Multifunctional Filter Switching to Minimize Insertion Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-mode cellular phones with separate circuit elements for TDD and FDD modes suffer from higher component count, increased production costs, bulkier packaging, and increased power consumption due to higher insertion loss in band-pass filters compared to low-pass filters.
Innovation Solution
A multifunctional filter that can be configured to operate in either band-pass or low-pass mode, minimizing insertion loss by switching between modes based on signal type, thereby reducing the need for separate circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuit elements optimized for TDD and FDD modes are used, then mode-specific performance is improved, but device complexity and component count increase
Solution Approach 1:
The patent implements a single filter circuit that can operate in multiple modes (TDD and FDD) by dynamically reconfiguring its filtering characteristics. The filter transitions between band-pass and low-pass modes based on the operational mode, eliminating the need for separate dedicated filters for each mode while maintaining mode-specific performance requirements.
Solution Approach 2:
The filter circuit employs dynamic reconfiguration capability where the filtering characteristics can be changed in real-time based on the operational mode. Switching mechanisms allow the filter to adapt its response (band-pass for FDD, low-pass for TDD) dynamically, enabling a single static circuit to perform multiple functions that previously required separate circuits.
2Measurement precision
If band-pass filters are used for FDD mode, then frequency selectivity is improved, but insertion loss increases
Solution Approach 1:
The patent changes the operational parameters of the filter circuit based on the mode of operation. By switching the filter's characteristics (from band-pass to low-pass) according to whether FDD or TDD mode is active, the system optimizes the balance between frequency selectivity and insertion loss for each specific operational context.
Solution Approach 2:
The filter dynamically adjusts its frequency response characteristics to match the operational requirements. When FDD mode is active, band-pass characteristics provide frequency selectivity; when TDD mode is active, low-pass characteristics minimize insertion loss. This dynamic adaptation resolves the contradiction between selectivity and loss.
3Reliability
If separate optimized circuits for TDD and FDD are implemented, then mode-specific optimization is improved, but power consumption increases
Solution Approach 1:
Instead of maintaining separate optimized circuits for TDD and FDD modes that would each consume power simultaneously or require separate power management, the patent uses a single universal filter circuit that serves both modes. This eliminates redundant circuitry and reduces overall power consumption while maintaining mode-specific optimization through dynamic reconfiguration.
Data Source
AI summary
Methods and system for using a multifunctional filter to minimize insertion loss in a multi-mode communications system are described. Specifically described is a multifunctional filter that is configurable to operate in a band-pass mode when a first type of signal is propagated through the multifunctional filter, and to operate in a low-pass mode when a second type of signal is propagated through the multifunctional filter. The multifunctional filter presents a lower insertion loss to the second type of signal when operating in the low-pass mode than in the band-pass mode.