Distributed Gain Filter Modules for RF Linearity Control
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Solution Overview
Problem
In RF communication systems, existing filters face challenges with non-linearity due to amplification, leading to deteriorated performance as they struggle to maintain consistent gain across varying input signal strengths.
Innovation Solution
A system of filter modules coupled in series, each comprising a filter and a variable gain element, allows for precise control of gain through control signals, reducing non-linearity and improving linearity and control over the filtering process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If amplification is used to increase signal strength, then signal gain is improved, but non-linearity increases and performance deteriorates
Solution Approach 1:
The filter is divided into multiple cascaded stages, with variable gain elements distributed across different stages. This segmentation allows the total gain to be distributed rather than concentrated in a single amplifier, reducing non-linearity while achieving the required signal amplification.
Solution Approach 2:
Variable gain elements are used throughout the filter, allowing dynamic adjustment of gain at different stages. This enables adaptive control of signal levels while maintaining linearity, as the gain can be optimized for different operating conditions rather than using fixed high-gain amplification.
2Power
If high gain is applied in a single stage, then signal amplification is achieved, but control precision deteriorates
Solution Approach 1:
The total gain requirement is segmented across multiple stages, each contributing a portion of the total gain. This allows for finer control resolution in each stage, as the control range is divided into smaller, more manageable increments, thereby improving overall control precision.
Solution Approach 2:
Rather than applying the full required gain in a single stage, the invention applies partial gain at each stage. This distributed approach allows for more precise control of the signal level, as each stage operates within an optimized gain range that maintains linearity and control accuracy.
Data Source
AI summary
A system for filtering a signal includes a plurality of filter modules coupled in series. Each filter module includes a filter and a variable gain element. Each filter is capable of. receiving an input signal, attenuating a portion of the input signal that is outside a passband associated with the filter, and outputting at least a portion of the input signal that is within the passband associated with the filter. Each variable gain element is capable of receiving a control signal and inducing a gain in an output of the filter based on the control signal.