Level Shifter Transistor Layout for Fast Voltage-Domain Switching
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Solution Overview
Problem
Existing electronic circuits with level shifters struggle to transmit signals quickly and reliably between different voltage domains.
Innovation Solution
The electronic circuit incorporates a level shifter transistor with a load path coupled between a low-side reference node and a high-side supply node, integrated in a semiconductor body with a base region, tub, and device region of specific doping types, allowing for efficient signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional level shifter is used to transmit signals between different voltage domains, then signal transmission between voltage domains is achieved, but the signal transmission speed is slow and reliability is poor
Solution Approach 1:
The level shifter is divided into two independent transistors (first level shifter transistor and second level shifter transistor) with separate load paths. Each transistor handles one polarity of the signal independently, allowing simultaneous operation and faster signal transmission while maintaining reliability through redundancy and isolation of failure modes.
Solution Approach 2:
Both level shifter transistors are integrated into a single semiconductor body with shared structural components (base region, tub, device region). This merging provides electrical isolation through the tub structure while enabling compact integration and simultaneous operation, achieving both speed and reliability.
2Speed
If a level shifter transistor is integrated in a semiconductor body with base region, tub, and device region, then switching speed is improved, but device complexity increases
Solution Approach 1:
The tub structure serves multiple functions: it provides electrical isolation between the first and second level shifter transistors, defines the device region boundaries, and enables the complementary doping type configuration. This multi-functionality reduces the need for additional isolation structures and simplifies the overall device architecture while maintaining high switching speed.
Solution Approach 2:
The semiconductor body uses different doping types in specific regions (base region of first doping type, tub of second doping type, device region of first doping type). This localized doping strategy creates optimal electrical characteristics for fast switching in each region while maintaining a relatively simple overall structure that can be manufactured using standard semiconductor processes.
Data Source
AI summary
An electronic circuit and an integrated circuit are disclosed. The electronic circuit includes: a level shifter including a level shifter transistor having a load path coupled between a low-side reference node and a high-side supply node of the electronic circuit. The electronic circuit further includes a semiconductor body having a base region of a first doping type, a tub of a second doping type complementary to the first doping type, and a device region of the first doping separated from the base region by the tub. The level shifter transistor is at least partially integrated in the device region, and the tub is connected to the high-side supply node and the base region is connected to the low-side reference node.