Parasitic Capacitance Detection in Semiconductor Devices
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Solution Overview
Problem
The existing methods for estimating parasitic capacitance in semiconductor devices are inaccurate, leading to suboptimal optimization of switching speed and power consumption in digital circuits due to the dominance of parasitic capacitance effects as semiconductor manufacturing processes shrink.
Innovation Solution
A method involving a series of semiconductor devices with identical configurations except for wire length, where total capacitance values are measured to determine parasitic capacitance per unit length, allowing for precise calculation and optimization of parasitic capacitance in semiconductor devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If estimation method is used to obtain parasitic capacitance value, then the detection process is simple, but the measurement precision is low
Solution Approach 1:
The patent segments the total capacitance measurement into distinct components by creating test structures with controlled wire lengths. By measuring multiple devices with different wire lengths (0L, 1L, 2L, 3L) and subtracting the baseline capacitance, the parasitic capacitance component is isolated and calculated accurately through the formula: Cparasitic = (C1L - C0L) / L, where L is the wire length. This segmentation approach transforms a difficult direct measurement into a systematic differential measurement process.
2Productivity
If semiconductor manufacturing process is shrunk to accommodate more devices, then the productivity increases, but the parasitic capacitance effect worsens
Solution Approach 1:
The patent replaces physical modification of the semiconductor structure with an electrical measurement and calculation system. Instead of physically altering wire dimensions or device geometry to reduce parasitic capacitance, the invention uses electrical capacitance measurements combined with mathematical processing to quantify and compensate for the parasitic effect. The system substitutes physical structural changes with an informational processing approach that calculates parasitic capacitance values and enables software or circuit-level compensation.
3Measurement precision
If accurate parasitic capacitance detection is implemented, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent creates universal test structures that can be systematically applied across different device configurations. The same basic test structure design (with variable wire lengths) can be used for various semiconductor devices, making the measurement methodology universally applicable. The test structures serve multiple functions: they provide baseline capacitance measurement, enable parasitic capacitance extraction through differential measurement, and can be scaled to different wire lengths to accommodate different device geometries, thereby reducing the need for entirely different test structures for each device type.
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
This approach provides high accuracy in detecting parasitic capacitance, enabling effective optimization strategies that improve the performance of semiconductor devices by reducing parasitic capacitance effects.
Implementation Method 1
obtaining a total capacitance value of each of the plurality of semiconductor devices and the length of the wire in the each semiconductor device; determining a capacitance between the wire per unit length and the gate in the semiconductor device according to the plurality of total capacitance values and the lengths of the plurality of the wire
Data Source
AI summary
Provided are a parasitic capacitance detection method, a memory, and a readable storage medium, relating to the field of semiconductor technologies. The detection method comprises: providing a plurality of semiconductor devices for testing, all the semiconductor devices being the same in a number of sources, a number of drains, a number of active layers, a number of gates, a number of wires and a cross-sectional area of the wire, all the semiconductor devices being different in a length of the wire therein; determining a capacitance between the wire per unit length and the gate in the semiconductor device, the capacitance between the wire per unit length and the gate being considered as a parasitic capacitance per unit length; determining a corresponding wire length of a to-be-detected semiconductor device; and determining a parasitic capacitance of the to-be-detected semiconductor device.