Drive-Sense Circuit Calibration for Single-Line Sensor Signals
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Solution Overview
Problem
Current data communication systems face challenges in efficiently processing and interpreting signals from a variety of sensors across different applications, including industrial, healthcare, and transportation sectors, due to the complexity of sensor characteristics and the need for precise signal interpretation and actuation.
Innovation Solution
The implementation of drive-sense circuits that can simultaneously drive and sense signals via a single line, enabling efficient communication and processing of sensor data across various physical conditions, and also power actuators, using a combination of power source circuits and change detection circuits to generate representative signals for computing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate drive and sense circuits are used for sensors, then signal accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines drive and sense circuits into a single integrated circuit that can simultaneously perform both functions. The circuit includes a drive amplifier that can output drive signals and a sense amplifier that can read sensor signals, with switching mechanisms that allow the same circuit components to serve dual purposes, thereby reducing overall system complexity while maintaining signal accuracy.
Solution Approach 2:
The integrated circuit is designed with multi-functional capabilities where the same circuit components can operate in different modes. The circuit can function as a drive circuit when outputting signals to actuators and as a sense circuit when reading sensor data, eliminating the need for separate dedicated circuits and reducing device complexity.
2Reliability
If multiple separate lines are used for driving and sensing, then signal interference is reduced, but power consumption and system complexity increase
Solution Approach 1:
The patent merges drive and sense operations onto a single communication line between the transducer and the integrated circuit. Time-division multiplexing and switching mechanisms are employed to separate drive and sense signals in time, allowing the same physical line to carry both types of signals without interference, thereby reducing power consumption while maintaining signal integrity.
Solution Approach 2:
The circuit employs periodic switching between drive and sense modes on the same communication line. The switching mechanism alternates between outputting drive signals and reading sense signals in time-division multiplexed fashion, allowing single-line operation without signal interference and minimizing power consumption compared to maintaining multiple simultaneous lines.
3Ease of operation
If calibration procedures are simplified, then ease of operation is improved, but manufacturing precision may be compromised
Solution Approach 1:
The integrated circuit includes built-in self-calibration capabilities that automatically adjust for transducer variations without requiring complex external calibration procedures. The circuit can perform self-diagnosis and automatic gain adjustment, allowing users to simply connect the transducer and achieve accurate operation through automated processes rather than manual calibration steps.
Solution Approach 2:
The circuit incorporates feedback mechanisms that continuously monitor sensor output and automatically adjust drive parameters to maintain optimal performance. This closed-loop control enables the system to compensate for manufacturing variations and achieve high precision without requiring complex external calibration procedures, as the system self-adjusts based on actual performance feedback.
Data Source
AI summary
An automated system includes transducers, at least one computing device, and at least one automated apparatus. The transducer(s) is/are driven and sensed using drive-sense circuit(s). A drives and senses drive and sense a transducer via a single line, generates a digital signal representative of a sensed analog feature to which the transducer is exposed, and transmits the digital signal to the computing device. The computing device receives digital signals from at least some of drive-sense circuits and process them in accordance with the automation process to produce an automated process command. The automated apparatus executes a portion of an automated process based on the automated process command.