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how to estimate the noise caused by pcb

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xuexucheng

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I can use the method in the great books to lower the noise caused by PCB. however, I often design analog and digital mixed system. When I have finished the design, my boss will ask me how low the noise of the system. What I can say is just I don't konw. Yes, I can use the method to lower the noise, but it is very hard to give the quantity of noise caused by PCB. Do you have the noise estimation method or some examples or some other books or papers? Software simulation, I think, can also not give the answer, because the system have analog parts and digital parts and ADC parts. I can use the PSPICE and Cadence PCB simulation software.
This question is the most important question for me. ^_^
 

Strictly spoken, a PCB causes no noise. Apparentling, you're referring to the role of PCB design in propagation of interferences from digital to analog circuit parts.

Obviously, you can't analyze it, without knowing which interference sources and which pathes for their propagation exist in your design. E.g. interfering currents propagating through the ground plane, power supply decoupling and filtering, capacitive and inductive coupling. Without knowing about possible pathes, e.g. Cadence signal integrity tools won't help much. Cadence sales will possibly tell different, but it's mainly a matter of experience, empirical tests and measurement.
 
oh
well, How can I do?
My boss need this!

FvM said:
Strictly spoken, a PCB causes no noise. Apparentling, you're referring to the role of PCB design in propagation of interferences from digital to analog circuit parts.

Obviously, you can't analyze it, without knowing which interference sources and which pathes for their propagation exist in your design. E.g. interfering currents propagating through the ground plane, power supply decoupling and filtering, capacitive and inductive coupling. Without knowing about possible pathes, e.g. Cadence signal integrity tools won't help much. Cadence sales will possibly tell different, but it's mainly a matter of experience, empirical tests and measurement.
Click to expand...
 

Thank you very much, FvM, you are a great person!

but it's mainly a matter of experience, empirical tests and measurement.
Could you give some detail explanation.
such as how to measurement, how to do empirical tests.
Thank you!
 

You didn't exactly specify what kind of "noise" your referring to. Because you addressed mixed signal designs, I understood mainly crosstalk of digital to analog signals, that appears e.g. as a noise floor respectively insufficient signal-to-noise ratio. But also violation of EMC rules by conducted and radiated interferences may be a problem. All kinds of "noise" can be measured. Identifying their source and effectively reducing their spread is possibly more complicated. That's where a designers experience comes into play.
 
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