MIC5165 Datasheet, PDF (15/24 Pages) Micrel Semiconductor – Dual Regulator Controller for DDR3 GDDR3/4/5 Memory Termination

Micrel, Inc.
Ripple Measurements
To properly measure ripple on either input or output of a
switching regulator, a proper ring in tip measurement is
required. Standard oscilloscope probes come with a
grounding clip, or a long wire with an alligator clip.
Unfortunately, for high frequency measurements, this
ground clip can pick up high-frequency noise and
erroneously inject it into the measured output ripple.
By maintaining the shortest possible ground lengths on
the oscilloscope probe, true ripple measurements can be
obtained. This requires the removing of the oscilloscope
probe sheath and ground clip from a standard
oscilloscope probe and wrapping a non-shielded bus
wire around the oscilloscope probe. If there does not
happen to be any non-shielded bus wire immediately
available, the leads from axial resistors will work.
MIC5165
Figure 6. Low-Noise Measurement
June 2010
15
M9999-061510-B