Receiver Sensitivity Calculation

Discussion in 'Wireless & RF Design' started by Cerkit, Oct 19, 2018.

  1. Cerkit

    Thread Starter Senior Member

    Jan 4, 2009
    286
    3
    Hi,

    I have a receiver with an impedance of 50Ohms. I have calculated the minimum receiver sensitivity to be -10dB.

    Is there a way I can express the sensitivity in Volts? Can I convert the dB to power then calculate V = P/(R^2)

    Thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
    19,522
    3,977
    Hello,

    It can not be -10dB.
    It is likely -10dBμV.
    So the level is 10 dB lower than 1 μV.
    The sensitivity will be about 0.3 μV.

    Read the attached PDF for more info.

    Bertus
     
  3. Cerkit

    Thread Starter Senior Member

    Jan 4, 2009
    286
    3
    Hi,

    Please help me understand. I have a transmitter of 10watts (40dB) and I need to know what the minimum sensitivity of my receiver needs to be if I have losses of 20dB and need to allow for an additional margin of 30dB. Which is why I got -10dB.

    So was trying to convert the sensitivity to a voltage value.

    But I still need to get my head round a few things clearly.
     
  4. bertus

    Administrator

    Apr 5, 2008
    19,522
    3,977
    Hello,

    Decibels are a ratio between powers or voltages.
    There must be a reference to calculate the power or voltage.
    Read the PDF I gave you.

    The power of your transmitter is quite high with the mentioned 10 Watts.
    It is quite normal for a communication receiver to have a sensitivity of the 0.3 μV, I mentioned.

    Bertus
     
  5. John_2016

    Member

    Nov 23, 2016
    55
    5

    10W are not 40dB, but 40dBmW often the W of dBmW is omitted when for instance working with microwave circuits if all values are small.
    Not to be confused with dBmV

    John BG
     
  6. John_2016

    Member

    Nov 23, 2016
    55
    5
    it would greatly assist the readers of your question to have the question supported with more details like:

    1.- transmitter specs: model, circuit, block diagram, a photo
    2.- same for the receiver:
     
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