Bypass capacitor between power and ground

Thread starter lulu1000
Start date Apr 12, 2013
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Capacitor Ground Power

In summary, a bypass capacitor is an electronic component used to filter high frequency noise and stabilize power supply voltage. It creates a low impedance path for AC signals to reach ground, preventing them from affecting the rest of the circuit. There are three commonly used types of bypass capacitors: ceramic, tantalum, and electrolytic. When selecting a bypass capacitor, factors such as capacitance value, voltage rating, and frequency response should be considered. Multiple bypass capacitors can be used in a circuit for better noise filtering and stability, but care must be taken to avoid resonance and ensure proper placement.

Apr 12, 2013

lulu1000

Hi forum!
So I was trying to learn how to use PIC
In the tutorial,they said I should add a bypass capacitor between power supply and ground.
But will the whole thing shorted out because of this connection?Why or why not?

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Apr 12, 2013

dlgoff

Science Advisor

Gold Member

This should answer your question.

From: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capchg.html#c1

Last edited: Apr 12, 2013

Apr 12, 2013

lulu1000

ahh,I see,thanks!

What is a bypass capacitor and what is its purpose?

A bypass capacitor is an electronic component that is used to filter out high frequency noise and stabilize the power supply voltage. It is placed between the power and ground connections to provide a low impedance path for AC signals to bypass the power supply and reach the ground, preventing them from affecting the rest of the circuit.

How does a bypass capacitor work?

A bypass capacitor works by creating a low impedance path for high frequency signals to bypass the power supply and reach the ground. It acts as a reservoir, storing and releasing charge to regulate the voltage and reduce fluctuations in the power supply. This helps to keep the power supply voltage stable and prevents noise from affecting the rest of the circuit.

What types of bypass capacitors are commonly used?

The most commonly used types of bypass capacitors are ceramic capacitors, tantalum capacitors, and electrolytic capacitors. Ceramic capacitors are preferred for their low cost and small size, while tantalum and electrolytic capacitors are better suited for high frequency applications and have higher capacitance values.

What factors should be considered when selecting a bypass capacitor?

When selecting a bypass capacitor, factors such as capacitance value, voltage rating, and frequency response should be considered. The capacitance value should be chosen based on the amount of noise present in the circuit, while the voltage rating should be higher than the maximum voltage in the circuit. The frequency response of the capacitor should also be taken into account to ensure that it can adequately filter out high frequency noise.

Can multiple bypass capacitors be used in a circuit?

Yes, multiple bypass capacitors can be used in a circuit to provide better noise filtering and stability. Different types of capacitors can also be used together to cover a wider frequency range. However, it is important to ensure that the capacitors are properly placed and that their capacitance values are not too high, as this can cause resonance and affect the circuit's performance.