Ripple and Noise Measurements – 4 Hints
白皮书
In the last several years, the microcontroller market has exploded. Handheld devices need to do more while using less. Lowering supply voltages helps reduce power consumption. Therefore, many designs today have 3.3, 1.8, and even a 1.1 V supplies. The challenge is this: as those supplies have become smaller, so have the tolerances on those supplies.
Typical tolerances are now 1 – 5%. With quality and integrity of power supplies now more important than ever, you need to reduce the ripple, noise, and transients riding on your DC power rails and voltage lines. This will ensure they are clean and meet the required tolerance. But before you can reduce them, you need to measure them. And you need the measurment capability to detect smaller and faster AC signals riding on top of your DC signals.