High-Speed TDD Transceiver With Dynamic Impedance Switching
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Solution Overview
Problem
High-speed time division duplexing transceivers face challenges in reducing signal interference, requiring impedance matching, fast handover, and quick signal processing to efficiently utilize communication medium capacity, especially in high-throughput applications like 10 Gigabit per second over 15 m twist-pair cable.
Innovation Solution
A transceiver design incorporating a medium dependent interface for AC coupling, a broadband matching network for impedance matching, a programmable gain amplifier for signal amplification, an analog-to-digital converter for data conversion, and a digital-to-analog converter for current signal output, with logical signals asserted alternately to manage signal transmission and reception efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If TDD scheme is used to reduce signal interference, then interference between first signal and second signal is significantly eliminated, but guard interval overhead accounts for loss in efficiency of utilizing communication medium capacity
Solution Approach 1:
The patent eliminates the guard interval by implementing continuous transmission and reception operations. The transceiver switches between transmitting the first signal and receiving the second signal without interruption, removing the idle guard interval period and achieving continuous useful action to maximize communication medium utilization efficiency.
Solution Approach 2:
The patent employs dynamic impedance switching to adapt to different signal transmission modes. The impedance matching network dynamically adjusts impedance values based on whether the transceiver is transmitting or receiving, enabling fast handover between modes without requiring a guard interval, thus resolving the contradiction between interference reduction and efficiency.
2Object-affected harmful factors
If sharp filtering is applied in FDD scheme to mitigate interference, then interference between first signal and second signal is greatly reduced, but implementation difficulty increases due to need for sharp filter response with high cut-off frequency
Solution Approach 1:
The patent replaces the mechanical filtering approach of FDD with a time-domain switching approach. Instead of using complex sharp filters to separate frequencies, the system uses temporal separation with rapid impedance switching, substituting a simpler control mechanism for the complex filtering hardware.
Solution Approach 2:
The patent changes the operating parameters by switching impedance values dynamically rather than maintaining fixed frequency separation. This parameter change approach allows the system to achieve interference reduction through time-division multiplexing with impedance control, avoiding the need for complex frequency-selective filtering.
3Productivity
If FD scheme is used to maximize communication medium capacity utilization, then efficiency of utilizing communication medium is highly efficient, but strong interference between first signal and second signal makes implementation technically difficult
Solution Approach 1:
The patent implements periodic switching between transmission and reception modes with synchronized impedance changes. The transceiver alternates between transmitting the first signal and receiving the second signal in periodic cycles, with impedance switching synchronized to each mode change, enabling full-duplex-like efficiency while avoiding simultaneous interference.
4Productivity
If fast handover is implemented to reduce guard interval overhead, then efficiency of utilizing communication medium is improved, but impedance matching becomes more critical to prevent undesired reflection and interference
Solution Approach 1:
The patent implements preliminary impedance matching configuration before signal transmission or reception begins. The impedance matching network is pre-configured to the appropriate impedance value in advance of mode switching, ensuring that when the handover occurs, the impedance is already optimized, preventing reflection and interference while enabling fast transitions.
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
The solution effectively reduces signal interference, ensures fast handover, and enhances processing speed, thereby improving the efficiency and capacity utilization of the communication medium in high-speed time division duplexing systems.
Implementation Method 1
a medium dependent interface configured to provide AC (alternate current) coupling between a first voltage signal at a first node and a second voltage signal at a second node
Implementation Method 2
a broadband matching network configured to couple the second voltage signal at the second node to a third voltage signal at a third node
Data Source
AI summary
A transceiver includes a medium dependent interface configured to provide AC (alternate current) coupling between a first node and a second node; a broadband matching network 120 configured to couple the second node to a third node; a programmable gain amplifier configured to receive a third voltage signal at the third node and output a fourth voltage signal in accordance with a first logical signal; an analog-to-digital converter configured to receive the fourth voltage signal and output a first data in accordance with the first logical signal and a first clock; and a digital-to-analog converter configured to receive a second data and output a first current signal to the third node in accordance with a second logical signal and a second clock, wherein: the first logical signal and the second logical signal are asserted alternately.