Resistor Circuit with Opposite Temperature Coefficients
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Solution Overview
Problem
Semiconductor devices and integrated circuits face temperature-dependent performance issues due to the temperature dependence of charge carrier mobility and resistivity, making it challenging to maintain consistent performance across varying temperatures.
Innovation Solution
A method of forming a resistor circuit by simultaneously doping two types of resistors with opposite temperature coefficients, allowing for compensation of temperature-dependent variations and reducing the influence of process variations, resulting in a temperature-independent resistor circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate doping processes are used for different resistor types, then manufacturing flexibility is maintained, but process variations cause temperature coefficient mismatches and reduced circuit performance
Solution Approach 1:
The patent combines multiple doping operations into a single simultaneous doping process. First and second resistor regions of different types are doped together in one process step using a single dopant source, ensuring identical doping conditions. This merging eliminates process variation mismatches between separately doped regions while maintaining the ability to create different resistor types through selective masking and geometric configuration.
2Manufacturing precision
If a single doping process is used for all resistors, then process variation influence is reduced, but manufacturing flexibility and ability to create different resistor types is limited
Solution Approach 1:
The patent applies local quality by creating different resistor types within the same doped structure through selective masking and geometric configuration. First and second resistor regions are formed with different patterns, orientations, or connections to achieve different resistance values and temperature coefficients from a uniformly doped substrate, allowing versatility without sacrificing doping consistency.
3Adaptability or versatility
If resistors are designed for wide temperature range operation, then circuit robustness is improved, but temperature-dependent performance variations increase
Solution Approach 1:
The patent creates a composite resistor circuit by combining first and second resistor regions with opposite temperature coefficients in a single doped structure. These composite regions work together to compensate for temperature-dependent performance variations, enabling wide temperature range operation while maintaining consistent circuit performance through inherent temperature compensation.
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 method effectively compensates for temperature-dependent variations in resistivity and sheet resistance, making the resistor circuit less sensitive to process variations and achieving temperature independence across a wide temperature range.
Implementation Method 1
simultaneously doping a first part of the first resistor and a second part of the second resistor
Data Source
AI summary
A method of forming a resistor circuit, the method comprising forming a first resistor comprising a first type of resistor, forming a second resistor comprising a second type of resistor, the first type of resistor being different from the second type of resistor and simultaneously doping a first part of the first resistor and a second part of the second resistor, the first resistor and the second resistor being configured such that doping of the first part of the first resistor and the second part of the second resistor defines a temperature coefficient of the first resistor and a temperature coefficient of the second resistor, wherein the temperature coefficient of the first resistor and the temperature coefficient of the second resistor have opposite signs.