Accurate measurements of the transient details of switching a memristive switch are crucial to the elucidation of the switching mechanism. Such high-speed measurements are often plagued by artifacts. Here we describe a measurement technique capable of capturing the Set/Reset characteristics of memristive switches with high accuracy. This technique can accurately measure the transient current during the Set/Reset operation with rise times as short as 2 ns. The circuit is designed to cycle through (Set/Reset) and sense (read the state) rapidly in order to enable the study of endurance. The sense circuit is capable to measure currents as low as 30pA yielding accurate measurements of the resistance in the off state up to 1.6GΩ. Solid electrolyte Pt/Ta_2O_5/Cu memristive switches are examined that exhibit ON and OFF state resistance (R_(on) and R_(off)) ratios of >10~4 and endurance cycles of >6×10~4.
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