Is there any example to evaluate the effect of PCB?

since you konw the PCB has very important effect to the analog circuit performance. Is there any example to evaluate the effect of PCB? I think the example is the best teacher. can anybody help me ?

can anybody help me?
thanks a lot!

xuexucheng said:

can anybody help me?
thanks a lot!

Click to expand...

perhaps you need to check from Archives of Analog Devices for application note published article in 80s.Funnily, the article starts with " while modern day engineers agree that I=V/R, they don't realise that V=IR......

while making a layout for power lines of amplifiers, feeding power from the signal input side of the pcb, troubles the design as the voltage drop across the tracks due to current drawn by final stages, becomes an unwanted and false input to the front end amplifier stages.

I fondly remember one of my mentors who always joked that " most people know as they studied Ohm's Law. But we have to honor those who are able to understand that it helps them in times of real trouble. At that juncture most practicing persons forget to use it logically to overcome the issues......"

I agree, that resistance is probably the most basic PCB effect, present already at DC. As the original question is referring to analog circuits in a very general sense, it should be mentioned, that there are also capacitance, self and mutual inductance and transmission line effects.

I agree, that resistance is probably the most basic PCB effect, present already at DC. As the original question is referring to analog circuits in a very general sense, it should be mentioned, that there are also capacitance, self and mutual inductance and transmission line effects.

Click to expand...

Yes, resistance capacitance self and mutual inductance and transmission line effects are complete, I think.

We often can do and do some qualitative analysis. But is there any quantitative analysis example? Afterall, qualitative analysis can not give the evaluated results. We not noly need to know how to decrease the PCB effect, but also need to kown the result of the PCB effect.

Thank you!

example is the best teacher,
can anybody give an example?
thank you.