Wireless Transceiver Circuit With Self-Switched TDD Isolation
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Solution Overview
Problem
Wireless transceiver circuits operating in time division duplexing mode face challenges with poor isolation and operational difficulties due to lack of control signals to switch between transmitter and receiver paths, especially when sharing the same or partially overlapping frequency bands, leading to signal leakage and communication issues.
Innovation Solution
A wireless transceiver circuit with a detection circuit that automatically switches between Tx and Rx paths based on detected signal power levels, using directional couplers and RF isolators to provide isolation without external control signals, ensuring operation under TDD mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a control signal from an external controller is used to switch between Tx and Rx modes, then the transceiver can operate in TDD mode, but the device complexity increases and external control signals are required
Solution Approach 1:
The detection circuit automatically detects the presence of Tx signal and autonomously controls the switching between Tx and Rx modes without requiring external controller intervention. The circuit serves itself by using its own detected signal to generate the control action, eliminating the need for external supervision.
Solution Approach 2:
The detection circuit continuously monitors the Tx signal presence and feeds this information back to control the switching mechanism. This closed-loop feedback enables automatic mode switching based on real-time signal detection, allowing TDD operation without external control signals.
2Productivity
If the Tx and Rx paths operate simultaneously on the same frequency, then the transceiver can function without mode switching, but signal leakage from Tx to Rx path occurs
Solution Approach 1:
The transceiver operates in periodic intervals, alternating between Tx mode and Rx mode based on detected signal presence. This time-division approach prevents simultaneous operation on the same frequency, thereby eliminating signal leakage while maintaining continuous communication functionality.
Solution Approach 2:
The detection circuit acts as an intermediary that monitors Tx signal presence and mediates the switching between Tx and Rx paths. This intermediary controls the isolation mechanism to prevent signal leakage by ensuring only one path is active at a time on the same frequency.
3Extent of automation
If additional circuit components are added to enable automatic switching, then the transceiver can operate without external control, but the device complexity increases
Solution Approach 1:
The detection circuit uses the existing Tx signal within the system to automatically control the switching between modes. By leveraging the system's own operational signal for control purposes, the circuit achieves automation without requiring complex external control mechanisms.
Solution Approach 2:
The detection circuit serves multiple functions: it detects Tx signal presence, determines communication direction, and generates control signals for mode switching. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances signal isolation and improves communication efficiency by automatically switching paths based on signal power, reducing signal leakage and enhancing RF communication coverage.
Implementation Method 1
a detection circuit connected between the Tx path circuit and the third port of the first waveguide and configured to detect the Tx signal so as to turn on or turn off the Rx path circuit in response to the Tx signal having been detected
Implementation Method 2
a first waveguide including a first port configured to transmit a Tx signal and to receive a Rx signal, a second port configured to receive the Rx signal from the first port, and a third port configured to transmit the Tx signal to the first port
Implementation Method 3
a low noise amplifier for amplifying the power as well as minimizing the noise figure of the received Rx signal
Implementation Method 4
a power amplifier which boosts the Tx signal for long distance transmission
Data Source
AI summary
The disclosure is directed to a wireless transceiver circuit which includes not limited to: a first waveguide including a first port configured to transmit a Tx signal and to receive a Rx signal, a second port configured to receive the Rx signal from the first port, and a third port configured to transmit the Tx signal to the first port, a Rx path circuit connected to the second port of the first waveguide and configured to receive the Rx signal, a Tx path circuit configured to receive a pre-amplified signal to generate the Tx signal from the pre-amplified signal, and a detection circuit connected between the Tx path circuit and the third port of the first waveguide and configured to detect the Tx signal to turn on or turn off the Rx path circuit. The Tx signal and the Rx signal operate under TDD on a same frequency spectrum.