Ultrasonic Detection Circuit With Bootstrap Threshold Compensation
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Solution Overview
Problem
Traditional ultrasonic imaging technologies face challenges in achieving high resolution and accuracy due to variations in threshold voltage of transistors, leading to distorted signal collection and detection errors in large-area two-dimensional array elements.
Innovation Solution
An ultrasonic detection circuit with a reset module, acquisition module, drive transistor, storage module, compensation module, and reading module, which includes a bootstrap mechanism to stabilize the gate-source voltage difference, eliminating the influence of threshold voltage variations by incorporating a storage capacitor and control signal generation module to reduce detection errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ultrasonic imaging technology is used, then the basic detection function is achieved, but the detection accuracy and resolution deteriorate due to threshold voltage variations in transistors
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual threshold voltage of each transistor and using this information to compensate for signal distortions. The system continuously monitors and adjusts based on the measured threshold voltage variations, thereby maintaining detection accuracy despite transistor parameter variations.
Solution Approach 2:
The patent changes the operating parameters of the ultrasonic detection circuit by dynamically adjusting voltage levels and timing parameters based on the measured transistor threshold voltages. This parameter adaptation allows the circuit to compensate for manufacturing variations and maintain consistent performance across different transistors in the array.
2Manufacturing precision
If transistor threshold voltage variations are present, then device manufacturing is simplified, but detection precision deteriorates due to distorted signal collection
Solution Approach 1:
The system measures the actual threshold voltage of each transistor and uses this feedback information to compensate for signal distortions. This allows the system to accept manufacturing variations while maintaining detection precision through active compensation based on measured parameters.
Solution Approach 2:
The patent performs preliminary measurement of transistor threshold voltages before signal acquisition. By characterizing the transistor properties in advance, the system can pre-compensate for potential signal distortions, ensuring accurate detection from the outset without requiring complex real-time adjustments.
3Measurement precision
If a compensation mechanism is added to correct threshold voltage effects, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent designs the compensation circuit to serve multiple functions: it measures threshold voltages, stores compensation data, and actively compensates for signal distortions. By making the compensation mechanism multi-functional, the system reduces overall device complexity while maintaining high detection accuracy through integrated operations.
Solution Approach 2:
The compensation circuit is designed to automatically measure and compensate for threshold voltage variations without external intervention. The system self-calibrates by monitoring its own transistor characteristics and adjusting signals accordingly, eliminating the need for complex external calibration equipment and reducing operational complexity.
Data Source
AI summary
An ultrasonic detection circuit includes a reset module, an acquisition module, a drive transistor, a storage module, a compensation module and a reading module; wherein the reset module is respectively connected to a reset control end, a reset signal end and a first node; the acquisition module is connected to an acquisition control end, an ultrasonic sensor and the first node; the drive transistor and the control electrode are connected to the first node, the first electrode is connected to the compensation module, and the second electrode is connected to the second node; the storage module is respectively connected to the first node and the second node; the compensation module is also connected to a compensation control end and a first voltage end; and the reading module is respectively connected to a read control end, the second node and an output end.