Lets say I have a circuit which involves an OpAmp and a comparator. They're both single supply running from a noisy USB power supply.
Each component has local bypass capacitors, a big and a small one (10µF and 0.1µF, here simplified as one capacitor).
The comparator drives a load of +20mA and during switching I see the signal feeding back into the OpAmp over the power supply line. This cause my signal to degrade quite a bit and I need more hysteresis that I would like to.
I thought about adding some kind of noise isolation between the two components by placing inductors between them like this:
Inductors are in the range of 10µH and have series resistance around 2Ohm.
Simulation shows that the interaction over the shared power supply is almost non existent afterwards. Also the improved filtering reduces the noise from the USB supply a lot. This is to be expected because it is a CLC or Pi-filter.
The question: Is this a good or bad idea? I'm specifically asking because I've never seen this done in commercial circuits so far.