Capacitive Sensing Transistor Layout for Stable Miniature Target Detection
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Solution Overview
Problem
Conventional semiconductor diagnostic devices face challenges with sub-optimal sensitivity due to unstable reference voltages and inability to individually detect different types of miniature targets, leading to signal interference and reduced versatility.
Innovation Solution
Implementing multiple voltage reference transistors around each sensing transistor, with varied material compositions and orientations, to stabilize voltage references and enhance sensitivity and specificity in detecting miniature targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor circuitry is used in test devices, then the device can perform basic detection functions, but the reference voltage becomes unstable and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent divides the single transistor function into separate sensing transistor and reference transistor components. The reference transistor is specifically designed to provide stable reference voltage while the sensing transistor detects signals, resolving the contradiction between voltage stability and signal precision by functional segmentation.
Solution Approach 2:
The patent applies different material compositions to different regions of the transistor structure. The sensing region uses materials optimized for signal detection while the reference region uses materials optimized for voltage stability, allowing each region to perform its specific function optimally without compromising the other.
2Adaptability or versatility
If conventional test devices are used, then they can detect miniature targets, but they cannot easily distinguish different types of miniature targets
Solution Approach 1:
The patent implements adjustable detection parameters including variable voltage thresholds and adjustable signal filtering that can be dynamically configured to detect different types of miniature targets. This dynamic adaptability allows the same device structure to distinguish multiple target types without requiring complex additional hardware.
Solution Approach 2:
The patent changes detection parameters such as voltage levels, signal thresholds, and filtering characteristics to differentiate between various types of miniature targets. By modulating these parameters, the device can selectively detect and distinguish different target types while maintaining a relatively simple overall structure.
3Measurement precision
If semiconductor circuitry is implemented in conventional test devices, then basic detection is possible, but sensitivity is reduced due to signal interference
Solution Approach 1:
The patent extracts the reference voltage generation function into a separate reference transistor that is electrically isolated from the signal detection path. This extraction removes the source of signal interference from the sensing circuitry, thereby improving detection sensitivity while maintaining the necessary voltage reference functionality.
Solution Approach 2:
The patent introduces differential signaling as an intermediary mechanism between the sensing transistor and the output circuitry. This differential approach acts as a mediator that rejects common-mode noise and interference while preserving the actual detection signal, thereby improving sensitivity without adding significant complexity.
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 provides a more stable voltage reference, improves signal-to-noise ratio, and enables individual detection of different types of miniature targets, enhancing the diagnostic device's sensitivity and accuracy.
Implementation Method 1
the sensing transistor is configured to detect, at least in part through capacitive coupling, a presence of one or more predefined miniature targets in the fluid
Data Source
AI summary
A substrate has a first side and a second side vertically opposite to the first side. A sensing transistor is disposed at least in part over the first side of the substrate. A plurality of voltage reference transistors is disposed at least in part over the first side of the substrate. The voltage reference transistors are disposed on different lateral sides of the sensing transistor. A structure is disposed over the second side of the substrate. The structure defines one or more openings configured to collect a fluid. A sensing film is disposed over the second side of the substrate, wherein the sensing transistor is configured to detect, at least in part through capacitive coupling, a presence of one or more predefined miniature targets in the fluid that attach to the sensing film in the opening that is vertically aligned with the sensing transistor.