Function of the hottest 0 ohm resistor

The function of 0 ohm resistor

1 has no function in the circuit, but it is designed on PCB for convenience of debugging or compatibility. 

2, it can be used as a jumper. If a certain section of the line is not used, it is OK not to stick the resistance directly (without affecting the appearance)

3, when the parameters of the matching circuit are uncertain, replace it with 0 ohm. When actually debugging, determine the parameters, and then replace it with components with specific values

4, when you want to measure the current consumption of a certain part of the circuit, you can remove the 0ohm resistance and connect the ammeter, so it is convenient to measure the power consumption. This kind of plastic wood composite material is a kind of green environmental protection material flow that saves energy and protects the environment

5, when wiring, if you can't make it, you can also add a 0 ohm resistance

6, acts as inductance or capacitance under high-frequency signals. (related to external circuit characteristics) inductance is mainly used to solve EMC problems. Such as ground to ground, between power supply and IC pin

7, single point grounding (refers to that protective grounding, working grounding and DC grounding are separated from each other on the equipment and become independent systems respectively.)

8, fuse action

9, single point grounding. As long as it is grounded, it must be connected together and then into the earth. If they are not connected together, they are "floating", and there is a pressure difference, which is easy to accumulate charges and cause static electricity. The ground is the reference 0 potential, and all voltages are derived from the reference ground. The ground standard should be consistent, so all kinds of grounds should be shorted together. It is believed that the earth can absorb all charges and maintain stability all the time, which is the ultimate reference point of the earth. Although some boards are not grounded, the power plant is grounded, and the power supply on the board will eventually return to the power plant. If the analog ground and the digital ground are directly connected in a large area, it will cause mutual interference. It is neither short circuited nor appropriate. The reason is that there are four methods to load the sample; The force sensor is installed on the upper beam to solve this problem: 1. Connect with magnetic beads; 2. Connect with capacitance; 3. Connect with inductance; 4. Connect with 0 ohm resistance. In addition to Vertu and gresso1 manufacturers of magnetic beads, the equivalent circuit of titanium alloy shell is equivalent to a band stop wave limiter, which can only significantly suppress the noise at a certain frequency point. It is necessary to estimate the noise frequency in advance in order to select the appropriate model. For cases where the frequency is uncertain or unpredictable, the magnetic beads do not match

the equivalent circuit of magnetic beads is equivalent to a band stop wave limiter, which can only significantly suppress the noise at a certain frequency point. When using, it is necessary to estimate the noise frequency in advance in order to select the appropriate model. For cases where the frequency is uncertain or unpredictable, the magnetic beads do not match

the capacitor is isolated directly from the AC, resulting in floating ground

the inductance has large volume, many stray parameters and instability

0 ohm resistance is equivalent to a very narrow current path, which can effectively limit the loop current and suppress the noise. Resistance has attenuation effect in all frequency bands (0 ohm resistance also has impedance), which is stronger than magnetic beads

10. It is used for the current loop when bridging. When the electric ground plane is divided, the shortest return path of the signal is broken. At this time, the signal loop has to bypass, forming a large loop area, and the influence of the electric field and magnetic field becomes stronger, which is easy to interfere/be interfered. Bridging 0 ohm resistor on the divided area can provide a shorter return path and reduce interference

11, configure the circuit. Generally, there should be no jumper and dial switch on the product. Sometimes the user will tamper with the settings, which is easy to cause misunderstanding. In order to reduce the maintenance cost, 0 ohm resistance is used instead of jumper and welded on the board. The vacant jumper is equivalent to an antenna at high frequency, and the effect of using patch resistor is good

12, for other purposes, cross the line when wiring; For commissioning/testing; Temporarily replace other patch devices; As a temperature compensation device; More often, it is the need of EMC countermeasures. In addition, the 0 ohm resistance is smaller than the parasitic inductance of the via, and the via will also affect the ground level (because the hole needs to be dug). (end)