Application of 0 Resistance

Single point grounding in analog and digital locations
As long as it is the land, it will eventually be connected together and then enter the Earth. If it is not connected together, it is "floating", there is a pressure difference, it is easy to accumulate the charge, resulting in static electricity. The ground refers to the 0 potential, and all voltages are obtained from the reference ground. The ground standards must be consistent, so all kinds of ground should be transient together. People think that the earth can absorb all the charge and always maintain stability, which is the final reference point. Although some boards are not connected to the earth, power plants are connected to the earth, and the power supply on the boards will eventually return to the power plant. If the simulated area is directly connected to the digital area, mutual interference will occur. There are four ways to solve this problem: 1. Connect with magnetic beads; 2. Connect with capacitors; 3. Connect with inductor; 4. Connect with a 0 ohm resistor.
The equivalent circuit of a magnetic bead is equivalent to a band-resistance wave limiting device, which only significantly blocks noise at a certain frequency point. It is necessary to estimate the noise frequency in advance so as to select an appropriate model. Magnetic beads do not match when the frequency is uncertain or unpredictable.
The capacitor is separated directly, causing float.
The inductance is large in size and has many stray parameters, which is unstable.
0 euro resistance is equivalent to a very narrow current path, which can effectively limit the Loop Current and suppress noise. Resistance degrades in all frequencies (0 euro resistance also has impedance), which is stronger than magnetic beads.
Used for current circuit during cross-connection
When the electrical ground plane is split, the shortest reflux path of the signal is broken. At this time, the signal loop has to bypass to form a large loop area, and the influence of the electric field and the magnetic field becomes stronger, easy to interfere with/be disturbed. The split zone is connected with 0 euro resistance, which can provide a shorter reflux path to reduce interference.
Configuration Circuit
Generally, do not enable jumper and dial switch on the product. Sometimes users may tamper with the settings, which may cause misunderstanding. In order to reduce maintenance costs, use 0 euro resistance instead of jumper and other welding on the board.
A vacant jumper is equivalent to an antenna at a high frequency. It works well with SMD resistors.
Other Purposes
Cross-line during cabling
Debugging/Testing
Temporarily replace other SMD Devices
As a temperature compensator
More often, it is out of EMC's need for countermeasures. In addition, the 0 ohm resistance is smaller than the parasitic inductance of the passing hole, and the passing hole will also affect the ground plane (because the hole needs to be dug ).
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The large 0-euro resistor can also be used as a jumper and can be laid in the middle
In addition, the 0-euro resistance of different sizes is allowed to pass through different currents. Generally, 0603 of 1A and 0805 of 2a are used. Therefore, when different current sizes are used for reserved positions such as magnetic beads and inductors, the package is made based on the size of the magnetic beads and inductance, so 0603, 0805, and other different sizes are available.
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0 ohm resistance is generally used in a hybrid signal circuit. In this circuit, in order to reduce the mutual interference between the numerical and analog parts, their power supplies are laid separately, however, the power supply entry points need to be connected together. Generally, the power supply is connected through a 0 ohm resistor, so that there is no electric pressure difference between the numerical ground and the simulated ground, the Parasitic Inductor with 0 ohm resistance is used to filter the interference of the numerical part on the analog part.