Description:
The single port impedance reflection measurement can give distorted results at low impedances. This limits its usability. However, it is very useful for quickly assessing stability problems in low power circuits across an entire card. This test measures the impedance and stability of a point of load regulator under different loading conditions.

Description:
Control loop stability is traditionally determined from an open loop Bode plot in the frequency domain. Phase margin (phase at 0dB gain) and gain margin (gain at 0° phase) are the two stability assessments. Though systems don’t always provide Bode plot access. This test establishes a baseline for comparison with the non‐invasive stability assessment.

Description:
This test measures the output impedance and the corresponding group delay of an opamp buffer. The change in the stability response is analyzed for different loading capacitances.

Description:
This test measures the Bode plot of the BJT voltage regulator on the VRTS1.5 board. The impact of output capacitors loading is demonstrated.