Another question I asked about Power Supply Noise pushed me to ask this question.
The background is as follows: I have a design with PD (Photodetector) and Opamp at medium frequency (couple hundred KHz). I am trying to test my design when it come back. I am looking at power supply noise, opamp supply noise and opamp output noise. I realized, there is more to it than just touching the probe. People talk about power loops, having special cables etc.
I will spin another board in two weeks and I wanted to ask, if you are designing your board now, what type of test points or elements you place on your board so that you can measure the noise accurately. We are talking about <20mV type signals.
Bonus question: The output of the opamp is connected to an ADC of the processor. Could I simply run the ADC and plot that to gain a deeper understanding of the noise compared to connecting my cheap scope?