Programmable Baseband Filter Reconfiguration for Stopband Rejection
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Solution Overview
Problem
Wireless communication devices face challenges in adapting to different frequency channels without increasing the complexity and size of integrated circuits, particularly in achieving effective stopband rejection and noise reduction across various bandwidths such as 5G NR, 4G, and GSM networks.
Innovation Solution
A programmable baseband filter apparatus and method that includes a pair of baseband filters with switching devices to selectively couple and configure them for different bandwidth applications, allowing for single-pole or multiple-pole configurations to optimize stopband rejection and noise reduction by borrowing active and passive components between filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate baseband filters are designed for different bandwidth applications (5G NR, 4G, GSM), then stopband rejection and noise reduction performance is improved for each specific application, but device complexity and integrated circuit footprint increase
Solution Approach 1:
The patent implements a universal baseband filter that can operate in multiple bandwidth configurations (5G NR, 4G, GSM) by sharing common active components (amplifiers, switches) and passive components (capacitors, resistors) across different filter modes. The filter uses switching devices to reconfigure the same physical components to achieve different pole configurations and bandwidths, eliminating the need for separate dedicated filters for each wireless standard while maintaining stopband rejection performance.
Solution Approach 2:
The patent merges multiple filter functions into a single integrated filter structure by combining first and second baseband filters that share common components. The switching devices enable the same physical filter to be configured for different bandwidth applications by selectively connecting different capacitors and resistors, thereby combining multiple filter functionalities in one unified circuit that reduces overall IC footprint while providing required stopband rejection for various standards.
2Adaptability or versatility
If filter components are reconfigured for different bandwidth applications, then adaptability across wireless standards is improved, but filter performance consistency may deteriorate
Solution Approach 1:
The patent employs dynamic reconfiguration of filter components through switching devices that can selectively connect different capacitors and resistors based on the required bandwidth application. The filter transitions between different pole configurations (single-pole, complex-pole) and bandwidth modes (5G NR, 4G, GSM) by dynamically switching component connections, maintaining optimal filter performance across varying wireless standards while preserving stopband rejection characteristics through controlled reconfiguration.
3Device complexity
If a single baseband filter is used for multiple bandwidth applications, then device complexity is reduced, but achieving effective stopband rejection across all bandwidths becomes difficult
Solution Approach 1:
The patent changes key filter parameters (pole frequency, bandwidth, stopband rejection characteristics) by selectively switching between different capacitor and resistor values within the same filter structure. By varying the effective capacitance and resistance through switching devices, the filter adapts its pole locations and bandwidth to achieve required stopband rejection performance for different wireless standards (5G NR, 4G, GSM) while maintaining a single unified filter design.
Data Source
AI summary
An aspect includes a filtering method including operating a first filter to filter a first input signal to generate a first output signal; operating a second filter to filter a second input signal to generate a second output signal; and selectively coupling at least a portion of the second filter with the first filter to filter a third input signal to generate a third output signal. Another aspect includes a filtering method including operating switching devices to configure a filter with a first set of pole(s); filtering a first input signal to generate a first output signal with the filter configured with the first set of pole(s); operating the switching devices to configure the filter with a second set of poles; and filtering a second input signal to generate a second output signal with the filter configured with the second set of poles.