Bagaimana Reka Bentuk Analog PCB Pengilang PCB Perakitan China?

Panduan yang sangat mudah untuk memahami pelbagai jenis papan litar bercetak analog

Jadual kandungan:
1-Pengenalan kepada Pemasangan Pcb China
2-Komponen penempatan
3-Penerangan ringkas mengenai Jenis Penguat
Pcb Pemasangan 4-Pcb china Penguat frekuensi tinggi
5-Apakah peraturan asas untuk merancang PCB analog?
6-Apa masalah yang dihadapi oleh pcb pemasangan pcb dalam merancang PCB digital?
7-arahan untuk litar PCB frekuensi tinggi

 

Introduction to Pcb Assembly China

company  are manufacturing analog circuit signals for more than 60 % of electric devices.  A PCB is a crucial part of any electronic gadget for tiny devices or complex computers. Its complex interconnect components include resistors, diodes, capacitors, etc., enabling the devices to work in series. generally, a printed circuit board works as a soul of any electrical component. it is very importantly, so the PCB assembly process should be error-free and requires attention to common mistakes in assembly making process. Here are some factors to note:

Pcb Assembly China Basis rules for designing

There are three basic thoughts for designing rules.

1. Component placement
2. Signal conductor
3. Supply and ground line conductors

Component placement

In analog circuit design, component placement has significant role.

Following are the pcb component placement guideline:

• Front panel components should have proper alignment.
• Internal components must have a board edge placement
• Metal case components should be far from internal components.
• Heat sensitive and heat-producing components should not have side by side placement. Therefore proper planning must be there for the arrangement of both. The heat-producing components should be arranged all over the board evenly to avoid overheating and the heat-sensitive components must be placed with appropriate space from them.
• Similarly, mounting screws, it is necessary to have proper space between nuts and washer and there must not be any conductive track beneath this.

Signal conductor instructions for Pcb Assembly China

Reference level, feedback, input, output, etc. are some important tasks for pcb assembly china. Moreover, the signal conductor has to be short as possible for all analog circuit design. The signal conductor for the following circuits should have an adequate formation.

Circuits

1. High gain DC Amplifier
2. Differential Amplifier
3. Low-level signal Amplifier
4. High-frequency Amplifier
5. Multi-stage Amplifier

Brief description of Pcb Amplifier Types

1. High gain DC Amplifier

Generally, Pcb assembly china uses this device to amplify low-level signals. You can easily form a thermocouple junction between lead and copper. This thermocouple junction forms different voltages which cause noise signals. A pcb manufacturer should place the input stage in a separate edge to keep the temperature stable.

2. Differential Amplifier

The Differential Amplifier is important as it moves between tow signals and dismisses the common voltage. If the differential amplifier or reka bentuk PCB is not proper and the level of the signal is low then the common voltage creates a small difference signal. The geometrical symmetry while designing the amplifier must be correct otherwise the unbalanced impedance can disturb the performance of the circuit. Similarly, the leakage resistance creates unbalance voltage. Moreover, the guard conductor connects the signal conductor to the guard of the equipment. This method helps in handling differential signals at a low level. Furthermore, the glass epoxy base for differential amplifier helps in minimizing the leakage problem.

Pcb Assembly china High-frequency Amplifier

Susun atur PCB yang tidak tepat hasil susun atur frekuensi tinggi mengurangkan lebar jalur penguat. Kedekatan tanah dan konduktor isyarat menghasilkan kapasitansi tinggi, yang bertindak sebagai penapis lulus penapis rendah, yang mengurangkan lebar jalur penguat. Lebih-lebih lagi, kedekatan output dan input konduktor menghasilkan getaran. Menurut pengeluar cina pemasangan pcb terkemuka, frekuensi melebihi 10 MHz akan menyebabkan getaran. Tetapi penguat tidak akan berayun apabila frekuensi yang diinginkan diberikan. Gandingan kapasitif antara garis isyarat menyebabkan masalah seperti itu. Oleh itu, gandingan kapasitif seharusnya kurang semasa membuat reka bentuk PCB.

Konduktor Bekalan dan Tanah

The power supply must have enough thickness to keep the resistance and inductance low. But the conductance is directly proportional to thickness or width. If analog and digital circuits are on the same PCB then they must have their own separate ground conductors. For reference voltage circuits, the supply lines must attach to input and the ground line must attach to the stable ground reference.  Subsequently, stable ground reference is sensitive to the changes in ground potential. Simultaneously, the ground conductors have resistance, inductance, the doubtful current which causes voltage drops when passes from the ground impedance.

 What are the basic rules for designing analog PCB?

Pcb assembly china states general rules for designing analog PCB circuit areas;

• To control the voltage drop through conductors and electromagnetic interference keep the signal paths short.
• Similarly, the analog and digital grounds on the same board should be placed separately.
• Connect the signal ground to the earth ground.
• Give a return path to the noise source by connecting the capacitive shields.
• The material of the magnetic shields should be highly permeable
• Furthermore, the metal used on the circuits have a proper arrangement and must not be moving
• the system should be stable so the common-mode signals will not distinct
• The bandwidth of the system should be according to the signal bandwidth requirement.
• Make the path of the loops according to the passage of current.
• Above all to control or upgrade the noise rejection between two PCB, use a pair of cable and twist them along.

Apa masalah yang dihadapi oleh pcb pemasangan cina dalam merancang PCB digital?

Permintaan PCB dalam litar digital sangat disebabkan oleh prestasinya tetapi pengetahuan mengenai talian penghantaran elektronik juga penting.

Sekiranya reka bentuk PCB digital tidak betul, ia boleh menyebabkan masalah berikut bagi pemasangan pcb seperti

• Tukarkan satu nadi menjadi dua atau lebih (double pulsing) yang dikenali sebagai Refleksi.
• Menghasilkan isyarat kelewatan
• Ganggu isyarat yang dikenali sebagai Cross-talk.
• Boleh menghasilkan bunyi isyarat tanah dan bekalan
• Punca gangguan elektromagnetik.

Apakah panduan untuk pengeluar china pemasangan pcb untuk reka bentuk litar PCB frekuensi tinggi?

Berikut adalah arahan untuk litar PCB frekuensi tinggi

• Untuk konduktor tanah, pengeluar cina pemasangan pcb menggunakan permukaan tanah yang besar
• The wide power supply conductors are used
• Furthermore, ground and power supply lines must be parallel and close to each other
• The ground and power supply must have a decoupling capacitor in between
• The length of the conductor for a fast pulse should be kept small because the dielectric loss is directly proportional to length.
• Moreover, the dielectric loss is very important in the PCB however a PCB with proper high-frequency dimension should be used
• Designing the layout of the conductor is according to the capacitor and inductor. The more harmful element must not be used
• The lines should be kept small or the increase in the rise time must be as high as 1 sec/cm
• Prepare ground line via capacitor even the parasitic capacitance has a worse result.