The Use of 0 ohm Resistor
Tags: resistor
Published: 2022-12-07 05:56:51

1. The definition of 0 ohm resistance
The 0 ohm resistor is called a jumper resistor. Its resistance value is not 0, but an ideal resistor whose actual resistance is very close to 0 ohm. We usually use 0 ohm chip resistors most often in the PCB design process.
Second, the use of 0 ohm resistors
The 0 ohm resistor plays a very small role in the circuit, it is only used on the PCB for debugging convenience or compatible design; and its use is more for use as a wire in our PCB design, of course its use is far more than Therefore, the following will explain in detail the various uses of 0 ohm resistors:
1. The 0 ohm resistor can be used as a jumper in PCB design. It reduces the difficulty of wiring, is beautiful and easy to install. On the premise of becoming an antenna, it can avoid high-frequency interference caused by jumping pins.
2. Reserve a place for debugging. When the parameters of the matching circuit are uncertain, we always replace them with 0 ohm resistors. When the actual debugging is performed, after the relevant parameters are determined, we replace them with components of specific values.
3. The role of measuring circuit power consumption. The 0 ohm resistor is actually a resistor with a small resistance value. If you need to measure the current consumption of a certain part of the circuit, you can connect a 0 ohm resistor and then an ammeter, which is convenient for measuring current consumption and can also be used to measure large currents. .
4. In high frequency signal, it can be used as inductor or capacitor. For example, when encountering EMC problems and related to external circuit characteristics, a 0-ohm resistor can be used as an inductor, just like between ground and ground, power supply and IC Pin.
5. The role of single-point grounding. It mainly means that the protective grounding, working grounding, and DC grounding are separated from each other on the equipment, and each becomes an independent system.
6. Act as a fuse for circuit protection. Due to the large fusing current of the traces on the PCB, if a fault such as short circuit and overcurrent occurs, it will be difficult to fuse, which may cause a greater accident. Since the current bearing capacity of the 0 ohm resistor is relatively weak (in fact, the 0 ohm resistor also has a certain resistance, but it is very small), the 0 ohm resistor is first fused when the current is over, thereby disconnecting the circuit and preventing a greater accident happened.
7. For use in mixed circuits such as digital and analog, it is necessary to separate the two grounds and connect them at a single point. First of all, we can use a 0 ohm resistor to connect the two grounds instead of directly connecting them together, thereby dividing the ground plane into digital ground and analog ground; secondly, the advantage of doing this is that the ground wire is divided into two A network, it will be much more convenient when laying copper on a large area. If they are connected together, it will be "floating", and there will be a voltage difference, which will easily accumulate charges and form static electricity, which will cause circuit failure. The ground is referenced to 0 potential, and all voltages are obtained with reference to the ground. The ground standards must be consistent, so the various grounds should be shorted together. However, in more occasions, inductors or magnetic beads are sometimes used for connection, which only have a significant effect on suppressing noise at a certain frequency point.