Multipath LNA Architecture for Multiband RF Size Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low noise amplifiers (LNAs) for mobile communication face increasing complexity and design challenges due to the need for supporting multiple frequency bands and amplifier paths, requiring rapid design changes while minimizing device size and cost.
Innovation Solution
The design incorporates a radio frequency (RF) receiver with current gain blocks and output loads that can be selectively connected to support multiple frequency bands, allowing for easier modifications and size reduction by using one LNA per simultaneous output, enabling band agility and step-variable gain for low Noise Figure and high linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple frequency bands and amplifier paths are supported, then the functionality and adaptability of the LNA are improved, but the device size and design complexity increase
Solution Approach 1:
The LNA architecture employs a universal current gain block that can be selectively connected to different output loads through switching mechanisms, enabling a single amplifier core to serve multiple frequency bands and carrier aggregation scenarios. This multi-functional design allows the same hardware structure to adapt to various operating modes including intra-band continuous/non-continuous carrier aggregation and inter-band carrier aggregation, thereby improving versatility without proportionally increasing device size.
Solution Approach 2:
The LNA is divided into modular components including multiple current gain blocks, output loads, and switching elements that can be independently configured. This segmentation allows selective activation of specific amplifier paths and frequency band combinations based on operational requirements, enabling the system to maintain compact size by only activating necessary segments while preserving the capability to support multiple frequency bands and amplifier paths when needed.
2Adaptability or versatility
If multiple frequency bands and amplifier paths are supported, then the adaptability is improved, but the design complexity increases
Solution Approach 1:
The LNA incorporates dynamic switching mechanisms that allow real-time reconfiguration of amplifier paths and frequency band selections based on operational requirements. The switching elements enable the system to dynamically adapt between different carrier aggregation modes and frequency band combinations without requiring multiple static amplifier designs, thereby improving adaptability while managing design complexity through a unified reconfigurable architecture.
Solution Approach 2:
A universal current gain block design serves multiple frequency bands and amplifier path configurations, reducing the need for separate dedicated amplifiers for each band. This multi-functional approach consolidates the design into a single versatile architecture that can be programmed and configured for different operating modes, thereby improving adaptability while avoiding the complexity of designing and integrating multiple independent amplifier chains.
3Area of stationary object
If device size is reduced, then the manufacturing cost and portability are improved, but the ability to support multiple frequency bands and amplifier paths may be compromised
Solution Approach 1:
Multiple amplifier functions and frequency band handling capabilities are merged into a single integrated LNA architecture with shared current gain blocks and output loads. By combining these functions into one unified structure with selective switching capability, the design achieves compact device size while maintaining the ability to support multiple frequency bands and amplifier paths through intelligent resource sharing and dynamic configuration.
Solution Approach 2:
The LNA is segmented into reusable modular blocks that can be selectively activated. This segmentation allows the compact design to maintain full functionality by only activating the specific segments needed for the current operating mode, thereby supporting multiple frequency bands and amplifier paths without requiring all components to be simultaneously active, which would increase device size.
Data Source
AI summary
Methods and devices used in mobile receiver front end to support multiple paths and multiple frequency bands are described. The presented devices and methods provide benefits of scalability, frequency band agility, as well as size reduction by using one low noise amplifier per simultaneous outputs. Based on the disclosed teachings, variable gain amplification of multiband signals is also presented.