AFE Offset Calibration Using Selective Modules and Common-Mode Voltage
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently calibrating offset in analog front end (AFE) circuits due to interactions between elements, which affect the operation of semiconductor modules.
Innovation Solution
An electronic device with an AFE circuit and a processor that provides a user interface for firmware updates, allowing users to determine target modules for offset calibration, apply common mode voltage at specific positions, and define calibration sequences to compensate for offsets using digital codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offset calibration is performed on all modules in the AFE circuit, then the accuracy of signal processing is improved, but the calibration time and complexity increase significantly
Solution Approach 1:
The AFE circuit is divided into multiple independent modules (e.g., HF module, VGA module, DFE module, sampler module), and offset calibration is performed selectively on specific modules rather than all modules. The processor determines a target module based on user input and calibration requirements, applying calibration only where needed. This segmentation approach reduces overall calibration time while maintaining necessary accuracy for signal processing.
2Measurement precision
If offset calibration is performed on all modules in the AFE circuit, then the accuracy of signal processing is improved, but the device complexity and computational load increase
Solution Approach 1:
Different modules within the AFE circuit are treated with different calibration priorities and methods. The processor identifies specific target modules that require calibration based on their functional importance and offset sensitivity. For example, certain modules may require full calibration sequences while others need simplified calibration or no calibration at all. This local quality approach optimizes the balance between accuracy and complexity by applying appropriate calibration intensity to each module.
3Loss of time
If selective calibration of specific modules is performed, then the calibration time is reduced, but the accuracy of overall signal processing may be compromised
Solution Approach 1:
The system incorporates feedback mechanisms where the processor monitors signal processing performance and identifies modules that require calibration based on actual operational needs. User input through the interface provides feedback on which modules to calibrate, and the system adjusts calibration sequences dynamically. This feedback-driven approach ensures that calibration is performed on the right modules at the right time, maintaining accuracy while minimizing unnecessary calibration operations.
Data Source
AI summary
An electronic device includes an analog front end (AFE) circuit including plural modules, and a processor that provides a user interface for a firmware update, determines a target module, of which offset calibration is to be performed, among the plural modules, based on a user input to the user interface, determines a position within in the AFE circuit to which a common mode voltage is to be applied to perform the offset calibration of the target module, and determines an offset calibration sequence including the target module and the position.