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2025-01-25 13:42本頁面
【正文】 ds of things you want. That might help.”And they might agree. The amount of voltage swing is mainly a circuit designer’s decision, but a good mask designer knows the options and when to suggest them.Rock Band Moves Inside Their HouseThe second item we talked about was asking the rock band to go inside their house. The house provided some isolation, some sound insulation. The sound had to get through the walls of the house before it got to our ears. Now, this is something we can definitely devise in layout.We can effectively hide a noisegenerating block behind a Wall of Death, as I call it. It’s a Wall of Death because it stops anything trying to get past. We mentioned this earlier.Figure 61 Put the noise inside a little houseSo, you make a wall. You make all the noisy circuitry go inside its own little house.There are various layout techniques to make that wall. How you build your wall depends on who you are, what process you have, and what test chips have been made. The method is variable, but one easy way is to wrap a big ring of ground substrate contacts around the whole block. Remember, noise travels through substrate very easily.As the noise tries to escape the block through the substrate, it first encounters a ground substrate contact. Hopefully, any noise voltages or noise currents will be attracted to this contact since it is grounded.F
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