Bandgap Reference Voltage Trimming for Sensor Calibration
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Solution Overview
Problem
Integrated temperature and voltage sensors face accuracy limitations due to bandgap voltage variation, requiring calibration for improved precision beyond ±2°C over a specific temperature range.
Innovation Solution
A method to calibrate both temperature and voltage sensor circuitry by trimming the bandgap reference voltage variation to zero or approximately zero using a single trim value, allowing for high accuracy temperature and voltage sensing with shared calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate calibration is performed for temperature sensor circuitry and voltage sensor circuitry, then calibration accuracy is improved, but device complexity and calibration time increase
Solution Approach 1:
The patent combines the calibration of temperature sensor circuitry and voltage sensor circuitry into a single unified process. The sensor calibration circuitry simultaneously calibrates both temperature and voltage sensors using a common trim parameter value, eliminating the need for separate calibration procedures and reducing overall calibration complexity.
Solution Approach 2:
The sensor calibration circuitry is designed to perform multiple calibration functions using a single trim parameter. The same calibration value is used to correct errors in both temperature sensor data and voltage sensor data, making the calibration process universal and applicable to multiple sensor types without requiring separate calibration mechanisms.
2Productivity
If a single trim value is used for both temperature and voltage sensor calibration, then calibration time and cost are reduced, but measurement precision may be compromised
Solution Approach 1:
The patent changes the trim parameter value based on the type of sensor being calibrated. The sensor calibration circuitry determines whether to apply a first trim parameter value for temperature sensors or a second trim parameter value for voltage sensors, allowing optimization of calibration speed and precision for each sensor type while using a unified calibration architecture.
Solution Approach 2:
The calibration system dynamically selects and applies appropriate trim parameter values based on real-time conditions and sensor type. The sensor calibration circuitry can switch between different calibration approaches and parameter sets, making the calibration process adaptive and optimized for both speed and accuracy requirements.
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 approach enables high accuracy temperature and voltage sensing with a single calibration value, reducing costs and simplifying the calibration process, while improving precision across various system applications.
Implementation Method 1
techniques for calibrating both temperature sensor circuitry and voltage sensor circuitry of temperature/voltage sensor circuitry by trimming variation in a bandgap reference voltage, which is common between the temperature sensor circuitry and the voltage sensor circuitry, to zero or approximately zero using a single trim value
Data Source
AI summary
Techniques for calibrating both temperature sensor circuitry and voltage sensor circuitry of temperature/voltage sensor circuitry by trimming variation in a bandgap reference voltage, which is common between the temperature sensor circuitry and the voltage sensor circuitry, to zero or approximately zero using a single trim value.