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较大世纪东方Designing a high-speed PCB can be a rite of passage for many junior-level PCB designers. While intuition and some best practices can make most low-speed PCB’s work just fine, high-speed PCB design relies on impedance control and precise calculations to ensure reliability. The goal of impedance control is to maximize signal power transfer from a driver to receiver, to minimize signal distortion caused by reflections, and to minimize the electromagnetic interference generated by critical signals. The one guiding factor for all things related to impedance control is that as the speed of a signal increases, it starts to behave less and less like a perfect-world model, and more like a transmission line. The burning question in most designers’ heads is, “how important is impedance control in my design?” The answer to which is, as always, it depends. What defines a high-speed signal and when should impedance control be considered? If a connection is n...

Designing a high-speed PCB can be a rite of passage for many junior-level PCB designers. While intuition and some best practices can make most low-speed PCB’s work just fine, high-speed PCB design relies on impedance control and precise calculations to ensure reliability. The goal of impedance control is to maximize signal power transfer from a driver to receiver, to minimize signal distortion caused by reflections, and to minimize the electromagnetic interference generated by critical signals. The one guiding factor for all things related to impedance control is that as the speed of a signal increases, it starts to behave less and less like a perfect-world model, and more like a transmission line. The burning question in most designers’ heads is, “how important is impedance control in my design?” The answer to which is, as always, it depends. What defines a high-speed signal and when should impedance control be considered?If a connection is not physically short, then impedance contr...

I just designed a switching PSU that converts 120V AC to 42V DC, and is capable of 20amps. Just realized I need to create a dual supply for an audio amp I am creating, so I want to convert my single supply design into a dual supply. Every dual supply schematic I look at, the common ground is connected to the center tap of the transformer. But my single supply PSU does not have a transformer on the high voltage side, so Im just wondering,where would the common ground point even be, and is it even possible to create a dual supply without a transformer?Do I need to add a transformer, or a second bridge rectifier, for a dual supply? I was trying to draw something up with a second bridge, but I just dont see how I would do it. Or could I just invert the voltage after the buck converter/capacitance multiplier? I would add a transformer, if I could find one that can do 20 amps on the secondary, but they are all like $100, unless its only 12V. On aliexpress they sell a +/-35V dual PSU for ar...

A demonstration of near-field magnetic interference and how to shield it. Near-field vs far-field EMC explained.

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