Double-Gate Sensing Circuit for Threshold Drift Compensation
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Solution Overview
Problem
Sensing circuits face reduced detection sensitivity due to threshold drift in transistors, particularly when using transistors with small subthreshold swings, leading to instability in signal amplification capabilities.
Innovation Solution
A sensing circuit design incorporating a double-gate transistor with a bias compensation mechanism, utilizing a bias compensation circuit to stabilize the threshold voltage of the transistor by adjusting it back to an initial state through a second gate, maintaining the subthreshold region's stability and enhancing signal amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a transistor with small subthreshold swing is used to amplify sensing signals, then signal amplification capability is improved, but threshold voltage drift occurs leading to reduced detection sensitivity
Solution Approach 1:
The patent implements a feedback mechanism by introducing a second gate to the transistor and using a bias compensation circuit to sense and correct threshold voltage drift. The bias compensation circuit continuously monitors the transistor's threshold voltage and adjusts the bias voltage applied to the second gate to compensate for drift, thereby maintaining stable detection sensitivity while preserving the high signal amplification capability provided by the small subthreshold swing transistor.
Solution Approach 2:
The patent changes the electrical parameters of the transistor by introducing a controllable bias voltage to the second gate. This bias voltage is dynamically adjusted to compensate for threshold voltage drift, effectively modifying the transistor's operating parameters to maintain optimal performance. The bias compensation circuit generates adjustment signals that modify the gate voltage parameters, counteracting the threshold drift and preserving both amplification capability and detection sensitivity.
2Device complexity
If threshold voltage drift is not compensated, then device complexity remains low, but signal amplification stability deteriorates
Solution Approach 1:
The patent introduces a feedback-based bias compensation circuit that automatically detects and corrects threshold voltage drift in real-time. This feedback mechanism ensures stable signal amplification by continuously adjusting the bias voltage to the second gate based on the actual transistor state, maintaining amplification stability without requiring overly complex external compensation systems.
Solution Approach 2:
The transistor structure with dual gates enables self-compensation capability. The bias compensation circuit uses the transistor's own characteristics to generate the compensation signal, allowing the device to self-correct its threshold voltage drift without requiring external intervention or complex additional components. The system essentially serves itself by using internal signals to regulate its own performance.
Data Source
AI summary
Provided are a sensing circuit and a sensing method thereof, a sensor chip, and a display panel. The sensing circuit includes a first transistor including a first gate and a second gate, a first capacitor, a read circuit, and a bias compensation circuit. The first gate receives a sensing signal outputted by a sensor. The first capacitor is connected between the second gate and a first fixed potential signal terminal. The read circuit is connected between the first transistor and an output terminal of the sensing circuit. The bias compensation circuit is electrically connected to the first transistor and configured to input a bias voltage into the second gate of the first transistor. The bias voltage received by the second gate reduce the threshold voltage drift of the first transistor.