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When you say "decoupling cap across the supply" do you mean a cap across the regulator's output?davidwong said:Will the decoupling capacitor across the supply cause the oscillation?
lambtron said:When you say "decoupling cap across the supply" do you mean a cap across the regulator's output?davidwong said:Will the decoupling capacitor across the supply cause the oscillation?
If so, what you are talking about is really an output filter cap rather than a "decoupling" cap. In this case, the cap will in fact help to stabilize the supply output, and many supplies require such capacitance to prevent output oscillations.
sachinagg77 said:The decoupling capacitors alone might not lead to oscillations. While simulating to check for the oscillation problem, please include the parasitics [Capacitance, inductance, resistance] associated with the Input/Output Pins. These parasitics togther with the decoupling capacitors can lead to oscillations. Simulations are necessary to make sure that the circuit is stable.
davidwong said:Since decoupling capacitor can be considered to be RLC.
Will the decoupling capacitor across the supply cause the oscillation?
Soben said:davidwong said:Since decoupling capacitor can be considered to be RLC.
Will the decoupling capacitor across the supply cause the oscillation?
I dont know for what application u refer too, but poor decoupling can cause oscillation. If your DC paths are not decoupled properly, they are active, that causes usually low frequency feedback which can end up to instability.
Soben said:davidwong said:Since decoupling capacitor can be considered to be RLC.
Will the decoupling capacitor across the supply cause the oscillation?
I dont know for what application u refer too, but poor decoupling can cause oscillation. If your DC paths are not decoupled properly, they are active, that causes usually low frequency feedback which can end up to instability.
Soben said:davidwong said:Since decoupling capacitor can be considered to be RLC.
Will the decoupling capacitor across the supply cause the oscillation?
I dont know for what application u refer too, but poor decoupling can cause oscillation. If your DC paths are not decoupled properly, they are active, that causes usually low frequency feedback which can end up to instability.
davidwong said:Since decoupling capacitor can be considered to be RLC.
Will the decoupling capacitor across the supply cause the oscillation?