Current-Steering Filter for Multi-Band Receiver Jammer Rejection
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Solution Overview
Problem
Current wireless communication devices face challenges in efficiently processing multiple bandwidths and frequencies due to the need for multiple receivers and filters, which increases size and cost, and struggles with jammer interference in non-contiguous carrier aggregation.
Innovation Solution
A hybrid current-mode filter with a reconfigurable baseband filter capable of acting as a narrowband low-pass, wideband low-pass, or band-pass filter, using current steering to steer signals and adjust amplitudes, allowing a single receiver to process various signal types and improve signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple receivers are used to process different bandwidths, then signal processing capability is improved, but device size and cost increase
Solution Approach 1:
The patent implements a universal receiver architecture where a single receiver can process multiple bandwidths (narrowband and wideband) and multiple frequency configurations (contiguous and non-contiguous carrier aggregation) through reconfigurable filtering. The hybrid current-mode filter can be dynamically configured to provide different bandwidth responses, allowing one receiver to replace multiple bandwidth-specific receivers, thereby reducing device size while maintaining versatile signal processing capability
Solution Approach 2:
The patent employs dynamic reconfigurable filtering using a hybrid current-mode filter that can change its bandwidth characteristics in real-time. The filter uses current steering mechanisms to dynamically switch between narrowband and wideband configurations, and between contiguous and non-contiguous carrier aggregation modes, enabling the receiver to adapt to different signal processing requirements without physical reconfiguration
2Manufacturing precision
If multiple bandwidth-specific filters are included, then filtering precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces multiple bandwidth-specific filters with a single universal hybrid current-mode filter that can be reconfigured to provide both narrowband and wideband filtering responses. This universal filter maintains high filtering precision for different bandwidth requirements while significantly reducing device complexity by eliminating the need for multiple separate filter components
Solution Approach 2:
The hybrid current-mode filter implements dynamic reconfiguration capability, allowing it to switch between narrowband and wideband modes, and between contiguous and non-contiguous carrier aggregation configurations. This dynamic adaptability enables the filter to maintain optimal filtering precision for different signal types without requiring multiple static filter designs
3Productivity
If multiple receivers are deployed for carrier aggregation, then data rate is improved, but device cost increases
Solution Approach 1:
The patent enables a single receiver to support carrier aggregation operations across multiple bandwidth configurations through reconfigurable filtering. The hybrid current-mode filter can be configured to pass multiple contiguous or non-contiguous frequency blocks, allowing one receiver to achieve the data rate improvements of carrier aggregation without requiring multiple receivers, thereby reducing device cost
Data Source
AI summary
An apparatus is disclosed for current-mode filtering using current steering. In an example aspect, the apparatus includes a filter. The filter includes a current-steering node, a first output node, a second output node, a wideband path, and a narrowband path. The wideband path is coupled between the current-steering node and the first output node. The wideband path includes a wideband low-pass filter configured to pass frequencies within a wide passband. The narrowband path is coupled between the current-steering node and the second output node. The narrowband path includes a narrowband low-pass filter configured to pass a portion of the frequencies that are within a narrow passband.