Umair Gaines
Electrical coupling is a process that involves the transfer of energy or electrical current. This transfer can occur between cells, circuits, or other elements. In the case of cells, electrical coupling allows for the passage of electrical current and small molecules between cells connected by gap junctions or electrical synapses. For circuits, electrical coupling, also known as electric field coupling or capacitive coupling, occurs when energy is transferred from one circuit to another through an electric field or shared electrical line. This can result in crosstalk or interference, which can be influenced by various circuit parameters such as frequency, resistance, and mutual capacitance. Electromagnetic coupling, a specific type of electrical coupling, involves the interaction of electromagnetic fields produced by circuit elements, leading to energy transfer and potential electromagnetic interference (EMI). Understanding the mechanisms of electrical coupling helps in designing effective countermeasures to minimise unwanted effects, such as electromagnetic noise or disturbances.
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What You'll Learn
Electric field coupling
Consider two circuits with a shared return plane. If the return plane had zero resistance, the common impedance coupling would be zero. However, coupling can still occur between the circuits due to the electric field lines that start on one signal wire and end on the other. For instance, if one signal voltage is +1 volt and the other is 0 volts, the potential difference results in electric field lines that start on the +1-volt wire and terminate on the 0-volt wire. This can be represented schematically by a capacitor between the two signal wires.
The coupling capacitance between the wires, known as C12, can be calculated using the formula for the capacitance between two wires. Once the capacitances are determined, the crosstalk due to electric field coupling can be calculated using the same formula used for common impedance coupling. The crosstalk can be influenced by various circuit parameters, such as frequency, source resistance, and mutual capacitance.
To reduce unwanted capacitive coupling, wires or traces are often separated or ground lines/planes are introduced to direct the coupling to ground instead of other signals. This is particularly important in high-frequency or high-gain analog circuits, where capacitive coupling can lead to issues like electronic oscillation.
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Capacitive coupling
Electrical coupling is the coupling of cells by gap junctions or electrical synapses, allowing electrical current and small molecules to pass from one to the other. Capacitive coupling, also known as electrostatic or AC coupling, is a type of electrical coupling that involves the transfer of alternating electrical signals or energy between segments of a circuit using a capacitor. This capacitor is connected between the two circuits in series, allowing AC signals to pass through while blocking DC signals.
However, capacitive coupling can also introduce nonlinear distortion at low frequencies. This occurs when the signal's frequency is low relative to the RC cutoff frequency, causing voltages to develop across the capacitor. To mitigate this issue, capacitors with low voltage coefficients and larger values are chosen to ensure the cutoff frequency is significantly lower than the signal's frequency.
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Electromagnetic coupling
When current flows through an energised conductor, it produces an electromagnetic field at right angles to the conductor. The electromagnetic field surrounding the energised conductor is constantly expanding and contracting as the electric current changes direction. When the electromagnetic lines of force cut through another conductor, a voltage is induced in that conductor.
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Crosstalk
In integrated circuit design, crosstalk refers to a signal affecting another nearby signal. The coupling is usually capacitive and occurs between the nearest neighbours. However, other forms of coupling and effects on signals further away are sometimes important, especially in analogue designs.
In stereo audio reproduction, crosstalk can refer to signal leakage from one program channel to another, reducing channel separation and stereo imaging.
In reality, the only types of crosstalk are forward and backward crosstalk. However, there are other terms used to refer to where the crosstalk is measured (near-end and far-end crosstalk, or NEXT and FEXT), how crosstalk is quantified (power-sum measurements), or the crosstalk source (AXT). All crosstalk is induced through two mechanisms: inductive and capacitive coupling. Capacitive coupling occurs when transmission lines run side by side, and the magnetic component of the electromagnetic field dominates. Inductive coupling, or magnetic field crosstalk, can also occur in PCBs.
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Conductive coupling
In the context of electronics, conductive coupling is a method of interconnecting two circuits. In addition to transferring the AC signal or information, the first circuit also provides DC bias to the second. This means that DC blocking capacitors are not required to interconnect the circuits. Conductive coupling allows for the transfer of the full spectrum of frequencies, including direct current.
An example of conductive coupling is when two electrical wires touch or are linked by a metal connection. This can result in unwanted electrical signals causing interference. This phenomenon is known as capacitive coupling, where an invisible electric force field from one wire induces electricity in another wire separated by a non-conductive material like air or plastic.
Direct coupling is commonly employed in systems dealing with significant amounts of electricity, such as power grids and motor control systems. It is also used in circuits like IC op-amps, where large coupling capacitors cannot be fabricated on-chip. One advantage of direct coupling is its excellent low-frequency response, ranging from DC to the highest operating frequency the system can handle.
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Frequently asked questions
Electrical coupling is the transfer of energy from one circuit to another through an electric field.
Electrical coupling occurs when the impedance of the source circuit is high. This results in the creation of electric field lines that start on one signal wire and end on another.
Electrical coupling is calculated by setting VS2 = 0 and determining the ratio VRL2/VRL1.
If you turn on the mixer in your kitchen, it may cause a disturbance on your television screen as they are connected to the same electrical line. This is an example of conductive coupling.
Electric coupling occurs between circuits, whereas electromagnetic coupling occurs between a source and a receiver, which are not necessarily part of a circuit.
