Self-Calibrating Sampling Circuit for Signal Deviation Compensation
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Solution Overview
Problem
There is a deviation between the input and output signals of a sampling circuit, which affects sampling precision and the stable operation of systems like POE systems.
Innovation Solution
A sampling assembly and method that include a self-calibration unit, a sampling unit, and switches to compensate for signal deviations by determining an error signal and using it to obtain a calibrated sampling signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sampling circuit is used to process signals, then signal processing function is achieved, but deviation between input and output signals occurs affecting sampling precision
Solution Approach 1:
The patent applies preliminary action by performing calibration before actual signal sampling. The self-calibration unit generates calibration signals and determines error signals in advance to compensate for deviations that would otherwise affect sampling precision. This pre-calibration process establishes correction data that is then applied during normal operation to maintain accuracy.
Solution Approach 2:
The patent implements feedback through the self-calibration unit that continuously monitors the deviation between input and output calibration signals, determines error signals, and uses these errors to adjust subsequent sampling operations. The feedback loop ensures that deviations are detected and corrected, maintaining sampling precision over time despite environmental variations.
2Measurement precision
If self-calibration unit with switches is added to compensate for signal deviation, then sampling precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the calibration function with the sampling circuit by integrating the self-calibration unit directly into the existing sampling architecture. The calibration unit shares resources with the sampling path, and switches are used to multiplex calibration and sampling functions through common circuit elements, reducing overall complexity despite adding calibration capability.
Solution Approach 2:
The self-calibration unit is designed with multi-functionality, serving both calibration and sampling operations. The same amplification and analog-to-digital conversion units are used for both calibration signals and actual sampling signals, allowing a single circuit structure to perform multiple functions and reducing the need for separate dedicated calibration hardware.
Data Source
AI summary
A sampling assembly and a sampling method are provided. A self-calibration unit controls a first switch to be turned on, to enable a first sampling signal to be input to a sampling unit. The sampling unit processes the first sampling signal to obtain a second sampling signal, and outputs the second sampling signal to the self-calibration unit. The self-calibration unit controls the first switch to be turned off, controls a second switch to be turned on, and outputs a first calibration signal to the sampling unit. The sampling unit processes the first calibration signal to obtain a second calibration signal, and outputs the second calibration signal to the self-calibration unit. The self-calibration unit determines an error signal based on the first calibration signal and the second calibration signal. The self-calibration unit obtains a calibrated third sampling signal based on the second sampling signal and the error signal.