Band-Switch Demultiplexing Circuit With Phase Isolation
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Solution Overview
Problem
As the number of communication bands increases, the number of selection target terminals in existing demultiplexing circuits also increases, leading to degraded transmission characteristics and a complex control system due to parasitic capacitance, which affects the performance of high-frequency signal transmission.
Innovation Solution
A demultiplexing circuit configuration that includes a shared connection end, signal ends for individual communication bands, a band switch with a reduced number of selection target terminals, and phase adjustment circuits that secure isolation between communication bands, allowing high-frequency signals to be transmitted with low loss without passing through the band switch, thereby reducing conductor width and transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of selection target terminals is increased to support more communication bands, then the adaptability of the demultiplexing circuit is improved, but the parasitic capacitance increases and transmission characteristics are degraded
Solution Approach 1:
The demultiplexing circuit is divided into multiple independent demultiplexing circuits, each handling a subset of communication bands. Each demultiplexing circuit has its own band switch with a limited number of selection target terminals, preventing excessive parasitic capacitance while collectively supporting a large number of communication bands through parallel operation.
2Adaptability or versatility
If the number of selection target terminals is increased to support more communication bands, then the adaptability is improved, but the control system complexity increases
Solution Approach 1:
The control system is segmented into multiple independent control units, each controlling a separate demultiplexing circuit. This modular control approach reduces the complexity of any single control unit while collectively managing a large number of communication bands, as each control unit only needs to handle a subset of bands.
3Loss of energy
If the conductor width is increased to reduce transmission loss, then the transmission efficiency is improved, but the parasitic capacitance increases and transmission characteristics are degraded
Solution Approach 1:
The signal transmission path is segmented across multiple demultiplexing circuits operating in parallel. Each circuit handles a subset of communication bands with moderate conductor widths, achieving acceptable transmission loss without excessive parasitic capacitance. The segmented architecture allows optimization of conductor width for each subset rather than requiring uniformly wide conductors for all bands.
Data Source
AI summary
A demultiplexing circuit (10) includes a band switch (20) and a first communication band phase adjustment circuit (30). The band switch (20) includes a shared terminal (P20) connected to a shared connection end (110), a first selection target terminal (P21) connected to a second signal end (122), and a second selection target terminal (P22) connected to a third signal end (123). In the band switch (20), the first selection target terminal (P21) and the second selection target terminal (P22) are selectively connected to the shared terminal (P20) in response to the communication band to be transmitted. The first communication band phase adjustment circuit (30) is connected between a first signal end (121) and a predetermined position in a transmission path where the shared connection end (110) and the shared terminal (P20) are connected.