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Results tagged with decoupling-capacitor
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user 199993
A capacitor, usually ceramic, used to provide instantaneous energy to a local circuit.
0
votes
Why are decoupling capacitors on the VIN of a chip when electrons are flowing from - to + in...
They don't work together, they are two completely different concepts.
Bypass caps are needed close to the positive and negative terminals of any chip, regardless of which way electrons or current flow …
- 159k
8
votes
Accepted
Decoupling capacitor size per datasheet
The datasheet is from 2011. The part may be even older.
Back in 2011, or when the datasheet was first made, a 0805 capacitor was typical size and good enough for decoupling.
But we can't really know t …
- 159k
1
vote
Accepted
Decoupling capacitor high frequency impedance value
The reason why capacitors are used is simply because even a non-ideal capacitor with some ESL connected directly to chip supply pins is still much better than not having a capacitor at all or having i …
- 159k
3
votes
Accepted
Can I use higher caps for input/output of MCP1700?
Based on MCP1700 datasheet:
Input capacitor of 1uF is recommended for most applications. Larger values can be used to improve AC performance.
Output capacitor of 1uF is required for typical applicatio …
- 159k
12
votes
How do capacitors stop voltage spikes?
You have drawn an ideal circuit, not a real world circuit, so in ideal world these things don't matter. In real world, they do.
For example wires are not superconductors, and electricity does not move …
- 159k
2
votes
Decoupling capacitors in a bjt amplifier, polarity
The amplifier output has positive DC bias. If it is connected to something that has less DC bias, then capacitor positive side would be on amplifier output.
- 159k
5
votes
Accepted
What is the function of these caps on the pcie lines?
Yes, those are AC coupling capacitors. The PCIe specification requires the lanes to be AC coupled with a 220nF capacitor.
- 159k
9
votes
Why might one of these decoupling capacitor schematics also include an inductor and the othe...
The inductor with capacitors filters noise and ripple so that the power to thermal sensor is clean so it can measure temperature accurately.
The other set of capacitors is for generic digital IO which …
- 159k
1
vote
CP2102 bypass capacitors
Reset may not be directly connected to 3V3, it is an open-drain input/output so it must be pulled up via resistor.
And since the power pins are next to each other, you can draw all four caps but mount …
- 159k
4
votes
Could I change decoupling capacitors values on ATmega power pin?
There is no bypass cap value that is theoretically required.
For example, AVR hardware design considerations suggests a value of 100nF.
So of course you can change the value within reason.
It is unkno …
- 159k
0
votes
ESP32-H2 doesn't work fine when powered via external power supply and 3V3-Battery pin
The VBAT pin can't used for powering the board.
It is used for powering the real-time clock and small part of the memory from a backup battery, while in deep sleep mode.
- 159k
1
vote
Why does impedance decrease in an MLCC as frequency increases?
An MLCC capacitor has smaller ESR than electrolytic or tantalum. Due to physical construction and size, the ESL is also lower than on electrolytics. The MLCC curve still approximately follows that cur …
- 159k
1
vote
What are some of the reasons for voltage spikes in voltage regulated DC circuits?
The chips may consume current in pulses (think a clock or microcontroller running at 1 MHz).
When connecting such spikey current consumer ICs with long wires (on PCB) to voltage regulator, the stray …
- 159k
1
vote
FPGA decoupling capacitors
It's not an exact science - usually you get an estimate how your design will consume energy in an FPGA and some margin is added and that's what you need to provide.
Later you ask what's the difficulty …
- 159k
1
vote
Forgot to decouple RFM69HCW
It seems to be necessary to do a new board anyway if you want to fix any errors.
Otherwise you could just solder on extra bypass caps and hack the board to work.
For example the regulator feedback pin …
- 159k