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Recent content by Romansh

  1. R

    Altium Designer 15 - inconsistencies with schematic and PCB synchronisation

    Hi, Have you tried to reset the Unique ID of the problematic components?
  2. R

    differences between low noise and low phase noise ampilifier

    Low Noise amplifiers is one that doesn't adds a lot of white noise (Low Noise figure) Low Phase Noise is one that doesn't have a lot of impact on the phase of the input signal due to non-linearity i.e. AM-PM
  3. R

    Identify jumper cable connectors

    Hi, Try samtec, they have different types of generic cables and connectors and free samples
  4. R

    Problem with Altium (some footprints remain off-grid)

    Did you try to reset Unique Id of the problematic components?
  5. R

    [SOLVED] How we can Decide for set BB gain, IF gain, RF gain???

    Re: How we can Decide for set BB gain,IF gain,RF gain??? Hi, For the transmitter part: 1. You should set most of the gain on BB, since any noise that will be added in last stages, will not be amplified too much, increasing the Noise Floor. 2. For the receiver it is just the opposite, consider...
  6. R

    Spiral inductor substrate and parameter info

    You can use any substrate you want as long as you satisfied with the Er and TanD of the material. It is all about trade-offs, if you want higher BW you should choose higher TanD, but then you will have more dielectric losses. Choosing higher Er will give you smaller structures, but then you will...
  7. R

    Spiral inductor substrate and parameter info

    Transmission lines are very narrow band, so if you need higher BW you should go with the LC circuit. Regarding the units, you didn't mentioned the software you are suing. In ADS you can change your project parameters from metric to imperial and visa versa or to convert it with calculator...
  8. R

    [moved] Circuit to detect 240 or 380 volts AC

    Sure, you can do it that way, just make sure you are using components with the right voltage rating.
  9. R

    question on electrical length in basic patch antenna

    Well, if you noticed there are different types of feeding shown on these pictures. Usually, once the TL becomes 50 Ohm the lengths is not critical. Anyway, you need to simulate in 3D the whole structure.
  10. R

    question on antenna adaptation

    You should look for example at your radiation and cross polarization patterns , efficiency, gain, return loss. Make sure all these and other parameter are in spec over your frequency range.
  11. R

    question on electrical length in basic patch antenna

    If you are talking about the feed of the antenna and it is not part of the matching network, then the length doesn't matter as long as it is 50Ohm TL.
  12. R

    SNR, P1dB relationship

    The P1dB is when your amplifier is starts to compress the output signal. Think about the information that you have in the amplitude of your signal (AM or OOK, or QAM modulations), once this signal is compressed you start to loos information and thus the SNR is degrading. It is happening also...
  13. R

    15 Watt RF Power Amplifier Selection 140-170 MHz

    Hi, It looks like you can squeeze 15W from this device at the required frequencies. You should ask for S-parameters from the vendor and check stability and matching. R.
  14. R

    Should a good RF engineer have a soldering capability?

    Hi, Definitely, a good RF&MW engineer should be very good at soldering. Of coarse, for the small components (0201, 0402, 0603) you should use microscope. R.
  15. R

    Radar Pulse to Pulse phase stability

    The formula is for converting Integrated Phase Noise from deg to DB. So, my question is, if this formula is also applies to Pulse to Pulse stability, if not does anyone know the right one? Again, I'm not asking for the meaning and the purpose this measurement, its just that there are 2 types of...

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