New answers tagged decoupling-capacitor
2
votes
Accepted
Decoupling capacitor for drone power supply
The capacitor does not "handle rapid voltage changes". What it does do is handle rapid current changes and prevent them from becoming voltage changes. In order to pick a value, you need to ...
- 175k
1
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Accepted
What is the return current path for inner layer routed trace (six layer PCB)
Switching between layer 1 and layer six, here stitching vias are necessary as you have already done. Routing on layer 3 could also be OK as long as you keep in mind how the layer 4 (PWR) is routed. If ...
- 159
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Multiple smaller capacitors on power rail for NeoPixel / WS2812B strip
Many smaller capacitors on the strip would be OK. However, large value ceramics need their rating interpretting correctly. The capacitance is quoted at zero bias and falls at rated bias, down to 25% ...
- 169k
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Do the decoupling capacitors act as capacitive load to the opamp which is used to make a virtual gorund?
Here's what I like to use for regulated bias voltages:
simulate this circuit – Schematic created using CircuitLab
C1 gives you high frequency feedback, stabilizing the circuit against the phase ...
- 4,867
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Do the decoupling capacitors act as capacitive load to the opamp which is used to make a virtual gorund?
Stability of an opamp with a capacitive load depends on:
Load capacitance and ESR
Opamp's output impedance and bandwidth
Load capacitance adds a pole, which adds phase lag and reduces phase margin, ...
- 79.5k
5
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Do the decoupling capacitors act as capacitive load to the opamp which is used to make a virtual gorund?
Yes, they will act as a load and the 1kΩ resistor will make things worse. Typically at least 10x worse. As you can see, typically it will oscillate merrily. you won't see much of that at the fake ...
- 407k
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Do the decoupling capacitors act as capacitive load to the opamp which is used to make a virtual gorund?
De-coupling caps are not an issue if you do things in the right way. A "virtual ground" like this is not the same as a "true ground" which you have with a real +/- split supply. It ...
- 7,298
2
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Do the decoupling capacitors act as capacitive load to the opamp which is used to make a virtual gorund?
Will those decoupling capacitors act as a load to the op-amp?
Yes they will and, your concerns are valid. It would be probably better to use a voltage regulator instead of an op-amp because they are ...
- 465k
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