Integrating Amplifier Sensor Circuit for Biochip Noise Reduction
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Solution Overview
Problem
Current biochip technologies face challenges in achieving high sensitivity and reducing noise in miniaturized sensing tools due to limitations in signal measurement and processing within small form factors, particularly in biochips with arrays of cells.
Innovation Solution
The implementation of an integrating amplifier-based sensor circuit that continuously integrates signals without sampling, using a trip flag to terminate integration and minimize noise, allowing for autonomous operation of each cell and reducing the need for pre-amplifiers and multiplexing, thereby enhancing signal-to-noise ratio and reducing die area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sampling-based signal measurement is used in miniaturized biochips, then device complexity is reduced, but measurement precision and signal-to-noise ratio deteriorate
Solution Approach 1:
The patent merges the sensor element, integrating amplifier, and trip flag logic into a single autonomous sensor cell. The integrating amplifier continuously integrates sensor output signals without sampling, and the trip flag autonomously terminates integration when a threshold is reached, combining multiple functions into one compact unit that improves signal-to-noise ratio while minimizing die area.
Solution Approach 2:
Each sensor cell operates autonomously with self-contained integration and threshold-detection capabilities. The trip flag mechanism automatically terminates the integration cycle when the integrated signal reaches a predetermined threshold, eliminating the need for external sampling control and enabling independent operation that reduces overall system complexity.
2Measurement precision
If pre-amplifiers and multiplexing are used to process signals from sensor arrays, then signal measurement capability is improved, but die area increases
Solution Approach 1:
The patent divides the biochip into multiple independent sensor cells, each containing its own integrating amplifier and trip flag logic. This segmentation allows parallel operation of multiple sensors without requiring centralized pre-amplification or multiplexing, thereby maintaining high signal detection capability while minimizing the total die area by eliminating shared signal processing infrastructure.
Solution Approach 2:
The patent transitions from sequential signal processing (multiplexing in time) to parallel processing by implementing independent integrating amplifiers in each sensor cell. This dimensional change from time-multiplexed to spatially-parallel architecture enables simultaneous signal integration across multiple sensors, improving detection capability without proportionally increasing die area.
3Measurement precision
If continuous signal integration is performed without autonomous termination, then measurement precision improves, but device complexity and power consumption increase
Solution Approach 1:
The trip flag mechanism implements a feedback loop where the integrated signal output is continuously monitored against a predetermined threshold. When the threshold is reached, the trip flag automatically toggles to terminate the integration cycle, creating a self-regulating system that maintains measurement precision without requiring external control circuits or continuous power consumption.
Data Source
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AI summary
A system for communicating information from an array of sensors is disclosed. The system comprises a sensor array that includes a plurality of sensors, wherein each sensor senses a physical property of a material that is in communication with the sensor. The system further comprises signal processing circuitry associated with each sensor that integrates the output of the sensor over time and compares the integrated output to a threshold. The system further comprises a communication network coupled to the signal processing circuitry that outputs information indicating that the integrated output corresponding to a given sensor has reached the threshold.