Before PCB circuit boards appeared, interconnections between electronic components were made by direct wires. Now the PCB circuit board is playing an important role in the electronics industry. Next, let's talk about the requirements of
PCB multi-layer PCB, and the difference between PCB and FPC.
The 1 power plane should be close to the ground plane, tightly coupled to the ground plane, and arranged below the ground plane.
3 isolate digital circuits from circuits. If conditions permit, signal lines and digital signal lines will be layering and shielded.
The 2 signal layer should be adjacent to the inner layer and should not be directly adjacent to the other signal layers.
If the same signal layer is needed, isolation bands and ground lines are needed to reduce interference; the power and ground of and digital circuits should be isolated from each other and not be mixed.
4. High-frequency circuit has large external interference, it is better to arrange separately, and use the middle signallayerwhichhasthe inner layer directly adjacent to each other to transmit.
It is easy to reduce the external interference by using copper film inside the electric layer.Requirements for PCB multilayer board
(1) The power supply plane should be close to the ground plane, closely combined with the ground plane, and arranged under the ground plane.
(3) digital circuits and circuits are isolated. If conditions permit, layers of and digital signal lines are clearly arranged and shielded; if the same signal layer is required, isolation bands and ground lines are needed to reduce interference; the power supply and ground of and digital circuits should be isolated from each other and not be used together.
(2) the signal layer should be adjacent to the inner layer and should not be directly adjacent to the other signal layers.
(4) External interference is greater, it is better to arrange independently, using the upper and lower inner layer directly adjacent to the middle signal layer to transmit, so as to use the copper film of the inner layer to reduce external interference.
What is the difference between PCB and FPC?
FPC is short for Flexible Printed Circuit, also known as flexible circuit board, flexible printed circuit board, flexible circuit board, short for flexible circuit board or FPC, with high wiring density, light weight, thin thickness characteristics. Mainly used in mobile phones, notebook computers, PDA, digital cameras, LCM and many other products. FPC flexible printed circuit is polyamide. A flexible printed circuit with high reliability and excellent flexibility made of imide or polyester film as substrate.
PCB (Printed Circuit Board), Chinese name for printed circuit board, also known as printed circuit board, printed circuit board, is an important electronic component, is the support of electronic components, electronic components are connected to the provider of electrical components. Because it is made by electronic printing, it is called "printed" circuit board.
Product characteristics:
1. it can be freely bent, folded and wound, and it can move and expand freely in 3D space.
3. realize lightweight, miniaturization and thinning, so as to achieve the integration of components and wires.
2. good heat dissipation, F-PC can be used to reduce the volume.
Broadly speaking, PCB includes FPC.
First, the physical characteristics are different. FPC is a flexible circuit board. As the name suggests, it can be bent. PCB on steel circuit boards. It can't be bent.
Three is the use of different. For many products with very strict structural design, PCB can not meet the assembly requirements, and FPC must be used instead. For example, thickness requirements and bending requirements.
Two is the use of different materials. FPC and basic materials are not shared. Each has its own materials. Of course, some of the materials can be shared. For example, ink. Written words.
