MEMS Tunable Front End for Carrier Aggregation With Lower Noise
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Solution Overview
Problem
Current wireless devices face challenges in minimizing size, cost, and power consumption while supporting carrier aggregation, due to the complexity of circuitry and the need for multiple off-chip components, which leads to increased noise figures and insertion losses.
Innovation Solution
The implementation of a tunable front-end module using microelectromechanical system (MEMS) technology, including tunable filters and amplifiers, to reduce the number of off-chip components and optimize gain distribution, thereby minimizing power consumption and noise figures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple off-chip components are used to support carrier aggregation, then bandwidth and throughput are improved, but device size, cost, and power consumption increase
Solution Approach 1:
The patent integrates multiple filter functions (Tx filter, Rx filter, and duplexing functions) into a single MEMS duplexer component. This consolidation reduces the number of discrete off-chip components required for carrier aggregation, thereby decreasing device size while maintaining the necessary bandwidth and throughput capabilities.
Solution Approach 2:
The MEMS duplexer is designed to perform multiple functions simultaneously: it provides transmit filtering, receive filtering, and duplexing (separating Tx and Rx paths) across multiple frequency bands. This multi-functionality eliminates the need for separate dedicated components for each function, reducing overall device size and component count.
2Productivity
If multiple off-chip components are used to support carrier aggregation, then bandwidth and throughput are improved, but power consumption increases
Solution Approach 1:
By combining multiple filtering and duplexing functions into a single MEMS duplexer, the patent reduces the total number of active components that consume power. Fewer discrete components mean reduced cumulative power consumption while maintaining carrier aggregation capabilities for high throughput.
3Productivity
If multiple off-chip components are used to support carrier aggregation, then bandwidth and throughput are improved, but noise figures and insertion losses increase
Solution Approach 1:
The integration of multiple filter functions into a single MEMS duplexer reduces the number of inter-component connections and interfaces. This minimizes cumulative insertion losses and noise figures that would otherwise accumulate across multiple discrete components, thereby improving signal quality while supporting carrier aggregation.
4Area of stationary object
If circuitry is integrated on-chip to reduce size and cost, then device size and cost are reduced, but complexity of circuitry increases
Solution Approach 1:
The patent integrates the duplexer functionality directly into the RFIC chip, combining what would traditionally be separate off-chip components (Tx filter, Rx filter, duplexing switches) into a single integrated circuit block. This integration reduces die area and eliminates external component connections while managing complexity through systematic design of the integrated structures.
5Measurement precision
If narrower bandwidth filters are used, then selectivity and rejection are improved, but insertion loss increases
Solution Approach 1:
The patent employs tunable MEMS filters that can dynamically adjust their bandwidth and center frequency. By changing the operational parameters of the filters based on the specific carrier aggregation configuration in use, the system optimizes the balance between selectivity (narrower bandwidth when needed) and insertion loss (wider bandwidth when signal strength is critical), rather than being fixed at a single bandwidth setting.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in improved transmit/receive performance, reduced power consumption, and increased efficiency by integrating MEMS duplexers and amplifiers within the radio frequency integrated circuit (RFIC), allowing for narrower bandwidths and better antenna matching, thus enhancing battery life and device functionality.
Implementation Method 1
The first tunable filter and the second tunable filter may use microelectromechanical system (MEMS) technology
Data Source
AI summary
A wireless device is described. The wireless device includes a tunable front end module. The tunable front end module includes a Tx microelectromechanical system bandpass filter. The tunable front end module also includes a first Rx microelectromechanical system bandpass filter. The wireless device also includes a power amplifier. The wireless device further includes a low noise amplifier.