.

one-stop service Regular PCB Assembly,PCB Assemblypreferred

Shenzhen Jie Du State Technology Co., Ltd.is a company with turnkey pcb assembly,PCB Assemblyandturnkey PCB assemblyx19b6516n as the main business. We are committed to providing quality service of Low volume PCB assembly. Shenzhen Jie Du State Technology Co., Ltd.was established in 10 years ago, As a company with a high sense of social responsibility, Jieduo state technologyhas established a high reputation for superior quality and expertise in PCB SMTfield

Shenzhen Jie Du State Technology Co., Ltd. adhere to the continuous technical innovation , continue to create PCBGOGO value for our customers.Jieduo state technology have branches in,,, and other cities , and all staff focus on The hottest PCB SMT industry innovation and development;and we rely on the growing of Famous PCB Online innovative practice ability to win the majority of customers trust and cooperation. details:
PCB Assembly Manufacturer

Printed circuit board design is based on the circuit schematic, to achieve the circuit designer needs. Printed circuit board design mainly refers to the layout design, need to consider the layout of external connections. Optimization of internal electronic components. Optimized layout of metal connections and vias. Electromagnetic protection. Heat dissipation and other factors. Excellent layout design can save production costs, achieve good circuit performance and thermal performance. Simple layout design can be done manually, and complex layout designs need to be implemented with computer aided design (CAD).

In high-speed designs, the characteristic impedance of the controllable resistors and lines is one of the most important and common problems. First, look at the definition of the transmission line: the transmission line consists of two conductors with a certain length, one conductor used to send the signal, the other used to receive the signal (remember "loop" to replace the "ground" concept). In a multilayer board, each line is part of the transmission line, and the adjacent reference plane can be used as a second line or loop. The key to becoming a "good performance" transmission line is to keep its characteristic impedance constant throughout the line. [1]

The key to making the board a "controllable impedance plate" is to make the characteristic impedance of all lines meet a specified value, usually between 25 ohms and 70 ohms. In multilayer circuit boards, the key to good transmission line performance is to keep its characteristic impedance constant across the entire line.

But what exactly is the characteristic impedance? The easiest way to understand the characteristic impedance is to see what the signal is in the transmission. This is similar to the microwave transmission shown in Figure 1 when moving along a transmission line with the same cross-section. Assuming that a 1 volt voltage step wave is applied to this transmission line, such as a 1 volt battery connected to the front end of the transmission line (which is located between the transmission line and the circuit), once connected, the voltage wave signal along the line to the speed of light Spread, its speed is usually about 6 inches / nanosecond. Of course, this signal is indeed the voltage difference between the transmission line and the loop, which can be measured from any point of the transmission line and the adjacent point of the loop. Figure 2 is a schematic representation of the transmission of the voltage signal.

Zen's method is to "generate a signal" and then spread along the transmission line at a speed of 6 inches / nanosecond. The first 0.01 nanosecond forward 0.06 inches, then send the line there are excess positive charge, and the circuit has excess negative charge, it is these two kinds of charge difference between the two conductors to maintain the voltage difference between 1 volt, And these two conductors and formed a capacitor.

In the next 0.01 nanoseconds, it is necessary to adjust the voltage of a 0.06-inch transmission line from 0 to 1 volt, which must add some positive charge to the transmission line and add some negative charge to the receiving line. For each move of 0.06 inches, more positive charge must be added to the sending line, and more negative charge is added to the loop. Every 0.01 nanoseconds, the other part of the transmission line must be charged, and then the signal begins to propagate along this segment. The battery from the front end of the transmission line, when moving along this line, charges the continuous portion of the transmission line so that a voltage difference of 1 volt is formed between the transmission line and the circuit. A constant charge (± Q) from the battery is given a constant current (± Q) for a constant time interval (± t). The negative current flowing into the circuit is actually equal to the positive current flowing out, and at the front end of the signal wave, the AC current flows through the upper and lower lines to complete the entire cycle.



With the rapid development of business simultaneously, Jieduo state technology always keeps the balance between external opportunities and internal management, attaching great importance to the training and shaping of core competitiveness. The company will take customer service value as the core competitiveness of enterprises. Adhering to spirit of enterprise:acting with integrity , pursuit of excellence, respect for the individual , Jieduo state technologystrives to provide customers with Reputable supply Custom PCB. More details in the Jieduo state technologyofficial website:



Send product request

To: 714424
Your E-mail:
Message text:


Send to other suppliers

Other supplier products

Guilin CityElectronic Componentis worthy of your trust
Guilin CityElectronic Componentis worthy of your trust Quick turn PCB assemblyandChina PCB prototypex19b6516nof Shenzhen Jie Du State Technology Co., Ltd.is favored by the majority of customers love...
custom PCB assembly,hot winner sale
custom PCB assembly,hot winner sale Shenzhen Jie Du State Technology Co., Ltd.is a company with Approved custom PCB assembly,PCB manufacturerandCustom PCB as the main business. We are...
one-stop service Low volume PCB assembly price,Low volume P
one-stop service Low volume PCB assembly price,Low volume P Shenzhen Jie Du State Technology Co., Ltd. is a electronic PCB assembly discountcompany in China, was founded in 2013-02-27, and named asShenzhen J...
Jieduo state technologyPCB Online, professional PCB Assembl
Jieduo state technologyPCB Online, professional PCB Assembl Shenzhen Jie Du State Technology Co., Ltd.located in Guangdong Province,Shenzhen City,Futian district,Futian Road, Futian District, Shenzhen, China...
PCB manufacturer choose 电子元器件, its Jieduo state techno
PCB manufacturer choose 电子元器件, its Jieduo state techno Shenzhen Jie Du State Technology Co., Ltd.located in Guangdong Province,Shenzhen City,Futian district,Futian Road, Futian District, Shenzhen, China...
All supplier products

Same products

Bhutan large diameter liquid nitrogen container KGSQ cryo vessels
Bhutan large diameter liquid nitrogen container KGSQ cryo vessels Seller: Henan Tianzhidao Biological Technology Co., Ltd Currently, the methods of cell preservation are refrigerator and liquid nitrogen. When it comes t...
OWON 4 1/2 XDM1041 Universal Digital Multimeter Portable Desktop Rechargeable
OWON 4 1/2 XDM1041 Universal Digital Multimeter Portable Desktop Rechargeable Seller: PHONEFIX Technology Co., Ltd. OWON 4 1/2 XDM1041 XDM1241 Universal Digital Multimeter Portable Bench Rechargeable 55000 Counts ...
Netherlands liquid nitrogen freezer KGSQ cryo vessels
Netherlands liquid nitrogen freezer KGSQ cryo vessels Seller: Henan Tianzhidao Biological Technology Co., Ltd. Currently, the methods of cell preservation are refrigerator and liquid nitrogen. When it comes t...
Pneumatic LCD Monitor Desk Mount
Pneumatic LCD Monitor Desk Mount Seller: Zhejiang Lingshang Industry & Trade Co., Ltd. The gas spring monitor mount can easily raise your monitors to optimal heights and thus effective...
Insulating gasket M10X30 Generator QFQS-200-2
Insulating gasket M10X30 Generator QFQS-200-2 Seller: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD "Insulating gasket M10X30 Generator QFQS-200-2 Steam turbine partsYoyik is specialized in manufac...