Ultra-low Impedance (100 micro ohm and lower) Measurement Using 2-Port Shunt-Through

PDN Measurement for Power Integrity

Measuring ultra-low impedance is a common requirement for assuring power integrity. This means measuring 1 milliohm to 2 milliohm voltage regulator modules (VRMs) and power distribution networks (PDNs). Today, it is common to see 500 uOhm power rails, however more recently the bleeding edge is below 100 uOhm. Measuring 100 uOhm is a significant challenge, even using the venerable 2-port shunt-thru measurement that has served as the staple of ultra-low impedance measurement. The dynamic range of the 100 uOhm, 2-port, measurement is 108dB. An impedance dip to 30 uOhm reduces this to 118 dB. Explore below to tackle this fundamental problem.

2-Port Solution

Keysight E5061B or E5071C ENA Vector Network Analyzer

Do you have a vector network analyzer?

Ground Loop Isolator

What ground loop isolator is required?

Connections & Test Standards

What accessories are available?

Power Integrity Book

By Steve Sandler

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