Antenna Switch Transistor Control for TDD FDD Mode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Antenna switches configured with multiple transistors can experience mismatching and signal distortion or damage due to sudden high electrical currents, leading to transistor breakdowns.
Innovation Solution
The method involves controlling the activation of transistors in electronic devices to switch off those connected to electrical paths other than the time division duplexer (TDD) path, selectively activating first and second transistors in each path based on the selection between TDD and frequency division duplexer (FDD) modes to manage power and prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple transistors are engaged in parallel electrical paths to handle high electrical current, then power handling capability is improved, but transistor breakdown risk increases due to sudden high current
Solution Approach 1:
The control circuit preemptively identifies sudden high electrical current conditions and switches off transistors in parallel electrical paths before the current can cause breakdown. This preliminary protective action prevents the harmful effect while maintaining power handling capability when needed.
Solution Approach 2:
The harmful transistors (those in parallel paths that could cause mismatching under sudden current) are extracted or switched off from the active circuit configuration. By removing these potentially harmful components from the current path, the system protects against breakdown while maintaining necessary power handling through the TDD path.
2Adaptability or versatility
If transistors in parallel electrical paths are kept active to maintain signal routing flexibility, then adaptability is improved, but antenna mismatching occurs leading to signal distortion
Solution Approach 1:
The control circuit preemptively switches off transistors in parallel electrical paths when TDD mode is detected, preventing antenna mismatching before it occurs. This maintains signal routing flexibility by keeping the TDD path active while removing only the harmful parallel path connections.
Solution Approach 2:
Different transistor configurations are applied to different electrical paths based on the operating mode. The TDD path maintains full transistor activation for flexibility, while parallel paths have transistors switched off to prevent mismatching. This localized differentiation resolves the contradiction between adaptability and harmful effects.
3Adaptability or versatility
If all transistors are activated to handle various frequency bands, then adaptability is improved, but power consumption increases
Solution Approach 1:
The control circuit periodically monitors the operating mode (TDD or FDD) and dynamically adjusts transistor activation states accordingly. In TDD mode, parallel path transistors are switched off to save power; in FDD mode, they remain active for frequency band support. This periodic adaptation resolves the power-consumption contradiction.
Solution Approach 2:
The transistor activation configuration is made dynamic rather than static. The control circuit continuously adapts the transistor states based on real-time mode detection, enabling the system to optimize power consumption while maintaining frequency band adaptability when needed.
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing; a communication circuit in the housing and configured to generate a signal for a time division duplexer (TDD) and a frequency division duplexer (FDD); an antenna electrically connected with the communication circuit; a plurality of electrical paths; and a control circuit, wherein each electrical path comprises a first transistor configured to connect with each electrical path in series, and a second transistor configured to connect with each electrical path and a ground, wherein the control circuit is configured to receive a wireless signal, select at least one of the TDD and the FDD to transmit the received wireless signal, and selectively activate a first transistor and a second transistor disposed in at least one electrical path and first and second transistors disposed in at least another electrical path among the plurality of electrical paths based on the selection.