Drive-Sense Frequency Mapping for Interference-Resistant Sensor Arrays
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Solution Overview
Problem
Current data communication systems face challenges in efficiently processing and interpreting signals from sensors due to interference and varying sensor characteristics, which affect the accuracy and reliability of data collection and communication.
Innovation Solution
The implementation of a drive sense circuit with a programmable reference signal generator and power signal change detection circuit, which provides a regulated source signal to sensors and detects changes in electrical characteristics to generate representative signals, improving signal interpretation and data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor circuit directly processes sensor signals without additional regulation, then the device complexity is reduced, but the measurement precision and reliability deteriorate due to interference and varying sensor characteristics
Solution Approach 1:
A drive sense circuit is introduced as an intermediary component between the sensor and the processing system. This drive sense circuit includes a regulated source signal generator that produces a controlled drive signal, and a sense amplifier that detects changes in the sensor output. The intermediary circuit regulates the drive signal to match reference characteristics and amplifies the sensor response, thereby improving measurement precision while managing complexity through modular design.
2Reliability
If a regulated source signal with reference characteristics is used to drive the sensor, then the reliability of data collection improves, but the device complexity increases due to additional circuit components
Solution Approach 1:
The drive sense circuit incorporates a feedback mechanism where the sense amplifier monitors the sensor output and feeds it back to a control input. The regulated source signal generator adjusts its output based on feedback from the sense amplifier to maintain the drive signal within desired parameters. This feedback loop ensures reliable data collection by compensating for variations in sensor characteristics and environmental conditions.
Solution Approach 2:
The drive sense circuit is designed to be universally applicable to multiple sensor types by using programmable reference characteristics. The regulated source signal generator can be configured with different reference voltages, currents, or waveforms to match various sensor requirements. This multi-functionality allows a single circuit design to reliably interface with diverse sensors without requiring custom circuitry for each sensor type.
3Measurement precision
If interference and varying sensor characteristics are not addressed, then the device complexity remains low, but the accuracy and reliability of data collection deteriorate
Solution Approach 1:
The drive sense circuit dynamically adjusts parameters of the drive signal based on sensor characteristics and operating conditions. The regulated source signal generator modifies voltage levels, current magnitudes, or frequency content of the drive signal to optimize sensor response. The sense amplifier adjusts its gain and bandwidth parameters to match the sensor output range. These parameter changes compensate for varying sensor characteristics and improve measurement accuracy across different operating conditions.
Solution Approach 2:
The drive sense circuit performs preliminary conditioning of the sensor signal before it reaches the processing system. The regulated source signal generator pre-establishes optimal drive conditions for the sensor, and the sense amplifier pre-amplifies and filters the sensor output signal. This preliminary action removes interference and standardizes the signal format, reducing the complexity of subsequent processing stages while improving data accuracy.
Data Source
AI summary
A data sensing circuit including a reference signal circuit, a reference signal combining circuit, drive-sense circuits, an array of sensors, sets of digital filters, and a processing module. The processing module provides a reference control signal to the reference signal circuit operable to generate a plurality of reference signals based on the reference control signal. The reference signal combining circuit transmits sets of reference signals to the drive-sense circuits operably coupled to an array of sensor. When the sensor is exposed to a condition, and is receiving the signal from the drive-sense circuits, an electrical characteristic of the sensor affects the signal, which is interpreted by the drive-sense circuit and converted to a digital signal to be filtered by the set of digital filters generating a frequency response for the array of sensors.