1. Signal Crosstalk Crosstalk refers to the coupling phenomenon between two signal lines. Due to the close spatial distance, there will be unwanted inductive and capacitive coupling between the signal lines, leading to mutual interference. Capacitive coupling can cause coupling currents, while inductive coupling can cause coupling voltages. This is a tricky issue in circuit … Read more
A New Round of Teardown ActivitiesStarts in August, including drones, handheld oscilloscopes、computers、robot vacuums、smart watches、solid state drives、portable speakers, with many prizes and benefits, welcome to participate! As electronic engineers, we are quite fortunate compared to other engineering disciplines. Electronic products are not only rapidly developing and expanding their uses and functions, but our testing equipment provides … Read more
Introduction to EMMC Circuits EMMC (Embedded Multi Media Card) is a standard specification for embedded storage primarily aimed at products like mobile phones or tablets, established by the MMC Association. EMMC integrates a controller within the package, providing a standard interface and managing flash memory.The schematic for the 8-bit data signal is shown in Figure … Read more
Whether for smartphones or ultra-high-definition television screens, High Dynamic Range (HDR) cameras are no longer limited to delivering popular visual effects. An increasing number of high-performance cameras support Advanced Driver Assistance Systems (ADAS) and Autonomous Vehicle (AV) applications. For example, Waymo’s fifth-generation self-driving car is equipped with at least 29 cameras, in addition to 5 … Read more
The termination resistor for the CAN bus is generally 120 ohms. In fact, during design, it consists of two 60 ohm resistors connected in series. There are typically two nodes of 120Ω on the bus, which is a well-known fact for anyone with a basic understanding of the CAN bus. However, as someone who struggles … Read more
1. PCB Layout 1. Follow the layout principle of “big first, small later, difficult first, easy later”, meaning that important unit circuits and core components should be prioritized in the layout. 2. The layout must refer to the schematic diagram and place components according to the signal flow rules of the schematic. 3. The arrangement … Read more
01 Power Layout and Wiring Digital circuits often require non-continuous current, which can cause surge currents in some high-speed devices. If the power routing is long, the surge current can lead to high-frequency noise, which can then couple into other signals. In high-speed circuits, parasitic inductance, parasitic resistance, and parasitic capacitance are inevitable, so this … Read more
PCB Network News Optical modules have gained prominence in high-speed communication due to their ability to convert optical signals. The design of their PCB mainboard must meet special requirements such as high-speed transmission, heat dissipation, mounting, and hot-swapping, making it different from ordinary PCBs. The PCB of optical modules is a key component for achieving … Read more
(1) Pre-define digital, analog, and DAA signal wiring areas on the PCB. (2) Separate digital and analog components and their respective traces as much as possible, placing them in their designated wiring areas. (3) Keep high-speed digital signal traces as short as possible. (4) Keep sensitive analog signal traces as short as possible. (5) Allocate … Read more
When it comes to PCB boards, many friends might think of how ubiquitous they are around us, from all household appliances, various components inside computers, to various digital products; almost every electronic product will use PCB boards. So what exactly is a PCB board? A PCB board is a Printed Circuit Board, which serves as … Read more