Operation Circuit Calibration Method Reducing Offset Drift Time
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Solution Overview
Problem
Conventional operation circuits require frequent interruptions for calibration due to variant offsets caused by manufacturing imperfections and temperature changes, leading to inefficient operation and unnecessary power loss.
Innovation Solution
A calibration method that configures the operation circuit to alternate between calibration and operation modes using a reduced bit number calibration procedure, updating the adjustment parameter and operation calibration code to minimize calibration time while maintaining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complete dichotomous search method is executed during each calibration procedure to update the adjustment offset, then the calibration precision is maintained, but the calibration time increases and operation interruptions are frequent
Solution Approach 1:
The patent applies partial action by determining whether to execute a complete N-bit dichotomous search or a reduced M-bit search based on calibration needs. When offset variation is small, only M bits (where M < N) are calibrated, achieving sufficient precision without the full calibration overhead. This selective approach reduces calibration time while maintaining adequate precision for the application.
Solution Approach 2:
The patent implements dynamic calibration by adapting the calibration procedure length based on detected offset variation. The system monitors whether the variant offset has changed significantly and dynamically selects between full N-bit calibration and reduced M-bit calibration. This dynamic adjustment optimizes the balance between calibration precision and time consumption based on actual circuit conditions.
2Measurement precision
If calibration is performed frequently to maintain precision despite variant offset changes, then measurement accuracy is preserved, but operation efficiency decreases and power consumption increases
Solution Approach 1:
The patent implements periodic calibration with variable frequency based on detected offset drift. Instead of fixed frequent calibration, the system performs calibration periodically but adapts the frequency based on whether significant offset variation is detected. When the comparator operates within acceptable tolerance, calibration is deferred, improving operational efficiency while maintaining accuracy when needed.
Solution Approach 2:
The system performs partial calibration (M-bit search instead of complete N-bit search) when full precision is not required, reducing the computational burden and time spent on calibration. This partial action approach maintains sufficient measurement accuracy for normal operation while minimizing interruptions to productivity.
3Measurement precision
If a complete dichotomous search method is executed during calibration, then the adjustment offset is accurately updated, but power loss increases due to extended calibration duration
Solution Approach 1:
The patent reduces power consumption during calibration by performing only M-bit search instead of complete N-bit search when full precision is not required. This partial calibration approach maintains sufficient offset accuracy while significantly reducing the duration of high-power calibration operations, thereby minimizing energy loss during calibration cycles.
Data Source
AI summary
A calibration method is configured for calibrating an operation circuit which has a variant offset. The operation circuit includes at least one comparator circuit having a first variant offset. The calibration method provides an adjustable offset to calibrate the variant offset. The method includes: resetting an adjustment parameter to an initial value and configuring the operation circuit to a calibration mode; conducting an initial calibration procedure according to a comparison result of the comparator circuit, to decide an operation calibration code having plural bits; configuring the operation circuit to an operation mode; conducting a predetermined operation procedure according to the operation calibration code, wherein the operation calibration code corresponds to the adjustable offset; conducting a less bit number calibration procedure according to the adjustment parameter and a test calibration code to update the adjustment parameter or the operation calibration code; and repeating the above.