RF Front End Circuit TDD Signal Isolation
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Solution Overview
Problem
Wireless transceiver circuits face challenges in operating under time domain duplexing (TDD) mode, where the transmitter and receiver often share the same or overlapping frequency bands, leading to poor isolation and operational difficulties due to the lack of control signals to switch between transmission and reception paths.
Innovation Solution
Incorporating a detection circuit with switches and an adjustable amplifier circuit to automatically detect transmitting signals and switch between paths, enabling the transmission path and disabling the reception path when a signal is detected, thereby providing isolation without external control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmitter and receiver operate on the same or overlapping frequency band in TDD mode, then the wireless signal boosting device can operate in time domain duplexing mode, but the isolation between Tx path and Rx path deteriorates leading to signal leakage
Solution Approach 1:
The patent implements dynamic switching between transmission and reception paths using detection circuits that automatically control switches to enable the active path (Tx or Rx) based on signal detection. This dynamic path switching ensures that only one path is active at a time, preventing signal leakage while maintaining TDD mode operation flexibility.
Solution Approach 2:
The detection circuit acts as an intermediary between the transmitter and receiver paths, detecting the presence of transmitting signals and automatically controlling the switches to isolate the inactive path. This intermediary mechanism provides automatic isolation without requiring external control signals, resolving the contradiction between TDD adaptability and signal leakage prevention.
2Object-affected harmful factors
If external control signals are used to switch between Tx and Rx paths, then the isolation between paths can be improved, but the device complexity increases due to requiring controllers such as MCU or CPU
Solution Approach 1:
The detection circuit performs self-service by automatically detecting transmitting signals and controlling the switches without requiring external control signals from MCUs or CPUs. The circuit autonomously manages the isolation between Tx and Rx paths, achieving path switching functionality while eliminating the need for additional controller components, thus reducing device complexity.
3Ease of operation
If additional circuit components are added to provide control signals for path switching, then the operational control can be improved, but the device complexity and cost increase
Solution Approach 1:
The detection circuit provides self-service by generating its own control signals based on signal detection, eliminating the need for external controllers or additional circuit components. The automatic detection and switching mechanism achieves ease of operation while minimizing device complexity through integration.
Solution Approach 2:
The detection circuit serves multiple functions: detecting transmitting signals, determining transmission mode, and controlling path switching. This multi-functionality consolidates what would otherwise require separate control components, improving ease of operation while avoiding increases in device complexity.
Data Source
AI summary
A wireless RF front end circuit and a wireless signal boosting device are provided. The wireless RF front end circuit includes a first switch, a second switch, an adjustable amplifier circuit, and a detection circuit. The second switch is electrically connected to the first switch through a first path or a second path. The adjustable amplifier circuit is disposed in the first path between the first switch and the second switch. The detection circuit is electrically connected to the first switch and the second switch and configured to detect a transmitting signal, wherein the detection circuit configures the first switch and the second switch to enable the first path and disable the second path in response to the transmitting signal has been detected.