RF Amplifier Attenuated Bypass Path for Power-Outage Links
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Solution Overview
Problem
IP-based communication networks, such as those used in cable television and VoIP services, face interruptions when RF signal amplifiers lose power, disrupting essential services like emergency communications due to the reliance on active devices that require a power feed.
Innovation Solution
Bi-directional RF signal amplifiers with a non-interruptible communications path that maintains signal transmission even during power outages by using a switching device and attenuator to reroute signals, ensuring continuous downstream and upstream communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If RF signal amplifiers use active devices that require power feed, then signal amplification performance is improved, but communication reliability during power interruptions deteriorates
Solution Approach 1:
The communication path is segmented into two separate paths: an active amplified path (first communications path) and a passive non-interruptible path (second communications path). The switching device divides the single communication path into these two segments, allowing the system to switch between them based on power availability. This segmentation resolves the contradiction by providing both high-performance amplification when powered and reliable communication when unpowered.
Solution Approach 2:
The system dynamically switches between the active amplified path and the passive non-interruptible path based on power status. The switching device changes the signal routing in real-time: using the amplified path when power is available and automatically switching to the passive path when power is interrupted. This dynamic adaptation resolves the contradiction by optimizing for amplification performance when possible and for reliability when necessary.
2Device complexity
If a single communication path is used, then device complexity is reduced, but the ability to maintain communication during power failures deteriorates
Solution Approach 1:
The second communications path (passive path) serves multiple functions: it acts as a backup communication path during power outages, provides signal attenuation functionality through the attenuator, and maintains impedance matching in the circuit. The switching device itself serves dual functionality by routing signals through different paths based on power status. This multi-functionality resolves the contradiction by adding reliability capabilities without proportionally increasing complexity.
3Manufacturing precision
If signal attenuation is applied during power interruptions, then impedance matching and signal quality are improved, but additional circuit components increase device complexity
Solution Approach 1:
The attenuator is merged with the second communications path in a way that the same attenuator component serves both as a signal attenuation device and as an impedance matching element. The passive components (resistors, capacitors, inductors) in the attenuator circuit provide both attenuation and impedance transformation functions simultaneously. This merging resolves the contradiction by achieving signal quality improvement without adding separate dedicated components for each function.
Data Source
AI summary
RF signal amplifiers are provided that include an RF input port, a switching device having an input that is coupled to the RF input port, a first output and a second output, a first diplexer having an input that is coupled to both the first output of the switching device and the second output of the switching device, and a first RF output port that is coupled to an output of the first diplexer. These amplifiers further include an attenuator that is coupled between the second output of the switching device and the input of the first diplexer.