Test structures for evaluating a fabrication of a die or a wafer
First Claim
1. A test structure for evaluating a fabrication of a wafer, the test structure comprising:
- a combination of device and interconnect elements that are provided on an active region of a die on the wafer prior to the fabrication of the wafer being completed, the combination of device and interconnect elements including one or more circuits that are activatable to produce an output corresponding to measurable electrical and/or optical characteristics;
wherein the combination includes a power receiving element that is configured to receive activation energy sufficient to cause the output on a contactless medium, so that the activation energy is received without affecting a usability of the die or wafer;
wherein the one or more circuits are structured to generate an output that is measurably responsive to a device parameter or a process variation in a specific fabrication step.
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Accused Products
Abstract
The fabrication of the wafer may be analyzed starting from when the wafer is in a partially fabricated state. The value of a specified performance parameter may be determined at a plurality of test structures located on an active area of a die of the wafer. The specified performance parameter is known to be indicative of a particular fabrication process in the fabrication. Evaluation information may then be obtained based on a variance of the value of the performance parameter at the plurality of locations. This may be done without affecting a usability of a chip that is created from the die. The evaluation information may be used to evaluate how one or more processes that include the particular fabrication process that was indicated by the performance parameter value was performed.
209 Citations
16 Claims
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1. A test structure for evaluating a fabrication of a wafer, the test structure comprising:
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a combination of device and interconnect elements that are provided on an active region of a die on the wafer prior to the fabrication of the wafer being completed, the combination of device and interconnect elements including one or more circuits that are activatable to produce an output corresponding to measurable electrical and/or optical characteristics; wherein the combination includes a power receiving element that is configured to receive activation energy sufficient to cause the output on a contactless medium, so that the activation energy is received without affecting a usability of the die or wafer; wherein the one or more circuits are structured to generate an output that is measurably responsive to a device parameter or a process variation in a specific fabrication step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification