Two-Stage Low Noise Amplifier for Current-Efficient Multi-Carrier RF
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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-band carrier-aggregation systems, making them impractical for processing three or more carrier signals effectively.
Innovation Solution
A current-efficient LNA design featuring 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 handling 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 LNA uses cascode device diverter switching architecture to support Intra-CA, then multiple carrier signals can be processed, but current consumption becomes excessively large
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 each stage to be optimized for its specific function, reducing overall current consumption when processing multiple carriers compared to using a single high-capability stage for all scenarios.
Solution Approach 2:
The system dynamically switches between the first amplification stage for single-carrier operation and the second amplification stage for multi-carrier operation. This dynamic adaptation allows the LNA to consume less current by activating only the necessary amplification paths based on the number of carrier signals being processed, rather than maintaining all paths active at all times.
2Adaptability or versatility
If multiple gain stages are used in the first amplifier stage to handle multiple carriers, then carrier processing capability improves, but device complexity and current consumption increase
Solution Approach 1:
The amplification functionality is segmented across two stages: the first stage maintains simplicity for single-carrier operation, while the second stage provides the necessary complexity only when multi-carrier processing is required. This segmentation avoids the need for a complex first stage that would be required if it had to handle all multi-carrier processing independently.
Solution Approach 2:
The second amplification stage with its multiple parallel amplification paths serves as a universal solution that can handle any number of carrier signals (2 or more carriers). This multi-functional design eliminates the need for separate dedicated circuits for different carrier configurations, reducing overall device complexity while maintaining versatility.
Data Source
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.