Series Resistor Temperature Compensation via Dimensional Tuning
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Solution Overview
Problem
Integrated circuits (ICs) face challenges in maintaining uniform resistance due to varying temperature coefficients of resistors, especially when resistors with different temperature coefficients are arranged in series, leading to instability in operating characteristics as ICs integrate smaller elements.
Innovation Solution
A resistor configuration with a first resistor having a negative temperature coefficient and a second resistor with a positive temperature coefficient, where the dimensions of the second resistor are adjusted to satisfy the equation x = −(Tp × Rp) / (Ta × Ra), ensuring that the combined resistance remains uniform across a range of operating temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resistors with different resistance temperature coefficients are arranged in series, then the resistor configuration can be formed using standard manufacturing processes, but the combined resistance becomes non-uniform and unstable across temperature changes
Solution Approach 1:
The patent applies parameter changes by adjusting the dimensions (width and length) of resistors with different resistance temperature coefficients to satisfy a specific equation. This dimensional parameter adjustment compensates for temperature-induced resistance variations, maintaining uniform combined resistance across temperature changes while using standard manufacturing processes.
Solution Approach 2:
The patent uses a composite resistor configuration combining different resistor types (polysilicon and impurity region) with opposite resistance temperature coefficients. This composite structure leverages the complementary temperature characteristics of different materials to achieve temperature-stable combined resistance.
2Stability of the object's composition
If a separate temperature compensation circuit is used to maintain uniform resistance, then resistance stability across temperature changes is improved, but the number of manufacturing processes increases and overall cost increases
Solution Approach 1:
The patent extracts the temperature compensation function from a separate circuit and integrates it directly into the resistor structure itself. By incorporating compensating resistors with opposite temperature coefficients into the same resistor configuration, the compensation function is built-in, eliminating the need for additional temperature compensation circuits and reducing manufacturing complexity.
Solution Approach 2:
The patent merges the resistance function and temperature compensation function into a single integrated resistor configuration. The series combination of resistors with different temperature coefficients performs both the primary resistance function and the temperature compensation function simultaneously, reducing device complexity and manufacturing steps.
3Productivity
If IC elements become smaller due to increasing integration, then device integration is improved, but the inherent operating characteristics become more susceptible to temperature changes
Solution Approach 1:
The patent uses parameter changes (dimensional adjustments) to compensate for temperature effects on small-scale IC elements. By carefully controlling the width and length parameters of resistors according to the specified equation, the design maintains stable operating characteristics even as element sizes decrease due to higher integration.
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
This configuration effectively cancels out resistance changes in both resistors when connected in series, maintaining a nearly zero resistance ratio across the operating temperature range, thus stabilizing the overall resistance of the IC.
Implementation Method 1
a first resistor having a first width and a first length and having a negative resistance temperature coefficient
Implementation Method 2
a second resistor serially connected to the first resistor, the second resistor having a positive resistance temperature coefficient
Data Source
AI summary
A resistor having a uniform resistance, in which a serial resistance of resistors with different resistance temperature coefficients is not influenced by change in temperature, and a semiconductor device using the same includes: a first resistor having a first width and a first length and having a negative resistance temperature coefficient; and a second resistor serially connected to the first resistor, the second resistor having a positive resistance temperature coefficient, wherein the second resistor has a second width and a second length of different dimensions to satisfy a following Equationx=−(Tp×Rp)/Ta×Ra, where Tp and Ta are the respective resistance temperature coefficients of the first and the second resistors, and Rp and Ra are the respective sheet resistances of the first and the second resistors.