Hybrid On-Chip Resistor Structure for Near-Zero Drift
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Solution Overview
Problem
On-chip resistors in integrated circuits experience resistance drift under electric current stress, and existing structures fail to optimize both drift effect and temperature coefficient of resistance effectively for various applications.
Innovation Solution
A hybrid resistor structure comprising two resistor bodies made of different materials with distinct drift effects, where one resistor body's resistance increases and the other decreases under electric current stress, are coupled together to achieve self-compensation and minimize overall resistance drift, utilizing different deposition conditions during plasma sputtering to control material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-material resistor body is used, then the structure is simple, but the resistance drift cannot be optimized for different applications
Solution Approach 1:
The resistor is divided into multiple resistor bodies (first resistor body and second resistor body) made of different materials. Each resistor body has different drift characteristics, allowing the overall resistor to achieve optimized performance by combining segments with complementary properties.
Solution Approach 2:
The patent uses composite material structures where the first resistor body and second resistor body are made of different materials with distinct drift effects. This composite approach enables the resistor to achieve both low drift and optimized temperature coefficient by selecting materials whose characteristics complement each other.
2Reliability
If resistor material is optimized for low drift, then drift effect is reduced, but temperature coefficient of resistance cannot be simultaneously optimized
Solution Approach 1:
The resistor is segmented into multiple bodies with different material compositions. The first resistor body can be optimized for low drift while the second resistor body is optimized for temperature coefficient, allowing both parameters to be independently optimized without compromise.
Solution Approach 2:
Different regions of the resistor (different resistor bodies) have different material properties tailored to specific functions. One region prioritizes drift reduction while another region prioritizes temperature coefficient optimization, achieving local quality optimization that benefits the overall device.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid resistor structure exhibits near-zero resistance drift over a range of operating currents, providing stable resistance performance under electric current stress, effectively addressing the drift and temperature coefficient optimization needs.
Implementation Method 1
utilizing different deposition conditions during plasma sputtering to control material properties
Data Source
AI summary
Structures for an on-chip resistor and methods of forming a structure for an on-chip resistor. The structure includes a first resistor body and a second resistor body coupled to the first resistor body. The first resistor body contains a first material having a first drift effect. The second resistor body contains a second material having a second drift effect that is different from the first drift effect.