Self-Resetting Integrator-Differentiator for High-Speed Molecular Diagnostics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current molecular diagnostics face challenges with poor signal-to-noise ratios and limited temporal resolution due to noise constraints in electronic platforms, which hinder high-speed and high-dynamic-range measurements of single biomolecules.
Innovation Solution
The integration of resettable capacitors in a self-resetting continuous-time integrator-differentiator system, utilizing non-overlapping clock phases to manage charge balancing and prevent saturation, allowing for high-bandwidth and low-noise measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electronic acquisition circuits are used, then measurement bandwidth is maintained, but noise amplitude increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent segments the acquisition circuit into multiple parallel integrator channels, each handling a specific frequency band or time window. This segmentation allows independent optimization of each channel's integration time and noise filtering parameters, enabling high temporal resolution in some channels while maintaining low noise in others, thus resolving the contradiction between speed and measurement precision.
Solution Approach 2:
The patent implements periodic sampling and integration windows that synchronize with the expected signal characteristics. By using periodic action, the system can accumulate signal energy over multiple periods while rejecting aperiodic noise, achieving both high temporal resolution for event detection and low noise for precise measurement.
2Measurement precision
If integration time is increased to reduce noise, then noise amplitude decreases, but temporal resolution is sacrificed
Solution Approach 1:
The patent employs dynamic integration time adjustment where the integration window adapts based on signal characteristics and detection requirements. For transient events, shorter integration times preserve temporal resolution, while for steady-state signals, longer integration times reduce noise. This dynamic adaptation resolves the fixed trade-off between noise reduction and temporal resolution.
Solution Approach 2:
The system changes integration parameters (time constant, sampling rate, number of averages) based on the specific measurement conditions and signal type. By dynamically adjusting these parameters, the system can optimize for either low noise or high temporal resolution depending on the experimental requirements, eliminating the need to permanently sacrifice one for the other.
3Measurement precision
If discrete-time systems are used, then measurement performance improves, but bandwidth is reduced
Solution Approach 1:
The patent merges continuous-time filtering stages with discrete-time processing stages in a hybrid architecture. The continuous-time portion maintains high bandwidth by operating at the full signal rate, while the discrete-time portion provides precise measurement and noise reduction. This combination allows the system to achieve both high bandwidth and high measurement performance simultaneously.
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
This approach enables faster, cheaper, and higher-fidelity diagnostics by eliminating transient reset glitches, maintaining low noise levels, and preventing saturation, thus enabling sub-microsecond real-time tracking of single molecules and facilitating large-scale parallel sensing arrays for applications like DNA sequencing.
Implementation Method 1
integrating charge stored thereby on a first resettable capacitor of an integrator
Implementation Method 2
The first resettable capacitor is shorted with a first switch controlled by the first one of the plurality of clock phases to equalize the first integrated charge stored on the first resettable capacitor
Data Source
AI summary
A system for high-speed molecular diagnostics includes a self-resetting continuous-time integrator configured to integrate an input current on one of a plurality of integration capacitors to generate an integrated voltage. A self-resetting continuous-time differentiator is configured to differentiate the integrated voltage on one of a plurality of differentiating capacitors to generate an output voltage proportional to the input current. A fixed-threshold window comparator is configured to reset one of the plurality of integration capacitors, reset one of the plurality of differentiating capacitors, open a second one of the plurality of integration capacitors and open a second one of the plurality of differentiating capacitors in response to the integrated voltage exceeding a voltage range.