Analog Front-End Offset Correction Using Gain-Based Compensation
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Solution Overview
Problem
Existing analog front-end (AFE) circuit offset voltage correction methods require significant time and resources, either through lengthy training processes or the generation and storage of numerous correction codes, leading to inefficiencies and increased costs.
Innovation Solution
An offset voltage correction method for AFE circuits that involves obtaining offset voltages from differential input transistor pairs and tail current sources, generating compensation information based on predetermined DC gains and these offset voltages, and using this information to correct the output voltage of the amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correction codes are generated and stored for various gain settings, then offset voltage correction is achieved, but circuit area increases due to storage requirements
Solution Approach 1:
The patent extracts only the essential correction information needed for offset voltage compensation. Instead of storing complete correction codes for all gain settings, the system extracts and stores only the critical offset voltage values that can be used to correct multiple gain settings, significantly reducing storage area requirements while maintaining correction effectiveness.
Solution Approach 2:
The stored offset voltage correction information is designed to be universally applicable across multiple gain settings. A single set of correction data can be reused for different gain configurations, eliminating the need to generate and store separate correction codes for each gain setting, thus reducing circuit area while maintaining comprehensive correction capability.
2Reliability
If programming is performed for various gain settings, then offset voltage correction is achieved, but training time increases
Solution Approach 1:
The patent performs offset voltage measurement and correction information generation in advance during the manufacturing process. The correction data is pre-calculated and stored in the circuit before deployment, eliminating the need for time-consuming training or programming operations when the system is put into use, thus significantly reducing training time while ensuring accurate correction.
3Reliability
If multiple correction codes are generated, then offset voltage correction for various gain settings is achieved, but test time increases
Solution Approach 1:
The patent extracts only the necessary correction parameters from the full set of possible correction codes. By identifying and measuring only the essential offset voltage components during testing, the system avoids the need to generate and verify multiple complete correction codes, thereby reducing test time while maintaining comprehensive correction coverage for all gain settings.
Data Source
AI summary
Disclosed are an analog front-end (AFE) circuit and an offset voltage correction method thereof. The offset voltage correction method includes: obtaining the first offset voltage generated by the differential input transistor pair of the first amplifier in the AFE circuit, and generating first information according to the first offset voltage; obtaining a second offset voltage generated by a tail current source of the first amplifier in the AFE circuit, and generating second information according to the second offset voltage and the first information; obtaining a predetermined first DC gain and a predetermined second DC gain, and generating first compensation information by performing calculation based on the first DC gain, the second DC gain, the first information and the second information; and correcting an output voltage generated by the first amplifier based on the first compensation information.