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7

In general you want to minimize the loop area when probing fast signals. So, as a rule of thumb, you should select the ground connection that minimizes the loop area. Now this is only in general. There may be good reasons to use the capacitor ground. This is due to the resonances in the ground plane. Your ground plane will not be zero volts everywhere for ...


3

Your assumption is correct to use this pad. But consider what rise time you expect and ringing error to occur from the probe if looking at <5ns rise time. The criteria for analyzing a bad choice of gnd. Is V=LdI/dt. Where f-3dB=0.35/dt (10~90%) and L=~0.5nH/mm the distance of the shared ground current of the observed square wave rise time. The probe ...


3

I suspect that this circuit is intended to use a single 12 volt power supply, with the negative terminal of the supply connected to the circuit ground. The power input labelling is misleading - it appears to imply a total 24 volt supply (+12 and -12) rather than a single 12 volt supply. Test point 4 and the test point connected to Ground are just handy ...


2

Is it a good idea to pour the entire bottom layer as GND? Or it can be on the Top layer too? It's usually a good idea to fully pour the bottom layer and, you can optionally try to flood the top layer too and connect it to the bottom full pour with vias every centimetre or inch (not critical on this design by the sounds of it). I would also suggest you ...


1

1 and 2) I read that as chassis ground symbol, so negative supply pin is just connected to a metal chassis. This and the fact that the op amps do not use ground as reference but it is biased to half of the input supply pins would suggest that this is a single supply device so it needs single 12V supply and 0V ground, not dual +/- 12V supplies. 3) In general,...


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