Selective Addressing Circuit for Sparse Single-Molecule Sensor Arrays
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Solution Overview
Problem
Current sequencing technologies face limitations in throughput, reagent and labor costs, and accuracy, particularly in real-time single molecule sequencing methods that rely on optical readouts, necessitating the development of non-optical alternatives for improved performance.
Innovation Solution
An integrated circuit with a substrate and sectors containing programmable switch controllers, nano-electronic measurement devices, and a sparse amplifier array architecture that enables real-time electronic detection of single molecules, allowing for efficient sequencing through electrical signals and selective addressing of active devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical readouts are used in real-time single molecule sequencing, then sequencing capability is achieved, but throughput is limited and costs are high
Solution Approach 1:
The patent replaces optical readout systems with electronic detection methods. Specifically, it uses field-effect transistors (FETs) and nanowire-based electronic sensors to detect single molecules, substituting the mechanical/optical detection system with an electronic one. This substitution enables higher throughput sequencing while reducing device complexity and cost, as electronic detection can be more easily scaled and integrated into high-density arrays.
Solution Approach 2:
The patent changes the detection parameter from optical signals to electrical signals. By measuring electrical properties (such as conductance changes) instead of optical properties, the system achieves higher throughput and lower costs. The electronic detection method allows for parallel processing of multiple molecules simultaneously, improving overall sequencing productivity.
2Measurement precision
If all measurement devices are densely arranged on the substrate, then detection coverage is maximized, but device complexity and addressing difficulty increase
Solution Approach 1:
The patent segments the measurement devices into sparsely distributed units across the substrate, organized in manageable groups or regions. Rather than creating a continuous dense array, the devices are strategically positioned with spacing between them. This segmentation reduces the complexity of addressing individual devices while maintaining sufficient detection coverage through the use of scan chains that can selectively activate specific device groups.
Solution Approach 2:
The patent introduces a temporal dimension to the addressing scheme by using scan chains that sequentially activate devices over time. Instead of requiring simultaneous control of all devices (which would be complex), the system uses time-multiplexed addressing where devices are activated in sequences. This dimensional approach to control simplifies the wiring and control logic while maintaining comprehensive detection capability.
3Device complexity
If sparsely arranged measurement devices are used, then device addressing is simplified, but detection coverage and sequencing efficiency decrease
Solution Approach 1:
The patent makes the scan chain addressing mechanism universal and multi-functional. The same scan chain infrastructure serves multiple purposes: it activates devices, routes signals, and enables selective addressing of sparsely distributed measurement devices. This universal addressing system maintains simplicity while supporting high sequencing efficiency by allowing flexible activation of any device subset without requiring complex dedicated control lines for each device.
Solution Approach 2:
The patent ensures continuous useful action by implementing overlapping scan chains and continuous device activation sequences. Rather than having idle periods between device activations, the system maintains continuous operation by piping signals through multiple devices in sequence. This continuous flow of signal activation maintains high sequencing efficiency despite the sparse physical arrangement of devices.
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 solution enhances sequencing efficiency and accuracy by reducing costs and improving throughput through real-time electronic detection and selective device addressing, overcoming the limitations of optical readouts in existing methods.
Implementation Method 1
Electronic detection of single molecules and single particles, including by capacitive, impedance, and conductive methods has been demonstrated
Implementation Method 2
Electronic detection of single molecules and single particles, including by capacitive, impedance, and conductive methods has been demonstrated
Implementation Method 3
Electronic detection of single molecules and single particles, including by capacitive, impedance, and conductive methods has been demonstrated
Data Source
Figure 1(A)~1(C)
Figure 2
Figure 3(A)~3(B)
AI summary
A circuit comprising a substrate with sectors on the substrate is provided, each sector comprising clock and data lines, a controller in electrical communication with the clock and data lines, a counter bias line, an amplifier input line and nano-electronic measurement devices on the substrate. A source of each device is coupled to the counter bias line and a drain of each device is coupled to the amplifier input line to obtain an electrical signal on the drain, the identity of which is determined by electrical interaction between the device and a charge label. Each device drain is gated by a corresponding switch between an on state, in which the drain is connected to the amplifier input line, and an off state, in which the drain is isolated from the amplifier input line. The controller controls switch states responsive to clock signal line pulses and data input line data.