RF Module Filter Sharing for Compact Multi-Band TDD
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Solution Overview
Problem
The challenge is to create a radio-frequency module that can support multiple bands for time division duplex communication while minimizing circuit size and optimizing frequency characteristics, as demanded by the integration needs of modern wireless devices.
Innovation Solution
A radio-frequency module design that includes separate amplifier units for different frequency bands, shared filters for lower frequency bands, and switches for path switching, ensuring dedicated filters for higher frequency bands to maintain high frequency characteristics and reduce circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different multiplex modes are realized by a single radio-frequency module, then the functionality is improved, but the circuit size increases
Solution Approach 1:
The patent combines multiple multiplex modes (FDD and TDD) into a single radio-frequency module by integrating separate circuit paths for each mode on the same substrate. The FDD circuit path includes FDD-specific components while the TDD circuit path includes TDD-specific components, allowing both modes to coexist and be controlled by a single controller, thereby achieving multi-functionality without proportionally increasing circuit size.
Solution Approach 2:
The radio-frequency module is designed with universal capabilities to support both FDD and TDD communication modes through a common substrate and controller architecture. The module can selectively activate appropriate circuit paths based on the required communication mode, enabling a single module to perform multiple functions that would traditionally require separate dedicated modules.
2Area of stationary object
If the circuit size is reduced to make the module smaller, then the space is saved, but the frequency characteristics optimization becomes difficult
Solution Approach 1:
The radio-frequency module is segmented into distinct FDD and TDD circuit paths, each with its own optimized components. This segmentation allows independent optimization of frequency characteristics for each mode while maintaining a compact overall design. The FDD path can be optimized for frequency division characteristics while the TDD path is optimized for time division characteristics, ensuring satisfactory performance for both modes in a reduced-size module.
Data Source
AI summary
A smaller size is achieved by reducing a circuit size and the characteristics of all bands are made satisfactory. A radio-frequency module transmits and receives transmission/reception signals in a first frequency band and transmission/reception signals in a second frequency band lower than the first frequency band by time division duplex communication. A switch allows an output from a filter to be input to a low-noise amplifier upon reception of a signal in the second frequency band and allows an output from a power amplifier to be input to the filter upon transmission of a signal in the second frequency band to thereby share the filter for transmission/reception signals in the second frequency band.