Integrated Capacitor Signal Detection Circuit for Accurate Voltage Division
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Solution Overview
Problem
Existing signal detection circuits for switching elements in gate drive circuits face challenges in improving detection accuracy while minimizing circuit size, particularly in suppressing surge voltages and controlling dV/dt during switching operations.
Innovation Solution
A signal detection circuit with a voltage dividing circuit comprising capacitors formed on the same semiconductor device, utilizing a multi-stage configuration and common centroid layout to reduce relative errors between capacitors, thereby enhancing detection accuracy and reducing circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage dividing circuit with capacitors is used to detect main terminal signals, then detection accuracy can be improved, but circuit size increases
Solution Approach 1:
The patent combines multiple capacitors (C1 and C2) into a single integrated voltage dividing circuit structure formed on the same semiconductor substrate. This merging approach maintains the voltage division function necessary for accurate detection while reducing the overall circuit footprint by eliminating separate discrete capacitor components and their associated external connections.
Solution Approach 2:
The patent transitions from using discrete external capacitors to forming capacitors directly on the semiconductor substrate in an integrated manner. This dimensional integration moves the capacitor functions from external three-dimensional components to planar two-dimensional structures on the chip, significantly reducing the circuit area while preserving detection accuracy.
2Measurement precision
If multiple capacitors are used in voltage dividing circuit, then detection accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The patent segments the voltage dividing function into multiple capacitor elements (C1 and C2) that are individually formed on the semiconductor substrate using separate formation regions. This segmentation allows each capacitor to be independently controlled and optimized during manufacturing, simplifying the overall fabrication process while maintaining accurate voltage division ratios for precise signal detection.
Solution Approach 2:
The patent controls the capacitance values of C1 and C2 by adjusting their physical dimensions (area and thickness) during the manufacturing process. By changing these geometric parameters, the desired voltage division ratio is achieved without complex assembly steps, thereby improving detection accuracy while maintaining ease of manufacture through standard semiconductor fabrication techniques.
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 proposed solution improves detection accuracy and reduces circuit size by minimizing voltage dividing errors and maintaining high breakdown voltages, while also improving frequency characteristics and manufacturing cost efficiency.
Implementation Method 1
a voltage dividing circuit 42 including a first capacitor C1 and a second capacitor C2
Data Source
AI summary
A signal detection circuit includes: a voltage dividing circuit having at least a first pair of voltage dividing capacitors connected in series for dividing an input voltage and configured to output a divided voltage, and a detection circuit configured to detect the divided voltage. The first pair of voltage dividing capacitors are included in one semiconductor device. The semiconductor device includes: (i) a semiconductor substrate, (ii) a first conductor layer, (iii) a first dielectric layer, (iv) a second conductor layer, (v) a second dielectric layer, (vi) a third conductor layer, and (vii) a short-circuit portion configured to short-circuit the first conductor layer and the semiconductor substrate.