Single Pole Multi-Throw Switch Shared Terminals
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Solution Overview
Problem
Existing single-pole multi-throw switches require significant circuit area and suffer from parasitic capacitance issues, which weaken signal transmission and are not suitable for mobile electronic devices, especially when expanded to include more sets of selection switches.
Innovation Solution
The design incorporates a common terminal with multiple sets of selection switches, where primary and secondary transistors are coupled in series, allowing for efficient signal transmission through sharing primary transistors and optimizing transistor counts to reduce circuit area and parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sets of selection switches are included to provide more transmission paths, then the adaptability and versatility of the switch is improved, but the circuit area and device complexity increase significantly
Solution Approach 1:
The patent merges multiple sets of selection switches into a single integrated structure where multiple primary transistors share common terminals (source and drain). This consolidation allows multiple transmission paths to be achieved without proportionally increasing circuit area, as the shared terminals reduce redundant components.
Solution Approach 2:
The common source and drain terminals serve multiple functions by being shared across multiple primary transistors. This multi-functionality allows the same physical terminals to support multiple transmission paths, thereby increasing adaptability without proportional area increase.
2Adaptability or versatility
If multiple sets of selection switches are included to provide more transmission paths, then the adaptability and versatility of the switch is improved, but the parasitic capacitance increases and weakens signal transmission
Solution Approach 1:
By merging multiple primary transistors to share common source and drain terminals, the patent reduces the total number of discrete transistor instances. This reduction directly decreases the cumulative parasitic capacitance that would otherwise be present in separate, non-sharing transistor configurations.
Solution Approach 2:
The patent acknowledges that parasitic capacitance is inherent in transistor structures, but converts this potential harm into a manageable characteristic by optimizing the transistor configuration. The shared terminal structure is designed to minimize the impact of parasitic capacitance while maintaining the necessary number of transmission paths.
3Adaptability or versatility
If the number of selection switches is increased to expand functionality, then the adaptability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent merges multiple selection switch functions into a unified structure with shared terminals, reducing the total component count. This consolidation simplifies the manufacturing process by reducing the number of discrete components that need to be fabricated, assembled, and tested.
Solution Approach 2:
The universal design of the primary transistors with shared terminals allows a single structural template to serve multiple functions. This universality simplifies manufacturing by enabling repeated use of the same design pattern rather than requiring unique structures for each transmission path.
Data Source
AI summary
A single-pole multi-throw switch includes a set of selection switches. The set of selection switches includes a set of primary switches, a first set and a second set of secondary switches. The primary set of switches includes a plurality of primary transistors coupled in series for transmitting radio frequency signals. The first set of secondary switches is coupled to the primary set of switches and includes a plurality of first secondary transistors coupled in series for transmitting the radio frequency signals when the primary transistors and the first secondary transistors are turned on. The second set of secondary switches is coupled to the primary set of switches and includes a plurality of second secondary transistors coupled in series for transmitting the radio frequency signals when the primary transistors and the second secondary transistors are turned on.