Sinrace Power Supply Technology (Shenzhen) Co., Ltd.
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资质认证
| How does the power supply noise happen? |
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Before we go any further, let's consider where noise comes from. Ideally there wouldn't be any noise on your power supplies. How did it get there?
In addition to simple Gaussian noise that arises due to unavoidable thermal processes, which by the way is usually NOT the dominant source of noise, almost all noise on power supplies comes from one of two sources. Switching power supplies create their own undesired noise, usually at harmonics of the switching frequency or coherent to the switching frequency. When gates, and especially output pin drivers, switch, this creates transient current demands on the power supplies. This is usually the primary source of noise in most digital circuits. These events may appear random in time, however they tend to be coherent with clocks in the system. Once we realize we can think about these influences as "signals" superimposed on the power supply instead of thinking about them as "noise," the analysis gets a lot simpler and more powerful. |
