Making Ripple and Noise Measurements on DC Voltage Lines and Power Rails

Application Notes

Power in an integrated circuit design is a tightly controlled commodity. In the last several years, as the affordable microcontroller market has exploded, there have been increasing demands on power distribution networks, resulting in lower supply voltages. Lowering the supply voltages helps to reduce power consumption. Many designs today have 3.3 V, 1.8 V and even a 1.1 V supply, and as those supplies have become smaller, so have the tolerances on those supplies. Tolerances have dropped from 10% to “1% - 5%”.

You need to scrutinize DC power rails and voltage lines for quality and integrity. Ripple, noise and transients are riding on those voltage rails, and before you can reduce them, you need to measure them. The goal is to make sure that the power rail is clean. Fundamentally, you need to measure ever smaller and faster AC signals riding on top of the DC ones.

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Making Ripple and Noise Measurements on DC Voltage Lines and Power Rails

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