Multi-Gate Sensing Transistors 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 with different material compositions and dimensions around each sensing transistor, providing a stable voltage reference and facilitating individual detection of various targets through capacitive coupling and impedance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor circuitry is used in diagnostic devices, then the device can detect miniature targets, but the reference voltage is unstable and signal-to-noise ratio is sub-optimal
Solution Approach 1:
The patent divides the reference voltage generation into multiple separate reference voltage transistors (first reference voltage transistor and second reference voltage transistor) rather than using a single conventional reference source. Each transistor provides an independent reference voltage path, which stabilizes the overall reference voltage and reduces noise coupling, thereby improving both reliability and measurement precision.
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 assigns different gate dielectric materials to different transistors in the circuit. The first reference voltage transistor has a first gate dielectric material while the second reference voltage transistor has a second gate dielectric material, and the sensing transistor has a third gate dielectric material. This local differentiation of material properties allows the device to create distinct electrical characteristics for different transistor types, enabling the system to distinguish between different types of miniature targets based on their unique electrical signatures.
3Productivity
If device geometry is scaled down to increase functional density, then production efficiency increases, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent employs multiple types of gate dielectric materials with different properties in the transistor structure. By using composite material approaches where different dielectric layers are deposited and patterned separately, the design achieves sophisticated electrical characteristics while maintaining compatibility with standard fabrication processes. This allows the device to benefit from scaling down for increased density while managing the precision challenges through careful material selection and process integration.
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
Enhances sensitivity and signal-to-noise ratio by stabilizing voltage references and reducing interference, enabling precise detection of multiple target types.
Implementation Method 1
The sensing transistor is configured to detect, at least in part through a capacitive coupling, a presence of the one or more predefined miniature targets in the fluid that attach to the sensing layer in the second opening
Implementation Method 2
The channel region of the sensing transistor may be configured to have an electrical impedance that is sensitive to the presence of the one or more predefined miniature targets in the second opening
Data Source
AI summary
A substrate has a first side and a second side opposite the first side. A first transistor has a first gate, a second transistor has a second gate, and a third transistor has a third gate. The first gate, the second gate, and the third gate are each disposed over the first side of the substrate. The second gate is disposed between the first gate and the third gate. The first gate and the third gate have different material compositions. A structure is disposed over the second side of the substrate. The structure includes a first opening aligned with the first transistor, a second opening aligned with the second transistor, and a third opening aligned with the third transistor. A sensing film is disposed over the second side of the substrate. The sensing film is configured to attach to one or more predefined miniature targets.