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2020-09-21
Some problems should be paid attention to during hardware debugging. For example, before hardware debugging, the circuit board should be carefully inspected to observe whether there is a short circuit or open circuit (because the DSP PCB board wiring is generally dense and thin, the probability of this occurrence is relatively high). After power-on, whether some chips are particularly hot in your hands. If you find that some chips are hot, you need to immediately power off and recheck the circuit. After troubleshooting, check whether the crystal is oscillating and whether the reset is correct and reliable. Then use an oscilloscope to check whether the signals of the CLK-OUT1 and CLK-OUT2 pins of the DSP are normal. If they are normal, it indicates that the DSP itself is basically working normally.
2020-09-17
The less the lead bends between the pins of high-speed circuit devices, the better. It is best to use a full straight line for the wiring of the high-frequency circuit, which needs to be turned. It can be turned by a 45° broken line or a circular arc.
2020-09-16
The adoption of the 20H rule means to ensure that the edge of the power plane is at least 20 times smaller than the edge of the 0V plane, which is equivalent to the distance between the two planes. This rule is often required as a technology to reduce the emission from the side of the 0V/power plane structure (suppressing the edge radiation effect)
Parasitic capacitances exist in vias as well as parasitic inductances. In the design of high-speed digital circuits, the harm caused by the parasitic inductances of vias is often greater than the impact of parasitic capacitance. Its parasitic series inductance will weaken the contribution of the bypass capacitor and weaken the filtering effect of the entire power system.
2020-09-14
PCB is a widely used product. Almost all electronic and electrical equipment can be used, such as mobile phone, computer, automobile, display screen, air conditioner, remote control, etc., PCB will be used.
一、Protel Now push the AltiumDesigner. Domestic low-end design of the mainstream, the foreign basic no one use. Easy to learn, suitable for beginners, easy to start; Occupying more system resources, higher requirements for computer configuration. People who use Protel in China still have a considerable market, after all, the hardware circuit design of small and medium-sized companies is still in the majority of low-end.
2020-09-12
Via is one of the most important parts of Multilayer PCB. The cost of drilling usually accounts for 30% to 40% of the cost of PCB production. In short, every hole on a PCB can be called a via.
In the process of PCB design and production, engineers not only need to prevent PCB board from accidents in manufacturing process, but also need to avoid design errors.
How to avoid the negative effect of vias in high speed PCB design
We usually need to quickly estimate the resistance of a wire or a plane on a printed circuit board, rather than make a tedious calculation. Although there are available printed circuit board layout and signal integrity calculation programs that can calculate the wiring resistance, we sometimes hope to adopt a fast and rough estimation method in the design process.
With the improvement of product qualification rate, the pass through rate of product will be greatly improved. PCBA testing is a link in the whole production process of PCBA processing and an important means to control the product quality.
PCBA coating should be transparent and cover PCB and components evenly. Whether the coating is uniform or not is related to the coating method to a certain extent, which will affect the appearance of printed circuit board surface and the coating condition of corners. In SMT SMT chip processing, there will be a "deposition line" of coating accumulation or a small amount of bubbles at the edge of the board, which will not affect the function and reliability of the coating.
The reflow soldering process of SMT chip requires that the pads of two end chip components should be independent pads. When the pad is connected with a large area of ground wire, the cross paving method and 45 ° paving method should be preferred; the length of the wire leading from the large area ground wire or power line is greater than 0.5mm, and the width is less than 0.4mm; the wire connected with the rectangular pad should be led out from the center of the long side of the pad to avoid a certain angle.
High frequency PCB(HF PCBs) for HF/Microwave are produced using a special method for copper-clad laminates on microwave substrates, usually referred to as >1GHz boards.
Circuit principle is divided into electronic circuit and "power circuit", which is generally referred to as "strong current" or "weak current" circuit; it refers to the "direction" path of the circuit in the aspects of manufacture
In the schematic diagram of digital circuit, the transmission of digital signal is from one logic gate to another. The signal is sent from the output end to the receiving end through the wire, which seems to be unidirectional flow.
What problems should be paid attention to in PCB stack design? Now let the ipcb engineers tell you.There are two rules to follow when designing a stack.
Precision machining, it is easy to damage components due to improper operation or other reasons. Therefore, what principles should ipcb follow in PCBA processing link and operation process?
For experienced engineers, PCB circuit design is very simple, all kinds of matters needing attention and operation skills are handy, very skilled. For new engineers, PCB circuit design skills are difficult, after all, their own proficiency is not good, there will be problems in design.
PCBA design can't be completed by one person, it must be completed by teamwork. Therefore, if you want to design a good circuit board, you must have strong team support. ipcb company has stable and mature experience in PCBA production.
