Capacitive coupling transfers energy between devices connected through an electrical network using capacitors. It can break a DC circuit in analog circuits and prevent interference in digital circuits. Unintentional coupling can cause electrical noise, which can be corrected by separating wires or creating a non-conductive wall. Desired coupling is achieved by placing wires in close proximity or wrapping them around each other, and using capacitors for digital or analog signals.
Capacitive coupling is referred to in electronics as the transfer of a common energy to several devices connected to each other through an electrical network. Energy transfer occurs using several capacitors between the circuits. It can also be done in sequence with respect to the original power signal that is intended for coupling.
In an analog circuit, the purpose of capacitive coupling is to break a DC circuit, which is why the capacitor used is referred to as a DC blocking capacitor. In digital circuits, capacitive coupling is most often used in different types of communication devices as a way to block any possibility of interference with a signal or to prevent any type of voltage or power imbalance from forming. These imbalances are often associated with signal amplifiers, especially when input and output wires couple, causing what users might hear as feedback.
Capacitive coupling can also occur unintentionally, when a circuit has a frequency running through it and another wire is nearby. In such cases, the fed wire may couple with the wire that is projecting bandwidth or frequency and intercept or simply interfere with the original wire signal. The reverse can also occur, where the fed wire interferes with the frequency, causing noise or interference with the input signal being processed.
When capacitive coupling occurs unintentionally, usually because two wires powered at different bandwidths or voltages are too close together, an unwanted effect called electrical noise occurs. This noise can manifest itself in signal interruption of the input or output signal of the product or in background noises such as high-pitched hissing. Alternatively, the product may simply not work as originally intended. When this occurs in the manufacturing process, most product manufacturers correct the problem by separating the wires in the wiring diagram or by creating a non-conductive wall between the two wires.
However, when a coupling effect is desired in an electrical bandwidth device, the two wires that would normally be separated are placed in close proximity to each other. It may also be provided in the schematic that the two wires wrap around each other to create the environment where the maximum amount of coupling is desired. When the coupling effect between both digital or analog circuits is desired, they are coupled together through the use of capacitors which operate separately, depending on whether the signal being fed is digital or analog.
Protect your devices with Threat Protection by NordVPN
