Buried Resistance, 14 Layers PCB.

Embedded Resitors PCB

Improve resistance accuracy in high frequency and high speed applications. Although the resistance accuracy of discrete resistors is usually 1%, in actual circuit mutual mains, there will be parasitic inductances in the resistor package itself and PCB vias and pads. For example, when a 50 ohm resistor in a 0402 package is mounted on a PCB, the associated parasitic inductance is typically 6nH. If the resistor works at a frequency of 2GHz, its parasitic inductance is as high as 49 ohms. It far exceeds the 1% tolerance of the resistor itself. However, the parasitic inductance of the buried resistor itself is extremely less. When interconnecting with the actual circuit, no pads and vias are required, which greatly reduces the parasitic inductance. Therefore, although the precision of the manufactured buried resistance is only 10%, its actual precision is much higher than that of discrete resistors in high-frequency and high-speed applications.At present, the application of buried resistance technology is mainly in two ways:

(1) Plane subtraction method: directly press the bought resistance copper foil on the PCB, and process the resistance through the etching method. It is mainly used for the design of the resistance range of 50~100000m, and the resistance tolerance can be controlled at +/-15%, it is also mature and most widely applied technology at present. The main representative material is Ohmga, and the thickness of Trece is only about 0.2um.

(2) Plane addition method: Print the purchased resistance ink directly on the surface of the PCB, which is mainly used to replace the surface resistor of the circuit board. The resistance range is between 300~100kohm, and the resistance tolerance range is currently roughly controlled at +/- Between 20%, it has a wide range of uses.

Fuwwa has the ability to produce buried resitance PCB for customers and make sure the resitance tolerance with the customer's requirements. If you want to find a manufacturer in china to produce the embedded resistors for you, please select Fuwwa as your suppliers.

Company overview

    Shanghai Fuwwa Industrial Co., Ltd. is a high-tech enterprise specializing in the production of double-layer, multi-layer, high-rise, HDI, high-frequency, high-speed, and flexible circuit boards. We have advanced equipments and experienced engineers to provide the best quality service for customers in the fields of military, communications, medical, aerospace, aviation and consumer electronics, saving customers Development time and funds. We have a complete industrial chain and a strict quality management system.  

    Fuwwa carefully selected raw material suppliers from dozens of first-class raw material suppliers domestically  and overseas,  and has signed  long-term supply agreements, which ensures that we have large quantities of the best quality raw materials on a timely basis, and it is also a fundamental guarantee of the quality of our company's products.We have established a long-term and stable cooperative relationship with Rogers, Hitachi, Matsushita, ITEQ, SYL, Nelco, ISOLA, Taconic, Arlon, Stablcor etc.

    Fuwwa have built high-standard modern factories and have  hired managers and technicians with first-class work experience in domestic and foreign companies, so as to ensure that our products have our own technical advantages and market competitiveness. Good products allow us to obtain a large number of customers in domestic and overseas markets, and these high-quality customers are our company's valuable resources. Excellent customer groups give us information feedback while improving the function and quality of our products.

The quality control department has been established since the beginning  of the company. We have invested a huge amount of money to ensure the quality of products, which is the basis for our long-term foothold in the market.   The factory manages and controls the whole process  from raw materials into the factory, production and processing to finished products, and each process follows  scientific norms in order for continuous  improvement.

Our mission is to be recognized as a premier supplier to the markets we serve by providing quality PCB, HDI, Rigid-Flex PCB and High-frequency PCB CCL(Copper Coated Lamilates) meterials products to satisfy the needs of our customers. Our mission will be accomplished through excellence in customer service, sales and manufacturing,  and supported by teamwork of all associates. We will continue our tradition of honesty, fairness and integrity in the relationships with our customers, associates, community and stakeholders.