Adaptive RF Filter Switching for Harmonic Suppression
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Solution Overview
Problem
Conventional mobile communication devices face challenges in efficiently filtering RF signals due to the tradeoff between in-band losses and harmonic suppression, particularly in adapting to different frequency ranges and power output requirements.
Innovation Solution
The implementation of an adaptive filter with switchable filter elements and a controller that selectively activates or deactivates these elements based on the RF signal or its baseband version, allowing for dynamic adjustment of filter structures to optimize frequency response and reduce insertion losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fixed filter structures are used, then manufacturing is simple, but adaptability to different frequency ranges and power output requirements is poor
Solution Approach 1:
The filter structure is made dynamic through switchable filter elements that can be selectively activated or deactivated based on the frequency range and power output requirements. The controller dynamically adjusts which filter elements are engaged, allowing the same physical filter structure to adapt to different operating conditions without requiring multiple fixed filters.
Solution Approach 2:
A single filter structure is designed to perform multiple functions across different frequency ranges and power levels. By incorporating switchable elements controlled by a controller, the filter can universally handle various operating conditions that would traditionally require separate dedicated filters for each frequency band or power level.
2Object-generated harmful factors
If fixed filter structures with high harmonic suppression are used, then harmonic suppression is improved, but in-band losses increase
Solution Approach 1:
The filter dynamically adjusts its characteristics by selectively activating specific filter elements based on the operating conditions. When high harmonic suppression is needed, certain elements are activated; when operating in conditions where in-band losses would be problematic, different elements are activated to maintain lower losses. This dynamic switching allows optimization of the harmonic suppression to loss tradeoff in real-time.
Solution Approach 2:
The filter changes its electrical parameters (impedance, resonance frequency, Q-factor) by activating or deactivating specific filter elements. This allows the filter to adjust its harmonic suppression capability and in-band loss characteristics as parameters, enabling optimization for different operating conditions without being fixed at a single compromise point.
3Adaptability or versatility
If adaptive filter with switchable elements is used, then adaptability to different frequency ranges is improved, but device complexity increases
Solution Approach 1:
The filter incorporates switchable elements that can be dynamically controlled based on power output requirements. The controller monitors the operating conditions and selectively activates or deactivates filter elements to match the current power level, enabling the filter to adapt its characteristics for optimal performance at different power outputs.
Solution Approach 2:
The filter system monitors its own operating conditions and automatically adjusts which filter elements are activated. The controller receives feedback about the current operating state and self-adjusts the filter configuration without requiring external intervention, making the system self-adapting to different power output requirements.
Data Source
AI summary
Embodiments provide a mobile communication device comprising an adaptive filter for filtering a RF signal and a controller. The adaptive filter comprises a first terminal, a second terminal, a reference terminal for providing a reference potential, a first filter structure connected in series between the first terminal and the second terminal, a second filter structure connected in series between the first terminal and the reference terminal, and a third filter structure connected in series between the second terminal and the reference terminal, wherein at least one filter structure of the first, second and third filter structures comprises at least one switchable filter element. The controller is configured to selectively activate or deactivate the at least one switchable filter element based on the RF signal or a baseband version thereof.