1. Why are there often large noise voltages on the ground and power lines of digital circuits? How to reduce these noise voltages?
When digital circuits work, they draw large currents instantaneously. When these transient currents flow through the power lines and ground lines, they will generate large recoil voltages due to the presence of power line and ground inductances. This is the observed noise. Voltage. One way to reduce these noise voltages is to reduce the inductance of the power and ground lines, such as the use of grid ground, ground plane, power plane, etc. Another method is to use appropriate decoupling capacitors on the power line (storage Capacitance).
2. In practice, it is common to twist multiple strands of wire as high-frequency conductors, which is said to reduce the RF impedance of the wire. Why?
This increases the surface area of ​​the wire, thereby reducing the high frequency resistance.
3, circuit or circuit board electromagnetic compatibility design should pay special attention to the processing of key signals, where the key signal refers to those signals?
From the perspective of electromagnetic emission, key signal lines refer to periodic signals, such as local oscillator signals, clock signals, and address low signals. From the perspective of sensitivity, key signals refer to signals that are sensitive to external electromagnetic interference, such as low power. Flat analog signal.
4. How to prevent the phenomenon of electrochemical corrosion at the overlap point?
Select a metal that has an electrochemical potential close to it, or make an environmentally sealed part of the contact and isolate the electrolyte.
5 , what is a lap, cited several overlapping methods.
Low-resistance (RF) connections between metal components are called lap joints, and lap joints include welding, riveting, screw connections, and electromagnetic seal gasket connections.
6. Please list as many ways as possible to reduce the RF impedance of the ground wire.
Try to use a conductor with a large surface area to reduce the resistance of the high-frequency current; try to make the conductor shorter to reduce the resistance and inductance; silver on the conductor surface to reduce the surface resistance; multiple conductors in parallel, reduce the inductance.
7. Why does some ground wire see some grounding through capacitors or inductors in some imported prototypes?
In order to make the ground system for different frequency signals present different ground structure.
8. What is the root cause of ground disturbance?
The impedance of the ground wire is the root cause of the ground wire problem. Due to the existence of the ground wire impedance, when the current flows through the local wire, a voltage is generated to form a potential difference. In designing the circuit, we assume the ground points. The potential is the same, the ground potential is the reference potential for the entire system operation, and the difference between the actual ground potential and the assumed conditions leads to a variety of ground problems.
9. What definition is used to describe the ground line when analyzing electromagnetic interference?
Ground is defined as the return line of the signal.
10. When there are many wires passing through the panel, filter connectors or filter array boards are often used. What should be noted when installing filter connectors or filter array boards?
Install an electromagnetic seal gasket between the filter connector or filter array board and the chassis panel or glue the gap with conductive tape to prevent electromagnetic leakage at the gap.
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