Is there a way to determine RF Noise power in PCB

Hi all,

I have little knowledge for RF circuit design.
Please enlighten me regarding the type of testing which I can determine the noise power in the PCB?

Thanks

Regards,
Yuyee

Is this question related to electromagnetic compatibility or what does "noise power" mean here?

Hi Volker,
I would like to calculate how much power received signal is needed based on the noise power (if noise level is greater than received signal then the received is not working), in addition, SNR can also be calculated. Therefore, I need to know the noise power at first..
Can anyone enlighten me please

You can calculate thermal noise here:
http://www.radio-electronics.com/inf...lculations.php

For 50 Ohm source impedance that is typical in RF systems, it is -174dBm/Hz at room temperature. You receiver input stage will add some noise to this, see -> noise figure.

If you want to do it by hand, you need to learn about calculating noise temperature.

If you want to do it by computer, there are noise tools in ADS/AWR where you can use noise circles to calculate the behavior of your circuit(although u may need the non-linear model of your DUT)

They way WE do it is to measure receiver threshold. Send a modulated signal into the receiver. Then gradually add microwave insertion loss until the bit error rate goes up unacceptably. THAT is your receiver threshold power level....the transmitted power hitting the receiver after the added attenuation.