A bridge circuit for the characterization of electrically programmable elements

A method for programming and characterizing electrically programmable elements of the antifuse type (i.e normally open) is described. The programming conditions are controlled by two transistors which isolate the programmable element (PEL) from the bias and common lines. The isolation from the external parasitic capacitance allows programming under conditions similar to that within a VLSI circuit. A parallel branch between the bias and common lines is added after programming to form a bridge structure. The PEL affects the symmetry of the bridge and its postprogramming electrical characteristics are measured indirectly after balancing the bridge. The operation of such circuit is demonstrated. A short discussion and some design consideration are also presented.<
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