Shielded Sensing Voltage Line Layout for Noise-Stable Semiconductor Circuits
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Solution Overview
Problem
Semiconductor devices face instability in sensing voltage levels due to noise immunity issues, leading to unreliable operation and potential functional errors, particularly as cell sizes decrease and operating voltages lower.
Innovation Solution
A semiconductor device is designed with a sensing voltage line shielded by a first internal voltage line, which has high noise immunity, stabilizing the sensing voltage and the generated internal voltages, thereby improving reliability without increasing wiring complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensing voltage line is used to detect ground node voltage for compensation, then the voltage driver can compensate for ground node voltage rise, but the sensing voltage line has poor noise immunity causing unstable sensing voltage levels
Solution Approach 1:
A shield line is introduced as an intermediary element between the sensing voltage line and external noise sources. The shield line acts as a mediator that intercepts and redirects electromagnetic interference away from the sensing voltage line, protecting the weak sensing signal without requiring changes to the sensing voltage line itself.
Solution Approach 2:
The shield line converts harmful electromagnetic noise into a controlled shielding effect. By placing the shield line adjacent to the sensing voltage line, the noise that would otherwise directly affect the sensing voltage is instead captured and redirected to ground through the shield line's connection, transforming the harmful interference into a protective mechanism.
2Object-affected harmful factors
If a shield line is added to protect the sensing voltage line from noise, then noise immunity is improved, but wiring complexity increases
Solution Approach 1:
The shield line is merged with existing ground voltage lines in the semiconductor device. Instead of creating entirely new wiring paths, the shield line utilizes the existing ground infrastructure, connecting to ground at multiple points along its length. This approach provides effective shielding while minimizing additional wiring complexity by reusing existing ground pathways.
3Productivity
If cell size is decreased to increase integration density, then more circuits can be integrated, but sensing voltage becomes more susceptible to noise and instability
Solution Approach 1:
The shield line is positioned and configured in advance during device design and fabrication to preemptively counteract noise interference. By establishing the shield line's position and grounding connections before the device operates, the design proactively prevents noise from coupling onto the sensing voltage line, rather than attempting to correct noise issues after they occur during operation.
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 solution stabilizes sensing voltage levels and generated internal voltages, preventing functional errors and enhancing reliability by shielding the sensing voltage line with a noise-immune internal voltage line.
Implementation Method 1
a first internal voltage line disposed between the first circuit area and the second circuit area, and configured to transfer an internal voltage, generated by a voltage driver of the first circuit area using the sensing voltage provided through the sensing voltage line, to the second circuit area and shield the sensing voltage line
Data Source
AI summary
A semiconductor device includes a sensing voltage line disposed between a first circuit area and a second circuit area, and configured to transfer a sensing voltage detected in the second circuit area to the first circuit area; and a first internal voltage line disposed between the first circuit area and the second circuit area, configured to transfer an internal voltage, generated by a voltage driver of the first circuit area using the sensing voltage provided through the sensing voltage line, to the second circuit area and configured to shield the sensing voltage line.