What is a four-layer PCB? The main advantages of a four-layer PCB
2024-01-16
With the increasing demand for advanced technology, high-speed, high-performance, and miniature devices, the demand for complex and small printed circuit boards (PCBs) is also growing. As a result, PCBs have become smaller than ever before, available in a variety of configurations, and can be customized to meet application requirements. As a result, various multilayer PCBs are being developed. Among them, 4-layer PCBs are commonly used in a variety of applications. These PCBs are a key part of various electronic devices as well as communication equipment. Do you want to know more about them, especially stacking structures and their types, what benefits do they offer, and what are their areas of application?
What is a Quad Layer PCB?
Of all the multilayer types, the most common is a 4-layer printed circuit board (PCB). The stacking of the 4-layer PCB is very strong, it includes the top layer, the inner layer 1, the inner layer 2 and the bottom layer for routing electrical signals. The two inner layers (Inner Layers 1 and 2) are located between the top and bottom layers. Therefore, a four-layer PCB means 2 signal layers + a positive voltage layer (VCC layer) + a ground plane (GND layer) or 3 signal layers + GND layers. In a 4-layer PCB design, more surface area is available for routing. As a result, this design structure provides excellent routing for both low- and high-speed signals.
Four-layer PCB stacking type
When you contact a 4-layer PCB manufacturer, they will provide you with these two standard structures of a 4-layer PCB. The VCC and GND layers here are organized according to the application requirements.
Type 1: Signal – GND – VCC – Signal: In this 4-layer PCB design, the top layer is preferably the key signal. In terms of layer thickness, the impedance control core board should not be too thick. This helps to reduce the distribution impedance of the ground plane and the power supply.
Type 2: GND – Signal – Signal – GND: This stacking structure is ideal if you don't want to connect all types of ground pins using a through-hole path. To improve the EMC performance of the board, it is a good idea to always place the signal layer close to the plane. A large core between the ground plane and the power plane is utilized to maintain the overall thickness of the substrate.
The main advantages of a four-layer PCB
Due to their beneficial properties, four-layer PCBs are widely used in many electronic applications. Some of the main advantages offered by these multilayer PCBs are as follows:
* Smaller Mass Driven Design: This is one of the big reasons to use a 4-layer PCB. Due to their multi-layer design structure, they are inherently smaller than single-sided printed circuit boards. This is beneficial for modern electronic devices such as smartphones, tablets, and laptops. Since it is a multi-layer design, a thoroughly planned design and precision are required when installing components. This helps to reduce unnecessary errors and ensure high-quality results.
* Excellent Durability: As mentioned above, these boards can withstand not only the weight but also the pressure and heat applied, thus bonding them together. In addition, their durability increases due to the multi-layer insulation between the circuit layers.
* Higher Packing Density: These printed circuit boards increase assembly density by combining multiple layers onto a single board. The interconnect between the proximal regions makes the connection between the boards tighter.
* Lightweight construction: In a 4-layer PCB, multiple connectors are required to interconnect or connect separate single-layer and double-layer boards. It helps to simplify circuit design and reduce its weight.
Application of Four-Layer PCB
The key benefits of these boards contribute to their popularity in a variety of industries. Here are some of the important applications where these boards are widely used:
* Cardiac monitor
* Computer
* GPS technology
* File servers
* Cell phone
* Data Storage
* Signal transmission
* Weather analysis
* Space probe equipment
* X-ray equipment
* Atomic accelerators
* Cat scanning technology
* Fiber optic receivers
* Central fire alarm system
* Mobile phone transmission and repeater
* Computer
* GPS technology
* File servers
* Cell phone
* Data Storage
* Signal transmission
* Weather analysis
* Space probe equipment
* X-ray equipment
* Atomic accelerators
* Cat scanning technology
* Fiber optic receivers
* Central fire alarm system
* Mobile phone transmission and repeater
How to ensure the quality of PCB copy board
From what aspects to judge the quality of the PCB board?
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