, a vector signal generator? Thanks Rich
  8. R

    50 ohm matching question

    That is really a good idea. It is always best to have options. Thanks to all for the advice.
  9. R

    Looking for SAW Filter Sources

    I am in the U.S.
  10. R

    50 ohm matching question

    OK, good to know, thank you very much for your help. I will recalculate the microstrip with Rogers 4003. Rich
  11. R

    50 ohm matching question

    The high frequency portion is small, SMA, lna, saw, and then directly into rx ic. Perhaps fr4 would suffice?
  12. R

    50 ohm matching question

    I am using 1oz Cu and FR-4 0.062" Thanks Rich
  13. R

    50 ohm matching question

    I am at 1GHz. I am putting together an RF front end, LNA and SAW, to a receiver IC. The antenna, LNA, and SAW filter all have 50 ohm IO so perhaps I do not need matching. I looking into connecting the components with microstrip, according to a online calculator the trace should be 140 mil...
  14. R

    Looking for SAW Filter Sources

    Does anyone have a source for custom RF SAW filters? I am looking for a vendor that would be responsive to smaller orders. Thanks Rich
  15. R

    50 ohm matching question

    Neewbie.... What is the proper way to connect/match components in an RF front end assuming all have 50 ohm IO? Microstrip traces? LC matching networks, no matching required? Thanks Rich
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