Where to put the capacitor to prevent interference

Can a capacitor remove noise from an IC?

When noise enters a DC current flowing inside an electronic circuit, voltage fluctuations could occur, leading to IC malfunctions. To deal with this, capacitors are widely used to remove noise. This is because a capacitor functions as the simplest noise filter by blocking DC current while allowing noise to pass.

Why do I need a bypass capacitor near my IC?

Dear Mohammed, each wire acts like an antenna collecting extraneous signals (which become noise for your pin) from the remaining circuitry. Having the bypass capacitor close to the IC means that the length of wire exposed to interference is the shortest possible.

Where should a decoupling capacitor be placed?

Based on the principle of decoupling capacitors, we can correctly place the decoupling capacitor at the right location of the PCB layout to gain the optimal performance. The diagram below shows the two possible options of placing the decoupling capacitor, close to the VCC pin and close to the GND pin respectively.

Why do I need a capacitor on my IC?

Dear Mohammed, Orsino's answer is correct. A capacitor is placed across the IC's supply so that any high frequency noise bypasses its circuitry. However, if your capacitor is too far away, inductance due to the PCB tracks will tend to block that noise thus redirecting it back through the IC. To avoid this keep your capacitors close.

Do capacitors reduce noise?

Capacitors, in particular, store electric charges, but they also play a major role in noise reduction. As digital devices become smaller and handle higher frequencies, the low-ESL and low-ESR types of bypass capacitors and decoupling capacitors are becoming more prevalent. Noises have colors? Noises have colors?

Why is a bypass capacitor called a decoupling capacitor?

This capacitor is sometimes referred to as a bypass capacitor because it bypasses noise to the ground, or as a decoupling capacitor because it separates the circuits of the previous and latter stages. This basic characteristic of capacitors can be used for noise management because most noise is from high-frequency AC.