Patent ID: 8917104
Filing Date: 2014-12-23
Classification: G01R

Abstract:
1. A testing structure for monitoring electro-migration (EM) performance, comprising: an EM resistor having four point resistive measurement, wherein a first and a second terminal of the EM resistor provide current input and a third and a fourth terminal of the EM resistor provide a voltage measurement; a first PFET coupled to the first terminal of the EM resistor as a secondary side of a current mirror for supplying a test current; wherein the voltage measurement is obtained from a pair of switching transistors whose gates are controlled by a selection switch and whose drains are utilized to measure a voltage across the third and fourth terminals; and an inverter and two control PFETs coupled to the first PFET to allow the voltage measurement to be obtained while the first PFET is turned off and the selection switch is activated.