Tunable LTE Filter Layout for Fewer TX/RX Band Filters
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Solution Overview
Problem
Conventional communication circuits for LTE-TDD require a large number of filters for transmitting and receiving signals, leading to increased power consumption and space usage due to the need for separate filters for each band and mode.
Innovation Solution
A tunable filter and switch combination that can operate in both transmission and reception modes, reducing the total number of filters needed by utilizing a single filter for multiple bands and modes, with the tunable filter including a tuning component located on the same die as the switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate filters are used for each band and mode (TX/RX), then signal filtering effectiveness is improved, but the number of filters increases leading to higher power consumption and space usage
Solution Approach 1:
The patent implements a single filter that can operate in multiple modes (transmit and receive) and support multiple bands through tuning. The filter is designed with tuning capabilities that allow it to be reconfigured for different frequency bands and operational modes, replacing what would traditionally require multiple dedicated filters. This multi-functional approach directly reduces the quantity of filters while maintaining filtering effectiveness across different bands and modes.
Solution Approach 2:
The patent employs a dynamically tunable filter that can change its characteristics during operation. The filter includes tuning mechanisms that allow real-time adjustment of its filtering parameters to adapt to different bands and modes. This dynamic capability enables a single filter to perform the work of multiple static filters, reducing overall filter count while maintaining signal filtering effectiveness across varying operational requirements.
2Adaptability or versatility
If multiple filters are used to cover multiple LTE bands, then band coverage is improved, but device complexity and space usage increase
Solution Approach 1:
The patent designs a universal filter structure that can cover multiple LTE bands through tuning capabilities. Instead of requiring separate filters for each band, the single filter can be tuned to operate across different frequency ranges. This approach maintains comprehensive band coverage while significantly reducing device complexity by eliminating the need for multiple dedicated filters and their associated switching and control circuits.
Solution Approach 2:
The patent utilizes parameter tuning mechanisms that allow the filter's operational characteristics (such as center frequency and bandwidth) to be changed dynamically. By adjusting these parameters, the same filter hardware can adapt to cover different LTE bands, maintaining versatility while reducing the physical footprint and complexity compared to having separate fixed-frequency filters for each band.
3Reliability
If separate filters are used for transmit and receive modes, then mode-specific filtering performance is improved, but power consumption increases due to multiple filters operating simultaneously
Solution Approach 1:
The patent implements a dynamically reconfigurable filter that can switch between transmit and receive modes as needed. The filter includes control mechanisms that adjust its characteristics based on the current operational mode, allowing it to maintain optimal filtering performance for each mode while being a single shared component. This dynamic sharing approach reduces power consumption compared to having separate always-on filters for each mode.
Solution Approach 2:
The patent merges the transmit and receive filter functions into a single filter structure. Instead of having separate filter circuits for TX and RX that would both need to be powered, the single combined filter is activated only when needed for the current mode of operation. This merging reduces overall power consumption while maintaining mode-specific filtering performance through proper timing and control of the shared filter resource.
Data Source
AI summary
A tunable filter reduces the total number of filters used in TDD (Time-Division Duplex) communication circuitry. The communication circuitry may include a tunable filter and a first switch associated with the tunable filter. The tunable filter may include a tuning component and a filtering component. The tuning component may be located with the first switch on a first die. The filtering component may be located in a laminate underneath the first switch. Power amplifiers for amplifying transmission signals may be located on a second die, and the second die may be located on the laminate.