4 ms·
Most of what they're describing is bypass which is the shunting of high frequency noise to ground via capacitors. The capacitors appear as a lower impedance pat
by systems_glitch 4y ago
Most of what they're describing is bypass which is the shunting of high frequency noise to ground via capacitors. The capacitors appear as a lower impedance path for the HF noise to ground, rather than return thru the power supply, whatever that may be.
- rzzzt 4y agoYou can have perfectly smooth supply voltage by using eg. alkaline batteries and still see noise on the power rails each time a digital IC switches a lot of outputs at once. The same caps can also act as reservoirs that work against these bounces.
- systems_glitch 3y agoSorry, it was probably unclear that I meant the source of HF noise is the circuit, not the power supply. You are correct, you need them even with battery supplies.