Technical
PCB related knowledge- The purpose of each layer of the PCB
How to do heat resistance testing for PCB board
Detailed explanation of rigid-flex board and IC carrier board
PCBA prototype procedure
Defects which can be detected by the SPI
What are the spacing requirements for designing PCB circuit boards?
What are the classification and advantages of PCB metal substrates?
Difference between the processing technology of 1Layer AL PCB and 2Layer AL PCB
Introduction of FPC Cable and its usage
advantages of Shenzhen SMT assembly factory
inspection items before PCB ordering
usages of ceramic substrates
main applications of PCB boards
Cost-effective PCB product services
How to check short circuit of a circuit board during manual soldering
Identify the polarity of electronic components during PCBA processing
Means Which Can Prevent Component Shifting in SMT Processing
Skills of PCB prototype manual soldering
Reasons for the shift of Components in the SMT Process
Seven Types of PCB Probes
What Should Be Paid Attention to in Layout of High-frequency PCB
Precautions for PCB CCL Selection
Advantages of LED Plant growth light
Advantages of using LED grow lights to grow industrial hemp
Detailed explanation of PCB manufacturing process and precautions
Detailed explanation of PCB manufacturing process and precautions
How to draw multilayer PCB on Altium Designer
Three basic elements of interference and how to suppression them.
Decrease interference between digital circuit and analog circuit
SMT Component Placement Process Of Parts : Manual Placement
SMT factory incoming PCB material inspection
Basic concepts commonly used in PCB design
Ideas and principles of High speed PCB layout
Component layout rules and safety distance considerations
SMT assembly process quality specification
5 points in PCB layout
Professional interpretation of SMT
Advantages and disadvantages of different PCB surface treatment
Special process in PCB prototype
Why the via hole become open after component assembly
Keep the cost of the PCB as low as possible
what are the causes of PCB board heating radiation problem
Pad size and via diameter dimensions consideration in PCB prototyping
How to Judge the Acceptance of PCB Quality
Which Color Circuit Board Sells the Most Expensive
Method to Solve the Noise Interference of Power Supply on High-frequency PCB Board
Disassembly Skills of Chip Components on PCB
What Factors Should Be Considered in the Selection of High-frequency PCB CCL
How to Place Special Components during PCB Layout
What Are the Functions of Capacitors in Circuits?
Testing Techniques for Common Electronics Components
What to do if There is a Short Circuit on the PCB
Desoldering Principles and knowhow during PCBA Processing
Black Oxidation of the Inner Layer of the Multilayer PCB
How to Ensure the High-performance Design of PCB
What Is the Printing Process of SMT Solder Paste?
PCB without fiducial mark, Is There Any Way to do SMT for It
What Are the Benefits of Reserving Break-up Tab for PCB Production
How Does SMT Affect PCB Production Time and Speed It Up
Classification of PCBs from three aspects
Common Problems and Solutions for Dry Film pasting during PCB Manufacturing process
Several Elements to Inspect after PCB Design
What is a halogen-free circuit board?
What Do Capacitive Coupling and Decoupling Mean?
What Are the Differences Between PCB Paste Mask and Solder Mask?
How PCBA Is Packaged and Shipped
How long can PCBA finished products be stored?
What Are the Differences and Relations Between PCB, PCBA, and SMT?
PCB Baking Specifications
PCB "Solder Mask Tenting" and "Solder Mask Opening"
Five reasons for PCB deformation and six solutions
Importance of first article inspection of PCBA board
Temperature zone standard for SMT reflow soldering
Small and medium volume PCB manufacturers in China
The main reason for PCBA cleaning
For power filter, the more capacitors, the better?
What does PCBA programming mean?
Content of PCB incoming testing
What conditions must be met for PCB circuit board soldering?
What is Blind via and Buried via
PCBA Manufacturers Temperature and Humidity Sensitive Components Management
Why choose Shenzhen SMT processing factory?
How long does it take to calculate the quotation for PCBA manufacturing?
Introduction of PCB design clearance requirements
Explanation of BOM, DIP, SMT, SMD
Introduction of the process of PCBA prototype
How to prevent pseudo soldering or cold soldering defects in PCBA manufacturing?

Why do we need to introduce so many subdivided GND

Engineers may ask, how can there be so many distinctions between grounds, and how can a simple circuit problem be so complicated?

Why do we need to introduce so many subdivided GND functions?

Generally regarding this type of GND design problem, Engineers simply named GND uniformly, and did not distinguish it during the schematic design process, which makes it difficult to effectively identify the GND ground of different circuit functions when PCB layout, directly and simply Connect all GND ground s together.

Although this operation is simple, it will lead to a series of problems:

1. Signal crosstalk
If the GND of different functions are directly connected together, the high-power circuit passes through the GND, which will affect the 0V reference point GND of the low-power circuit, thus causing crosstalk between signals of different circuits.

2. Signal accuracy
For analog circuits, the core indicator of its assessment is the accuracy of the signal. Without accuracy, the analog circuit loses its original functional significance.

Since the ground line CGND of the AC power supply is a sine wave, it fluctuates periodically, and its voltage also fluctuates up and down. It is not always maintained at 0V like the DC ground line GND.

Connect the GND of different circuits together. The periodically changing AC ground CGND will drive the AGND of the analog circuit to change, which affects the voltage accuracy value of the analog signal.

3. EMC experiment
The weaker the signal, the weaker the external electromagnetic radiation EMC; the stronger the signal, the stronger the external electromagnetic radiation EMC.
If the GND of different circuits are connected together, the GND of the strong signal circuit directly interferes with the GND of the weak signal circuit. The consequence is that the electromagnetic radiation EMC, which was originally a weak signal, has also become a signal source of strong external electromagnetic radiation, which increases the difficulty of the circuit pass EMC experiments.

4. Circuit reliability
Between the circuit systems, the fewer signal connections, the stronger the circuit's ability to operate independently; the more signal connections, the weaker the circuit's ability to operate independently.

Just imagine, if there is no intersection between the two circuit systems A and B, the function of the circuit system A obviously cannot affect the normal operation of the circuit system B, and the function of the circuit system B also cannot affect the circuit system A.

This is like a couple of unfamiliar men and women. Before they become lovers, the girl's mood changes will not affect the boy's mood, because they do not have any intersection.

If in the circuit system, the circuit ground of different functions are connected together, it is equivalent to increasing a link of interference between the circuits, that is, reducing the reliability of circuit operation.