Programmable RF Filter Architecture for Multi-Band Signal Attenuation
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Solution Overview
Problem
Existing communication products require multiple filters for different frequency bands, leading to increased component costs and board space usage, and suffer from signal attenuation issues due to varying communication standards and environments.
Innovation Solution
A programmable filter system using a mixer, analog-to-digital converter, digital filter, digital-to-analog converter, and mixer architecture that adjusts filter frequency bands through software and hardware integration, allowing a single filter system to handle multiple frequency bands and enhance signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple single frequency band filters are used to support different frequency bands, then the communication product can operate in multiple frequency bands, but the number of surface acoustic wave elements increases, increasing component cost and board space occupation
Solution Approach 1:
The patent implements a universal filter system that can operate across multiple frequency bands (e.g., 700MHz, 900MHz, 1800MHz, 2100MHz, 2600MHz) using a single programmable surface acoustic wave element combined with a digital signal processing unit. The filter coefficients are programmatically adjusted based on the target frequency band, allowing one physical filter to perform the function of multiple frequency-specific filters, thereby reducing component count while maintaining multi-band adaptability
Solution Approach 2:
The patent employs dynamic filter coefficient adjustment through digital signal processing. The filter characteristics (passband, stopband, cutoff frequencies) are dynamically reconfigured via programmable coefficients stored in memory, allowing the same physical filter hardware to adapt its frequency response characteristics in real-time according to the required communication standard and frequency band, eliminating the need for static multiple filters
2Adaptability or versatility
If multiple filters are used to conform to different country frequency band specifications, then the communication product can operate in all frequency bands, but the component cost and board area are greatly increased
Solution Approach 1:
The patent creates a universal filter platform that can be programmed to meet various international frequency band specifications (e.g., Japanese bands, US bands, European bands) using a single physical filter element. The system includes a programmable surface acoustic wave element with adjustable filter coefficients that can be configured via software to match any required frequency band standard, allowing one filter to replace multiple country-specific filters and reduce component quantity while maintaining global compatibility
3Reliability
If passive filter elements are used for signal filtering, then the filtering function is achieved, but signal attenuation occurs causing reduced product efficiency in areas with weak signal coverage
Solution Approach 1:
The patent replaces traditional passive mechanical filter elements with an active digital signal processing system. Instead of using fixed passive components that inherently attenuate signals, the system uses programmable surface acoustic wave elements combined with digital filtering algorithms that can dynamically adjust filter characteristics and compensate for signal loss through active amplification and signal regeneration, thereby maintaining filtering performance while reducing signal attenuation in weak coverage areas
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
Enables efficient filtering across multiple frequency bands with reduced hardware requirements and improved signal strength, addressing the limitations of passive filters and signal attenuation.
Implementation Method 1
a first mixer for converting an input signal into a first signal according to a reference frequency signal
Implementation Method 2
An analog-to-digital converter is coupled to the first mixer to convert the first signal into a first digital signal
Implementation Method 3
A digital filter is coupled to the analog-to-digital converter to filter the first digital signal according to a first frequency band and generate a second digital signal
Implementation Method 4
A digital-to-analog converter is coupled to the digital filter to convert the second digital signal into a second signal
Implementation Method 5
A second mixer is coupled to the digital-to-analog converter to convert the second signal into an output signal according to the reference frequency signal
Data Source
AI summary
A filter system includes: a first mixer, converting an input signal into a first signal according to a reference frequency signal, wherein the reference frequency signal corresponding to a target frequency band; an analog-to-digital converter, coupled to the first mixer, converting the first signal into a first digital signal; a digital filter, coupled to the analog-to-digital converter, filtering the first digital signal according to a first frequency band and generating a second digital signal, wherein the first frequency band corresponding to the first signal; a digital-to-analog converter coupled to the digital filter, converting the second digital signal into a second signal; and a second mixer, coupled to the digital-to-analog converter, converting the second signal into an output signal according to the reference frequency signal, wherein the output signal corresponds to the input signal filtered by the target frequency band.