Miniature Target Sensor Layout With Distributed Voltage References
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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, allowing for individual detection of different 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 sensing transistor into multiple sensing transistors (first sensing transistor and second sensing transistor) with different orientations. Each sensing transistor is paired with dedicated voltage reference transistors, creating separate detection channels that can independently measure different components of the signal, thereby improving reference voltage stability and signal-to-noise ratio through distributed measurement.
Solution Approach 2:
The patent implements voltage reference transistors with specific material compositions (e.g., silicon-germanium) in localized regions around each sensing transistor. The gate dielectric layers have varying thicknesses (e.g., 5nm to 20nm) in different areas to optimize capacitive coupling locally. This local optimization of material properties enhances the stability and precision of voltage references at each sensing location.
2Adaptability or versatility
If conventional test devices use single sensing transistor, then device structure remains simple, but ability to distinguish different types of miniature targets is limited
Solution Approach 1:
The patent segments the sensing function into multiple transistors oriented in different directions (e.g., first sensing transistor oriented in first direction, second sensing transistor oriented in second direction). Each transistor detects miniature targets from its specific orientation, enabling the system to distinguish between targets based on their spatial distribution and characteristics, thereby improving target differentiation capability.
Solution Approach 2:
The patent adds a spatial dimension to the detection capability by orienting sensing transistors in multiple directions (e.g., perpendicular orientations). This dimensional approach allows the device to detect not only the presence but also the orientation and spatial arrangement of miniature targets, enhancing versatility without requiring complex multi-functional components.
3Reliability
If voltage reference transistors are placed around sensing transistor in multiple directions, then voltage reference stability improves, but device area increases
Solution Approach 1:
The patent places voltage reference transistors in a nested configuration around the sensing transistor, with first voltage reference transistor and second voltage reference transistor positioned in different directions relative to the central sensing transistor. This nested arrangement allows multiple reference transistors to occupy compact space while maintaining their directional relationships, improving voltage reference stability without proportionally increasing device footprint.
Solution Approach 2:
The patent combines multiple voltage reference transistors and sensing transistors into an integrated structure where they share common substrates and interconnect layers. The voltage reference transistors are merged with the sensing transistor in a compact arrangement, allowing the system to achieve improved reference stability through multiple transistors while minimizing the overall area occupied by sharing structural elements.
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 sensitivity, and reduces signal interference, enabling accurate and versatile detection of various miniature targets.
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.