Digital RF Switch Matrix for Clock-Synchronous Signal Routing
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Solution Overview
Problem
Conventional RF switch matrices for multi-band, multi-channel communications systems are limited by high costs, inflexibility, and deficiencies in losses, isolation, crosstalk, and multicast capabilities, and lack the ability to route sampling clocks with data signals, which is essential for maintaining signal precision and linearity in digital-RF transceivers.
Innovation Solution
A non-blocking digital-RF switch matrix using ultrafast RSFQ superconducting logic elements that routes both data bits and sampling clocks, enabling dynamic reconfiguration and multicast capabilities, with digital-to-analog converters operating above Nyquist rates to maintain signal integrity across multiple RF bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional analog switch matrices are used for routing RF signals, then signal routing functionality is provided, but the system suffers from high costs, limited flexibility, high losses, poor isolation, crosstalk, and inability to multicast
Solution Approach 1:
The patent replaces conventional analog switching mechanisms with digital-RF switching based on superconducting logic elements. The digital switch matrix uses binary control signals to route RF channels, substituting analog switching hardware with a digitally-controlled system that operates in the digital domain while maintaining RF signal integrity through proper clock distribution.
Solution Approach 2:
The digital-RF switch matrix provides universal routing capability that can handle multiple RF bands and channels simultaneously. The same switch matrix architecture can be reconfigured via software to support different communication standards and frequency bands, providing multi-functionality that analog systems lack.
2Measurement precision
If digital-RF switching is implemented without distributing sampling clocks with data signals, then switching functionality is provided, but signal precision and linearity cannot be maintained
Solution Approach 1:
The patent merges the data signal path and clock signal path into a unified routing structure. Both the digital-RF data bits and their associated sampling clocks are routed together through the same switch matrix fabric, ensuring that precision timing information reaches the destination converter simultaneously with its corresponding data, thereby maintaining signal precision and linearity.
3Reliability
If analog components are used for band-specific processing, then performance within particular frequency bands is optimized, but the system becomes expensive and limited in flexibility
Solution Approach 1:
The patent implements dynamic reconfigurability where the switch matrix can be programmed in real-time to route different RF bands to appropriate digital signal processing units. This dynamic control allows the system to adapt to different frequency bands and communication standards without requiring dedicated analog components for each band, maintaining performance while enabling flexibility.
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 provides a flexible, efficient, and high-performance switch matrix that maintains signal precision and linearity, enabling efficient routing and reconfiguration of multi-GHz RF signals, supporting dynamic reconfiguration and multicast functions within digital-RF transceivers.
Implementation Method 1
ADCs with the requisite properties have recently been demonstrated, based on superconductor electronics using Josephson junctions, with circuit designs based on rapid-single-flux-quantum logic (RSFQ)
Data Source
AI summary
A system and method for transmitting a radio frequency signal, comprising providing a plurality of digital radio frequency signal inputs, each having a respective associated clock, wherein a respective digital radio frequency signal input has a digital data rate sufficient to represent both the information and carrier, if any, in a corresponding analog representation of the digital radio frequency signal; selectively controlled a non-blocking switch matrix with a control signal, the non-blocking switch matrix receiving the plurality of inputs and associated clocks, and producing a plurality of regenerated outputs and associated regenerated clocks; producing an analog representation of the radio frequency signal input with a respective digital to analog converter for each of the regenerated outputs and associated regenerated clocks; and communicating the analog representations from the respective digital to analog converters to a location for transmission thereat.