What does it mean that the signal is coupled and what is signal coupling

If you're talking about a power system, the carrier channel couples the signals in phase or phase to ground.

Phase-to-ground coupling: This coupling mode is to connect the carrier device between a phase wire and ground, and only need to install a coupling capacitor and a blocker at each coupling point, using less equipment, but its attenuation is larger than that of phase coupling. In the event of a ground fault in the coupling phase, the attenuation increases considerably.

It is important to note that although the coupling is connected on a one-to-one basis, the actual signal transmission, including the other two phases, takes place in a complex manner. Due to the economical phase-to-ground coupling, this method can be used in general cases where the carrier channel is not required to have high reliability when the first path fails.

Phase-phase coupling: This coupling method is to connect the carrier device between two phase wires, and one phase can be used to combine the device, or two phases to combine the device. In the case of a phase-bonded device, the distance between the low-voltage end of the coupling capacitor and the bonding device is generally larger than that of the two-phase bonding device, and the possibility of danger or interruption is also greater.

For safety reasons, two phase-to-ground coupling devices are usually coupled to each other, and the secondary of their matching variable is correctly connected. In this way, it is necessary to install two coupling capacitors and two chokes at the coupling point, and the cost of coupling equipment is high. But its advantages stand out; low attenuation; Line faults, especially single-phase ground faults, have small attenuation changes and high reliability; Less interference sent and less interference received, etc.

Since 80% of line faults are single-phase faults, this coupling method is of great significance in practical applications. There is also a coupling method that can be regarded as a special phase-phase coupling method, which is called line-to-line coupling. On the double-loop power line erected on the same pole, the phase coupling equivalent to the single-loop line can be formed by using the conductor of one phase in each circuit line, and the differential coupling form can also be formed by using the conductor of two phases in each circuit line.

In the latter coupling method, carrier communication is not interrupted even if the primary line is not powered and grounded.

In order to realize the transmission of energy and signals, the method of connecting each functional circuit is called a coupling circuit. In general, coupling circuits usually have one or more functions such as filtering, energy storage, isolation, and impedance transformation.

Coupling refers to the phenomenon that there is a close coordination and mutual influence between the input and output of two or more circuit elements or circuit networks, and the energy is transmitted from one side to the other through interaction. A coupling circuit is a circuit that participates in the coupling process.

In terms of circuits, it is always possible to distinguish between the source of the drive and the load being driven. If the load capacitance is relatively large, the driving circuit should charge and discharge the capacitor in order to complete the signal jump, when the rising edge is steeper, the current is relatively large, so that the driving current will absorb a large power supply current, due to the inductance in the circuit, resistance (especially the inductance on the chip pins, will produce **), this current is actually a kind of noise relative to the normal situation, which will affect the normal operation of the pre-amp, which is coupling.

The role of capacitive coupling.

Capacitive coupling is used to transmit an AC signal from the previous stage to the next. There are also direct coupling and transformer coupling methods. The direct coupling efficiency is the highest, and the signal is not distorted, but the adjustment of the front and rear two operating points is more complex and implicated in each other.

In order to make the working point of the latter stage not affected by the previous stage, it is necessary to separate the previous stage and the latter stage in the DC aspect, and at the same time, the AC signal can be smoothly transmitted from the previous stage to the latter stage, and the method that can complete this task is to use capacitor transmission or transformer transmission to achieve. They can transmit AC signals and block DC, so that the working points of the front and rear stages are not implicated in each other. However, the difference is that when transmitting with capacitors, the phase of the signal is delayed, and when transmitting with a transformer, the high-frequency component of the signal is lost.

In general, capacitors are commonly used as coupling elements for small signal transmission, and transformers are commonly used as coupling components for large signal or strong signal transmission.

The transmission mode used to transmit the signal from the previous stage to the next stage is called coupling, and the commonly used coupling methods in multistage amplifiers include resistor-capacitance coupling, transformer coupling, direct coupling and optoelectronic coupling.

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Coupling refers to the process by which energy travels from one medium to another. When two or more circuits form a network, if the current or voltage changes in one of the circuits, it can affect the other circuits to undergo similar changes, and this kind of network is called a coupling circuit. The function of coupling is to transfer (or convert) the energy of one circuit to other circuits.

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The transmission mode used to transmit the signal from the previous stage to the next stage is called signal coupling;

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Coupling refers to the phenomenon that there is a close coordination and mutual influence between the input and output of two or more circuit elements or electrical networks, and the energy is transmitted from one side to the other through interaction. A coupling circuit is a circuit that participates in the coupling process. Schematic diagram of the coupling circuit.

In terms of circuits, it is always possible to distinguish between the source of the drive and the load being driven. If the load capacitance is relatively large, the driving circuit should charge and discharge the capacitor in order to complete the signal jump, when the rising edge is steeper, the current is relatively large, so that the driving current will absorb a large power supply current, due to the inductance in the circuit, resistance (especially the inductance on the chip pins, will produce **), this current is actually a kind of noise relative to the normal situation, which will affect the normal operation of the pre-amp, which is coupling.

Coupling in electronic circuits generally refers to the transfer of a signal from the previous stage to the next. Sometimes it cannot be directly connected, for example, the DC level of the two-stage circuit is different, so capacitive coupling is required; If the input and output impedances do not match, impedance matching circuits are required, such as transformers. These circuits are called coupling circuits.

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Coupling in an electronic circuit refers to the phenomenon of close coordination and mutual influence between the input and output of two or more circuit elements or circuit networks, and the transmission of energy from one side to the other through interaction. A coupling circuit is a circuit that participates in the coupling process.

The coupling methods of multi-stage amplification circuits are:

Direct coupling, resistor-capacitance coupling, transformer coupling, and optoelectronic coupling.

1. Direct coupling: connect the output of the previous stage directly to the input of the next stage.

2. Resistor-capacitance coupling: connect the pre-output terminal of the amplification circuit to the post-output terminal through capacitors.

3. Transformer coupling: connect the output terminal of the pre-stage of the amplification circuit to the input terminal or load resistor of the post-stage through the transformer.

4. Photocoupler: It is the basic device to realize photoelectric coupling, which combines light-emitting elements (light-emitting diodes) and photosensitive elements (phototransistors) together in isolation from each other.

Coupling refers to the phenomenon that there is a close coordination and mutual influence between the input and output of two or more circuit elements or electrical networks, and the energy is transmitted from one side to the other through interaction. In a nutshell, coupling refers to a measure in which two or more entities depend on each other. It is divided into the following types:

Non-direct coupling: There is no direct relationship between the two modules, and the connection between them is entirely achieved through the control and invocation of the main module.

Data coupling: When one module accesses another, it exchanges input and output information with each other through simple data parameters (not control parameters, common data structures, or external variables).

Tag coupling: A set of modules pass record information through a parameter table, which is marker coupling. This record is a substructure of a data structure, not a simple variable. In fact, it is the address of this data structure that is passed;

Control coupling: If a module clearly controls the function of selecting another module by transmitting control information such as switches, logos, names, etc., it is control coupling.

External coupling: A set of modules that all access the same global simple variable instead of the same global data structure, and do not pass the information of that global variable through a parameter table, is called external coupling.

Common coupling: If a set of modules all access the same common data environment, the coupling between them is called public coupling. A common data environment can be a global data structure, a shared communication area, a common footprint for memory, and so on.

A coupling circuit is a capacitor that transmits a signal (certainly an AC signal) from one part of the circuit to another, and the coupling with capacitors is often done to isolate the DC signal. Interpole capacitance refers to the actual equivalent capacitance between the base, emitter, and collector of a transistor, etc., and this capacitance is not visible from the circuit, and it is an abstraction of the actual capacitance effect between the poles. Bypass capacitors are used to filter out AC signals (often noise or ripple) in DC circuits.

In summary: the coupling capacitor passes through a useful signal, the bypass capacitor passes through an unwanted signal, and the interpole capacitance is an abstraction of the actual capacitive effect.

The coupling control mechanism determines how the input signal passes from the BNC input on the front panel of the oscilloscope to the rest of the system for that channel to be vertically deflected. Coupling control can be set up in two ways, DC coupling and AC coupling.

The DC coupling method provides a direct connection path for the signal. As a result, the signal provides a direct connection path. Therefore, all components of the signal (AC and DC) affect the waveform display of the oscilloscope.

In the AC coupling mode, a capacitor is connected in series between the BNC terminal and the attenuator. In this way, the DC component of the signal is blocked, and the low-frequency AC component of the signal is also blocked or greatly attenuated. The low-frequency cut-off frequency of an oscilloscope is the frequency at which the oscilloscope displays a signal with an amplitude of only 71.

The low-frequency cutoff frequency of an oscilloscope is primarily determined by the value of its input coupling capacitance. The oscilloscope's low-frequency cut-off frequency is typically 10Hz.

Another function related to the coupling control mechanism is the input grounding function. At this point, the input signal is disconnected from the attenuator and the attenuator input is connected to the oscilloscope's ground level. When ground is selected, you will see a straight line at 0V level on the screen.

A position control mechanism can be used to adjust this reference level or the position of the scan baseline.

When AC coupling is selected, only the communication information of the waveform is displayed!! When DC coupling is selected, it is possible to display both the AC information of the waveform and the DC information!!

It is the type of input signal, which is divided into pure AC, pure DC and AC/DC hybrid.

Generally, there are three coupling modes: DC, AC, and grounding.

DC coupling is to directly input the signal to the next level of circuit, including the DC signal and AC signal of the signal.

AC coupling is to input only the AC component of the signal to the next level of circuit, and filter out the DC component.

Grounding coupling is to filter out the signal directly to ground.

The input coupling of an oscilloscope means how the input signal is transmitted.

Coupling refers to the phenomenon that there is close coordination and mutual influence between the input and output of two or more circuit elements or electrical networks, etc., and the energy is transmitted from one side to the other through interaction; The input coupling of the oscilloscope belongs to the direct coupling of the signal, and there are generally two ways, namely DC mode and AC mode, and there is generally grounding in gear selection.

The DC mode annotation is DC, and the DC part of the signal will be processed and displayed, and the corresponding display waveform is the full state of the signal;

The AC mode is marked as AC, and the DC part of the signal will not be displayed, and the corresponding display waveform is the AC part;

The grounding label is GND, which is actually to disconnect the input and ground the input, and the purpose is to eliminate interference and facilitate the zero point.

Coupling, in the field of electronics and telecommunications, refers to the process of energy propagation from one medium (e.g., a metal wire, optical fiber) to another.

In electronics, coupling refers to the transfer of energy from one part of a circuit to another.

With conductive coupling, energy is propagated from a voltage source to a load. Capacitors allow the AC and DC parts of a circuit to be coupled by allowing the AC component to pass through and block the DC component. The transformer can also act as a coupling medium, and a proper impedance match can be achieved by configuring the appropriate impedance at both ends.

You think of it this way: for example, if you think of a signal that has AC and DC components in it, when you choose AC coupling, only the AC signal can be displayed on the oscilloscope screen, and the DC signal is filtered out.

When you select the DC coupling method, both AC and DC signals are reflected on the oscilloscope screen!!