Semiconductor Switch Layout for Correlated Transistor Voltages
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Solution Overview
Problem
Existing semiconductor switch circuits for wireless devices face challenges in maintaining operational reliability due to variations in transistor withstand voltages and threshold voltages, which can lead to breakage and reduced performance.
Innovation Solution
The semiconductor device incorporates transistors with the same finger pitch, length, and width for both switching and feedback circuits, with feedback transistors interposed between switching transistors to ensure correlated withstand and threshold voltages, preventing breakage and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors with different dimensions are used in switching and feedback circuits, then circuit functionality is achieved, but voltage variations cause reliability degradation
Solution Approach 1:
The patent applies parameter changes by standardizing the physical dimensions (finger pitch, length, and width) of transistors used in both switching circuits and feedback circuits. This uniformity in transistor parameters ensures consistent electrical characteristics, particularly withstand voltage and threshold voltage, across different circuit functions. By controlling these parameters to be equal, the patent eliminates voltage variations that would otherwise degrade reliability, thus resolving the contradiction between achieving circuit functionality and maintaining voltage consistency.
2Adaptability or versatility
If transistor dimensions vary between switching and feedback circuits, then circuit design flexibility is maintained, but withstand voltage and threshold voltage become uncorrelated leading to breakage
Solution Approach 1:
The patent applies homogeneity by using transistors with identical finger pitch, length, and width in both switching circuits and feedback circuits. This homogeneous approach ensures that all transistors, regardless of their functional role, have correlated electrical characteristics including withstand voltage and threshold voltage. The homogeneity in transistor dimensions prevents the uncorrelation of voltage parameters that would lead to circuit breakage, while still allowing design flexibility through the uniform building block approach.
3Ease of manufacture
If standard transistor configurations are used, then manufacturing is simplified, but voltage variations reduce operational reliability
Solution Approach 1:
The patent applies parameter changes by imposing strict uniformity requirements on transistor dimensions (finger pitch, length, and width) across all transistor instances in the circuit. This standardized parameter approach simplifies manufacturing by reducing the variety of transistor specifications that must be controlled, while simultaneously improving reliability by eliminating voltage variations. The parameter standardization creates a manufacturable solution that achieves both ease of fabrication and high operational reliability.
Data Source
AI summary
According to one embodiment, a semiconductor device includes a plurality of transistors. The transistors are coupled through serial coupling. The transistors include a first transistor and a second transistor. The semiconductor device further includes a third transistor and a first diode. The second transistor includes a first sub-transistor and a second sub-transistor that are coupled in parallel with each other. The first transistor, the first sub-transistor, the second sub-transistor, the third transistor, and the first diode are arranged on a substrate, with the third transistor interposed between the first sub-transistor and the second sub-transistor in a first direction.