Thank you for not letting this sit on the internet and actually showing all the different cases! You and Bogatin were right all along, people just confused these cases. And to be honest if I would have been sceptical to say the least as well, so good on them for asking, because I think this isn't intuitive at all! (Maybe if you can solve numerical equations in your head its intuitive)
This is where I wonder if Zach and I are speaking the same language. In analog, what we call a guard trace is typically used to protect a *single* signal trace from interference and is driven to the same voltage as a high impedance input, e.g. the "virtual ground" reference of an op amp.
In digital guard trace is meant to literally refer to a trace, but what matters is how it is connected at each end (usually ground at one or both ends). In the audio case it sounds like it's driven at one end and terminated at a high impedance at the other end, do I have that right?
@@Zachariah-Peterson Close. The guard is driven to a low impedance reference voltage, usually the op amp's virtual ground. The potential victim trace goes to the op amp's high impedance input. The guard is often a ring around the input. Depending on the implementation, there may also be an RF bypass capacitor to shunt aggressor noise to chassis or system ground, like the one I called out on a connector in another recent video of yours.
Thank you for not letting this sit on the internet and actually showing all the different cases! You and Bogatin were right all along, people just confused these cases. And to be honest if I would have been sceptical to say the least as well, so good on them for asking, because I think this isn't intuitive at all! (Maybe if you can solve numerical equations in your head its intuitive)
Brilliant, thank you.
thanks a lot...
This is where I wonder if Zach and I are speaking the same language. In analog, what we call a guard trace is typically used to protect a *single* signal trace from interference and is driven to the same voltage as a high impedance input, e.g. the "virtual ground" reference of an op amp.
I think the different languages are essentially analog and digital. Or high and low impedance.
In digital guard trace is meant to literally refer to a trace, but what matters is how it is connected at each end (usually ground at one or both ends). In the audio case it sounds like it's driven at one end and terminated at a high impedance at the other end, do I have that right?
@@Zachariah-Peterson Close. The guard is driven to a low impedance reference voltage, usually the op amp's virtual ground. The potential victim trace goes to the op amp's high impedance input. The guard is often a ring around the input. Depending on the implementation, there may also be an RF bypass capacitor to shunt aggressor noise to chassis or system ground, like the one I called out on a connector in another recent video of yours.