On-Substrate Stress Sensing and Compensation Circuit
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Solution Overview
Problem
Mechanical stress on semiconductor substrates affects the physical dimensions and properties of electronic devices, leading to changes in operating parameters, and existing circuitry for monitoring and compensating this stress increases complexity and requires complex mathematical calculations.
Innovation Solution
A circuit design that includes resistors oriented in specific directions to detect stress and a compensation circuit that uses a Wheatstone bridge-based analog frontend to generate a compensated signal, reducing the need for complex calculations by directly canceling out stress components in the analog domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuitry is added to monitor and compensate for mechanical stress, then the accuracy and stability of device operations is improved, but the circuit complexity increases
Solution Approach 1:
The patent replaces complex digital signal processing and mathematical calculations with an analog Wheatstone bridge circuit that directly compensates for stress-induced resistance changes. The bridge circuit uses passive components (resistors, capacitors) and operational amplifiers to automatically generate compensation signals in the analog domain, eliminating the need for complex digital algorithms and reducing overall circuit complexity while maintaining high accuracy.
Solution Approach 2:
The patent introduces a Wheatstone bridge circuit as an intermediary mechanism between the stress-sensing resistors and the final output. This bridge circuit acts as a mediator that automatically balances and compensates for stress effects through its inherent analog processing capabilities, using trimmable resistors and operational amplifiers to generate compensation signals without requiring complex external processing.
2Measurement precision
If complex mathematical calculations are used for stress compensation, then the measurement precision is improved, but the processing time and computational resources increase
Solution Approach 1:
The patent substitutes complex mathematical post-processing calculations with real-time analog computation performed by the Wheatstone bridge circuit. The operational amplifiers and passive components continuously perform the compensation calculations in the analog domain, providing immediate stress compensation without requiring digital signal processing or mathematical algorithms, thus eliminating post-processing time delays.
Solution Approach 2:
The patent performs stress compensation in advance through the analog circuitry before the signal reaches any digital processing stage. The Wheatstone bridge circuit proactively balances the stress-induced resistance changes in real-time, so that by the time the compensated signal is output, the compensation has already been applied, eliminating the need for subsequent mathematical corrections or post-processing calculations.
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 solution effectively compensates for mechanical stress without requiring complex mathematical processing, improving the accuracy and stability of electronic device operations by directly addressing stress-induced changes in the analog domain.
Implementation Method 1
a first resistor configured to detect stress in a direction
Implementation Method 2
a compensation circuit that uses a Wheatstone bridge-based analog frontend to generate a compensated signal
Data Source
AI summary
In described examples, a circuit includes a substrate and a first resistor on the substrate, the first resistor in a first direction. The circuit also includes a second resistor on the substrate, the second resistor coupled to the first resistor, the second resistor in a second direction, the second direction and the first direction transversely oriented and a device on the substrate.