PMOS Voltage Switch Circuit for High-Voltage Logic Process Compatibility
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Solution Overview
Problem
Conventional voltage switch circuits require a special logic circuit manufacturing process to handle high voltages, increasing complexity and cost due to incompatibility with standard logic circuit manufacturing processes.
Innovation Solution
A voltage switch circuit utilizing lightly-doped PMOS transistors that can withstand high voltage stress, compatible with standard logic circuit manufacturing processes, comprising specific configurations of PMOS and NMOS transistors and bias voltage controlling circuits to manage voltage drops and inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage switch circuits are used to handle high voltage stress, then high voltage capability is achieved, but manufacturing complexity and cost increase due to special logic circuit manufacturing process requirements
Solution Approach 1:
The patent changes the doping concentration parameter of PMOS transistors to create lightly-doped regions that can withstand high voltage stress. By adjusting the doping concentration to be lighter than conventional levels, the circuit achieves high voltage capability while remaining compatible with standard logic circuit manufacturing processes, thereby resolving the contradiction between reliability and manufacturing complexity
Solution Approach 2:
The invention makes the PMOS transistors serve dual functions: they operate as standard logic circuit elements during normal operation and simultaneously withstand high voltage stress when needed. This multi-functionality allows a single manufacturing process to produce circuits that handle both standard logic levels and high voltage conditions, eliminating the need for special manufacturing processes
2Reliability
If conventional voltage switch circuits are used to handle high voltage stress, then high voltage capability is achieved, but fabricating cost increases
Solution Approach 1:
By changing the doping concentration parameter to create lightly-doped PMOS transistors, the circuit achieves high voltage capability using standard manufacturing processes rather than requiring expensive specialized processes. This parameter change enables cost-effective production of high voltage capable circuits
Solution Approach 2:
The patent uses standard logic circuit manufacturing process copies that are already established in the industry, rather than developing new specialized processes. The lightly-doped PMOS structures are created using modified versions of existing standard processes, reducing fabrication costs while maintaining high voltage capability
3Reliability
If conventional voltage switch circuits are used to handle high voltage stress, then high voltage capability is achieved, but circuitry complexity increases
Solution Approach 1:
The patent simplifies circuitry by changing the transistor doping parameter rather than adding complex circuit structures. The lightly-doped PMOS transistors inherently provide high voltage capability through their physical properties, eliminating the need for additional protection circuits or complex voltage management logic that would increase circuitry complexity
Data Source
AI summary
A voltage switch circuit uses PMOS transistors to withstand high voltage stress. Consequently, the NMOS transistors are not subject to high voltage stress. The lightly-doped PMOS transistors are compatible with a logic circuit manufacturing process. Consequently, the voltage switch circuit may be produced by a logic circuit manufacturing process.