CMOS Biosensor Integration for Noise Reduction and Compact Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current biosensor systems face challenges in accuracy due to probabilistic analyte capturing and non-specific binding, leading to noise interference, and have not transitioned effectively to portable, compact point-of-care devices due to bulky detection platforms and integration limitations with detector and readout circuitry.
Innovation Solution
Incorporating CMOS integrated circuits into biosensor systems, utilizing a silicon substrate with active devices, metal layers, and a passivation layer with exposed sensing electrodes, along with optically coupling capturing probes to CMOS detectors for improved signal detection and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional biosensor systems use probabilistic analyte capturing and non-specific binding detection, then they can detect target analytes, but accuracy deteriorates due to noise interference and binding uncertainty
Solution Approach 1:
The patent replaces traditional optical detection systems with CMOS-based electronic detection systems. The optical scanner and readout circuitry are substituted with integrated CMOS circuits that directly detect signals from the sensing electrodes, eliminating the noise introduced by optical components and enabling more precise measurement of binding events.
Solution Approach 2:
The patent introduces CMOS integrated circuits as an intermediary between the biological sensing elements and the detection system. The CMOS circuits process signals from the sensing electrodes, amplifying and filtering them to reduce noise interference and improve measurement precision of the binding events.
2Reliability
If biosensor systems use bulky detection platforms, then they can provide adequate detection capability, but portability deteriorates due to size constraints for point-of-care devices
Solution Approach 1:
The patent merges the detection platform, readout circuitry, and signal processing functions into a single integrated CMOS chip. This consolidation eliminates the need for separate bulky components, enabling the development of compact point-of-care devices while maintaining reliable detection capability.
Solution Approach 2:
The CMOS integrated circuit serves multiple functions simultaneously: it acts as the detector, signal amplifier, noise filter, and data processor. This multi-functionality reduces the overall device volume while maintaining adequate detection capability for point-of-care applications.
3Volume of moving object
If biosensor systems integrate detector and readout circuitry, then device compactness improves, but manufacturing complexity increases due to integration challenges
Solution Approach 1:
The patent uses CMOS fabrication technology to replace complex mechanical integration of separate detector and readout components. The standardized CMOS manufacturing process simplifies the integration of multiple functions into a single chip, reducing integration complexity compared to assembling separate bulky components.
4Productivity
If biosensor systems use conventional detection methods, then they can detect analytes, but productivity deteriorates due to inability to perform real-time high-throughput screening
Solution Approach 1:
The patent replaces slow optical scanning methods with parallel electronic readout using CMOS circuits. Multiple sensing electrodes can be read simultaneously through the integrated circuit architecture, enabling real-time high-throughput screening and significantly improving detection productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances biosensor accuracy and enables the development of compact, high-performance, and cost-efficient systems capable of real-time detection and high-throughput molecular screening, addressing the limitations of existing biosensors by integrating CMOS technology for robust and flexible design.
Implementation Method 1
the passivation layer comprises an opening configured to expose the top metal layer, where the opening is used as a sensing electrode
Implementation Method 2
the target analytes in the sample volume first need to collide with the capturing layer, interact and bind to the probes
Data Source
AI summary
A biosensor system incorporating CMOS integrated circuits. In one type of biosensor system, the biosensor system includes a silicon substrate. The biosensor system further includes active devices fabricated on the silicon substrate. Additionally, the biosensor system includes a plurality of metal layers stacked on top of the active devices. Furthermore, the biosensor system includes a passivation layer covering a top metal layer, where the passivation layer includes an opening configured to expose the top metal layer, where the opening is used as a sensing electrode. Additionally, the biosensor system includes a plurality of probes attached to the sensing electrode.