Buffered Resistor Ladder Calibration Under Dynamic Signal Disturbance
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Solution Overview
Problem
Existing resistor ladder calibration methods are inaccurate when the ladders are part of a signal path or subject to dynamic events, due to disturbances that affect the calibration process.
Innovation Solution
A buffer, such as a cascode device, is used to isolate the third resistor ladder from disturbances in the second resistor ladder, allowing a calibrator to adjust the current and maintain a stable voltage ratio between the first and third resistor ladders, thereby calibrating the second voltage accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second resistor ladder is used directly in the signal path for calibration, then the calibration process is simple, but the calibration accuracy deteriorates due to disturbances from dynamic events
Solution Approach 1:
A buffer circuit is introduced as an intermediary between the second resistor ladder and the calibration circuit. This buffer isolates the calibration process from disturbances in the signal path, allowing accurate voltage sensing without being affected by dynamic events occurring in the second resistor ladder.
Solution Approach 2:
The system is divided into separate functional blocks: the second resistor ladder handling signal path operations, the buffer providing isolation, and the calibration circuit performing accurate measurements. This segmentation allows each component to perform its function without interfering with others.
2Measurement precision
If the second resistor ladder is isolated from the first resistor ladder, then calibration accuracy is improved, but the voltage ratio matching between ladders becomes more difficult to maintain
Solution Approach 1:
The buffer serves as an intermediary that provides electrical isolation while maintaining the functional relationship between the first and second resistor ladders. It allows independent operation and calibration of each ladder while preserving the overall voltage ratio relationship.
3Adaptability or versatility
If the calibration is performed continuously in the presence of dynamic events, then the system remains adaptive, but the calibration accuracy deteriorates due to noise and disturbances
Solution Approach 1:
The buffer enables continuous calibration by providing a stable, isolated measurement point that is not affected by dynamic events in the signal path. The calibration circuit can continuously monitor and adjust the voltage ratio without being disturbed by changing conditions in the second resistor ladder.
Data Source
AI summary
In one embodiment, a first resistor ladder includes a first voltage across the first resistor ladder. A second resistor ladder includes a second voltage across the second resistor ladder. A third resistor ladder includes a third voltage across the third resistor ladder. The calibrator receives the first voltage and third voltage and adjusts a current through the third resistor ladder to adjust the third voltage based on the received first voltage and third voltage. A buffer is configured to provide buffering for the third resistor ladder from the second resistor ladder. The third voltage of the third resistor ladder is stable even though the second voltage of the second resistor ladder is changing.