Error Amplifier Offset Calibration for Continuous LDO Regulation
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Solution Overview
Problem
Conventional analog linear voltage regulators calibrate the error amplifier in isolation and do not account for offsets in the feedback circuitry, leading to inaccurate voltage regulation and the need for periodic recalibration, which can disrupt operation.
Innovation Solution
A low-power dynamic offset calibration method that adjusts both the error amplifier and feedback circuitry to maintain accurate voltage regulation, allowing for continuous operation without disrupting the analog linear voltage regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional calibration techniques are used to calibrate the error amplifier in isolation, then the calibration process is simple, but the voltage regulation accuracy deteriorates due to uncorrected offsets in feedback circuitry
Solution Approach 1:
The patent merges the calibration of the error amplifier with the calibration of the feedback circuitry into a single integrated calibration process. The calibration circuit simultaneously adjusts both components to cancel their combined offset effects, rather than calibrating them separately as in conventional techniques. This resolves the contradiction by maintaining calibration simplicity while improving voltage regulation accuracy through combined calibration of both error amplifier and feedback circuitry.
2Measurement precision
If periodic recalibration is performed to maintain accuracy, then voltage regulation precision is improved, but operational continuity deteriorates due to calibration disruptions
Solution Approach 1:
The patent implements a self-calibrating mechanism where the calibration circuit automatically performs offset cancellation during normal operation without requiring external intervention or system shutdown. The calibration process serves itself by continuously monitoring and adjusting the error amplifier and feedback circuitry offsets in real-time, maintaining voltage regulation accuracy while ensuring uninterrupted operational continuity.
3Measurement precision
If dynamic calibration during operation is implemented, then voltage regulation accuracy under varying conditions is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic calibration action where the calibration circuit operates at strategically selected intervals rather than continuously. The system monitors operating conditions and triggers calibration only when necessary, such as when temperature or supply voltage changes exceed predetermined thresholds. This periodic approach maintains high voltage regulation accuracy under varying conditions while minimizing power consumption by avoiding unnecessary continuous calibration operations.
Data Source
AI summary
Systems and methods are disclosed related to low-power dynamic offset calibration of an error amplifier. An analog linear voltage regulator circuit tracks changes between a reference voltage and a regulated voltage to keep the regulated voltage as close as possible to the reference voltage. The analog linear voltage regulator includes an error amplifier that measures the error between the reference and regulated voltages and feedback circuitry. The error amplifier and feedback circuitry should be calibrated to correct for any offset within the circuits. The described offset calibration technique not only compensates for the offset in the error amplifier but also cancels any mismatch in the feedback network. During operation, conditions such as temperature and supply voltage may vary causing the offset to change. The technique is low power and dynamically cancels the offset even when the linear regulator is operating to supply the desired voltage.