Multi-Mode LNA Architecture for Low-Current Carrier Aggregation
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Solution Overview
Problem
State-of-the-art low noise amplifiers (LNAs) consume excessive current when supporting multiple carrier signals in intra-carrier aggregation (Intra-CA) systems, making them impractical for processing three or more carrier signals.
Innovation Solution
A current-efficient LNA circuit design utilizing a single first amplification stage for single-carrier processing and multiple amplification paths in a second stage for multiple-carrier processing, where each amplification path consumes significantly less current, allowing for efficient processing of multiple carrier signals without the need for multiple gain stages in the first amplifier stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If state-of-the-art LNAs use cascode device diverter switching architecture to support Intra-CA, then multiple carrier signals can be processed, but current consumption increases significantly
Solution Approach 1:
The LNA is divided into two distinct amplifier stages: a first amplification stage optimized for single-carrier processing and a second amplification stage with multiple parallel amplification paths for multi-carrier processing. This segmentation allows the system to activate only the necessary stage based on the number of carriers, reducing overall current consumption while maintaining multi-carrier capability.
Solution Approach 2:
The system dynamically switches between different amplification configurations based on the number of active carriers. For single-carrier operation, only the first amplification stage is active. For multi-carrier operation, the second amplification stage with multiple parallel paths is activated. This dynamic adaptation optimizes current consumption according to the actual operational requirements.
2Adaptability or versatility
If multiple gain stages are used in the first amplifier stage for multiple carrier processing, then multi-carrier signals can be amplified, but device complexity increases
Solution Approach 1:
The amplification function is segmented across two stages: the first stage handles single-carrier amplification with a single gain stage, while the second stage provides multi-carrier amplification through multiple parallel amplification paths. This segmentation avoids the need for multiple gain stages in the first amplifier stage, reducing device complexity while maintaining multi-carrier capability.
Solution Approach 2:
The second amplification stage with multiple parallel amplification paths serves as a universal solution for multi-carrier processing. These parallel paths can handle any number of carrier signals by selectively activating the required number of paths, providing a scalable and flexible architecture without increasing the complexity of the first amplification stage.
Data Source
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AI summary
A device includes a multi-mode low noise amplifier (LNA) having a first amplifier stage, and a second amplifier stage coupled to the first amplifier stage, the second amplifier stage having a plurality of amplification paths configured to amplify a plurality of carrier frequencies, the first amplifier stage configured to bypass the second amplifier stage when the first amplifier stage is configured to amplify a single carrier frequency.