Switch Circuit for Mobile Devices with Hierarchical Signal Separation
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Solution Overview
Problem
Existing switch circuits for mobile devices face challenges in efficiently handling high-frequency signals and analog audio signals due to the need for a common terminal that balances low on-resistance for audio transistors and small load capacity for high-frequency signal switching, leading to signal distortion and quality degradation.
Innovation Solution
A switch circuit design that separates high-frequency and audio signal lines using hierarchical switches, where high-frequency signals are managed by a dedicated high-frequency switch and audio signals by a series of audio switches, with the capacity of audio switches in secondary positions not affecting the load on high-frequency signals, thus maintaining signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a common terminal is used for both USB and headphone terminals, then device downsizing is achieved, but high-frequency signals become susceptible to distortion due to transistor switch capacity
Solution Approach 1:
The patent divides the switching function into two separate switch circuits: a first switch circuit for USB high-frequency signals and a second switch circuit for headphone audio signals. This segmentation allows each circuit to be optimized independently, preventing the audio signal transistor capacity from distorting USB high-frequency signals while maintaining device downsizing through shared terminal infrastructure.
2Manufacturing precision
If a large transistor is used for audio signal switching to achieve low on-resistance, then audio signal quality is improved, but load capacity increases causing distortion of high-frequency signals
Solution Approach 1:
The patent separates the audio signal switching function into a dedicated second switch circuit with large transistors optimized for low on-resistance, while the first switch circuit for USB signals uses smaller transistors with lower capacity. This prevents the audio switch's large capacity from loading and distorting high-frequency USB signals.
Solution Approach 2:
The patent introduces a terminal switching mechanism that acts as an intermediary, selectively connecting either the USB terminal or headphone terminal to the common terminal. When USB high-frequency signals are transmitted, the audio signal path is disconnected, preventing the large-capacity audio transistor from affecting USB signal quality.
3Adaptability or versatility
If multiple audio signal lines are branched from USB signal line, then audio functionality is enhanced, but distortion of high-frequency signals increases
Solution Approach 1:
The patent implements a hierarchical switching architecture where the first switch circuit handles USB high-frequency signals with minimal branching, and the second switch circuit handles audio signal distribution to multiple destinations. This segmentation ensures that multiple audio signal lines do not increase the load capacity seen by USB high-frequency signals, preventing distortion.
Solution Approach 2:
The patent organizes switch circuits in a hierarchical structure with the USB switch circuit at the primary level and audio switch circuits at secondary levels. This dimensional organization allows audio signals to be branched to multiple destinations without affecting the USB signal path, as the audio branching occurs in a separate hierarchical dimension.
Data Source
AI summary
A signal line from a common terminal, which allows the insertion of a terminal of a cable for transmitting high-frequency signals or the insertion of a terminal of a cable dedicated to the transmission of audio signals, is branched into one line which is connected to one end of a high-frequency signal switch (USB switch) and the other line which is connected to one end of an audio signal switch (audio switch), respectively. A signal line from the other end of the high-frequency signal switch is connected to a target circuit. A signal line from the other end of the audio signal switch in a primary hierarchical position is branched into a plurality of lines, and the respective plurality of lines are connected to one end of audio signal switches (e.g., headphone switch and microphone switch) in a secondary hierarchical position. And the respective signal lines from the other end of the plurality of audio signal switches of secondary hierarchical position are connected to respective target circuits.