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Shenzhen Smart-core cloud Information Technology Co,. Ltd（abbr.SMCC), relying on rich industry experience and resources of the Group Smart-Core Holdings (02166.HK) in the field of electronic component distribution, focuses on the independent distribution business of electronic components and e-commerce business.Based on a strong channel network and supplier database, it provides customers with convenient supply chain services such as Large-Batch Spot Procurement、Long-Term Ordering and Emergency Materials Procurement. In order to provide customers with comprehensive protection, we have set up a experienceed QC team to ensure that customers receive 100% qualified goods. In order to completely eliminate the harm caused by fake and shoddy products, we also cooperate with well-known third-party inspection agency, which can conduct in-depth professional testing on all products. In addition, SMCC has passed ISO9001:2015 certification and has become a member of ERAI. SMCC has a comprehensive distribution network covering Hong Kong, Shenzhen, Beijing, Shanghai, Hangzhou, Chengdu, Wuhan, Xiamen, Taipei, Europe, Japan, Singapore, Vietnam, India, etc. Efficiently and accurately meet the spot demand of local customers.
  • What is FPGA field programmable gate array

    1-Field programmable gate array (FPGA) is the product of further development on the basis of programmable devices such as pal (programmable array logic) and gal (general array logic). As a semi custom circuit in the field of application specific integrated circuits (ASIC), it not only solves the shortcomings of custom circuits, but also overcomes the shortcomings of the limited number of programmable devices. The mainstream manufacturers of field programmable gate array FPGA chips include Xilinx, Altera, lattice and MICROSEMI, of which the first two have a total market share of 88%. Field programmable gate array FPGA is a semiconductor device composed of configurable logic block (CLB) matrix connected through programmable interconnection. FPGA can be reprogrammed according to the required application or functional requirements after manufacturing. This feature is the key to the difference between FPGA and ASIC. You can customize FPGA devices for specific design tasks. Although there are also one-time programmable (OTP) FPGAs on the market, most of them are based on SRAM and can be reprogrammed as the design evolves. Field programmable gate array FPGA has a very mature and wide range of applications in the aerospace, military, telecommunications fields. Taking the telecommunication field as an example, in the stage of all-in-one telecommunication equipment, FPGA is applied to network protocol parsing and interface conversion because of its programming flexibility and high performance. In the nfv scenario, FPGA based on the general server and hypervisor can achieve a 5-fold performance improvement of the network element data plane, and can be managed and arranged by the openstack cyborg hardware acceleration framework. In terms of chip design, we need to focus on rationality in algorithm design to ensure the final completion effect of the project, and put forward a solution to the problem according to the actual situation of the project, so as to improve the operation efficiency of FPGA. After the algorithm is determined, the module should be constructed reasonably to facilitate the later code design. In the code design, we can use the pre designed code to improve work efficiency and reliability. Write the test platform, carry out the code simulation test and board debugging, and complete the whole design process. Unlike ASIC, FPGA has a short development cycle. It can change the hardware structure in combination with the design requirements. When the communication protocol is immature, it can help enterprises quickly launch new products and meet the needs of non-standard interface development.

    2024-05-17 0

  • How to realize the frequency synchronization of crystal oscillator?

    2-  Crystal oscillators can help electronic systems provide frequencies for synchronous operation, as frequency references or to achieve accurate timing.   In microprocessor-based systems, there are several different frequency signals used to execute instructions, move data into and out of memory, and external communication interfaces.   A simple embedded controller may have a clock frequency of several MHz, while microprocessors in personal computers usually expect an input frequency of 15 MHz. This will multiply internally to provide the frequency of the CPU and other subsystems. Other components in the system may have their own frequency requirements.   In addition to providing the basic requirements of the specified frequency, the oscillator may have to meet other requirements depending on the application requirements of the product.   For example, many product applications require extremely precisely defined frequencies. This is particularly important for systems that need to communicate with other devices through serial or wireless interfaces. Accuracy is usually measured in parts per million (PPM).   At the same time, the trimming circuit can be based on resistance capacitance (RC) or inductance capacitance (LC) networks. These devices are relatively simple and can change the frequency in a wide range. However, designing an accurate RC oscillator or LC oscillator requires the use of expensive precise components. Even so, they cannot meet the highest accuracy and stability required by many product applications.   Crystal oscillators (usually quartz) can also be used as resonant components. Cut the crystal into two parallel crystal planes and deposit metal contacts on them. Quartz has piezoelectric effect, which means that when the crystal is placed under pressure, voltage will be generated on its crystal surface. On the contrary, when voltage is applied to the crystal, the crystal will also change its shape.

    1970-01-01 0

  • What are the applications of digital potentiometers?

    3-  Digital potentiometer, also known as numerical control device, is a new type of CMOS integrated circuit for mixed digital and analog signal processing. The digital potentiometer is controlled by digital input and generates analog output.   According to different digital potentiometers, the maximum tap current can range from hundreds of microamps to several milliamps. The digital potentiometer adopts numerical control to adjust the resistance value, which has the remarkable advantages of flexibility, high adjustment accuracy, no contact, low noise, not easy to damage, anti vibration, anti-interference, small size, long service life and so on. It can replace the mechanical potentiometer in many fields.   Potentiometer is an adjustable electronic component. It is composed of a resistor and a rotating or sliding system. When a voltage is applied between the two fixed contacts of the resistance body, the position of the contact on the resistance body is changed by rotating or sliding system, and a voltage that is certain to the position of the moving contact can be obtained between the moving contact and the fixed contact.   Potentiometer is a resistance element with three leads, and the resistance value can be adjusted according to a certain change law. Potentiometers usually consist of resistors and movable brushes. When the brush moves along the resistance body, the resistance value or voltage that is related to the displacement is obtained at the output end.   The potentiometer can be used as either a three terminal element or a two terminal element. The latter can be regarded as a variable resistor. Because its function in the circuit is to obtain an output voltage that is related to the input voltage (applied voltage), it is called a potentiometer.   In terms of application scope, digital potentiometers are rapidly promoted at home and abroad, and are widely used in detection instruments, PCs, mobile phones, household appliances, modern office equipment, industrial control, medical equipment and other fields. For example: refrigerator, programmable computer, power supply, power meter, automatic detection equipment, optical fiber network, adjusting LCD display, voltage control, replacing mechanical potentiometer, matching linear impedance, adjusting VCOM settings.

    1970-01-01 0

  • How does the common mode choke solve the problem of common mode interference?

    4-  Common mode chokes, also known as common mode inductors, are coils symmetrically wound on a closed magnetic ring in opposite directions and with the same number of turns. It is often used to filter common mode electromagnetic interference, suppress the outward radiation and emission of electromagnetic waves generated by high-speed signal lines, and improve the EMC of the system. In practical applications, it is generally to add common mode inductance to the differential signal line.   Signal interference is mainly divided into common mode interference and differential mode interference.   There are two forms of voltage and current changes when they are transmitted through wires, which we call "common mode" and "differential mode". In addition to these two wires, there is usually a third conductor, which is "ground". There are two kinds of interference voltage and current: one is that two wires are used as round-trip lines respectively; The other is that two wires are used as the going path and the ground wire is used as the return path. The former is called "differential mode" and the latter is called "common mode".   Usually, the electrical appliances we use are two-wire, a live wire [2] (L) and a zero wire (n). The zero wire is considered as the neutral line of three-phase electricity, and there is also a ground wire called ground wire. The interference between zero line and live line is called differential mode interference, and the interference between live line and ground line is called common mode interference.   Usually, on the line, the differential mode component and common mode component of the interference voltage exist at the same time, and because of the imbalance of the line impedance, the two components will transform into each other in transmission.   Then, how does the common mode choke solve the problem of common mode interference?   The principle of common mode inductance suppressing common mode interference is also very simple. According to the right-hand screw rule, when two coils with the same magnetic ring winding in the opposite direction pass through two voltages with the same polarity and equal amplitude, the magnetic flux generated is superimposed with each other, and the inductive reactance is: xl=wl, which is very large. The magnetic flux generated by the differential signal cancels each other.

    2024-05-14 0

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Shenzhen Smart-core cloud Information Technology Co,. Ltd（abbr.SMCC), relying on rich industry experience and resources of the Group Smart-Core Holdings (02166.HK) in the field of electronic component distribution, focuses on the independent distribution business of electronic components and e-commerce business.Based on a strong channel network and supplier database, it provides customers with convenient supply chain services such as Large-Batch Spot Procurement、Long-Term Ordering and Emergency Materials Procurement. In order to provide customers with comprehensive protection, we have set up a experienceed QC team to ensure that customers receive 100% qualified goods. In order to completely eliminate the harm caused by fake and shoddy products, we also cooperate with well-known third-party inspection agency, which can conduct in-depth professional testing on all products. In addition, SMCC has passed ISO9001:2015 certification and has become a member of ERAI. SMCC has a comprehensive distribution network covering Hong Kong, Shenzhen, Beijing, Shanghai, Hangzhou, Chengdu, Wuhan, Xiamen, Taipei, Europe, Japan, Singapore, Vietnam, India, etc. Efficiently and accurately meet the spot demand of local customers.
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