Split LNA with Independent Gain Control for Multi-SIM Interference
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Solution Overview
Problem
Wireless communication networks face interference and increased complexity due to multiple subscriber identity modules (SIMs) operating on different radio access technologies, requiring efficient amplification and signal processing to maintain high signal integrity and bandwidth across varying network conditions.
Innovation Solution
The implementation of a split low noise amplifier (LNA) in RF transceivers with adjustable gain control using slice control, bias control, and attenuator control allows for separate amplification of carrier signals, reducing the need for external LNAs and minimizing interference by using a single conductor for RF signal transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate LNAs are used for different carrier signals to provide different amplification levels, then signal processing capability is improved, but device complexity increases
Solution Approach 1:
The single LNA is segmented into multiple output paths (first output and second output) with independent gain control mechanisms. Each output path can be independently configured to provide different amplification levels for different carrier signals, enabling the LNA to function as multiple LNAs would while maintaining a single physical device structure.
Solution Approach 2:
The LNA is designed to perform multiple functions by providing different amplification levels through its different outputs based on the operating mode (MSIM or CA). The same LNA device serves both MSIM operation requiring different gains and CA operation requiring coordinated gains, eliminating the need for separate dedicated LNAs for each function.
2Adaptability or versatility
If multiple conductors are used to carry differently-amplified signals from RFFE to RF transceiver, then signal transport capability is improved, but interference increases
Solution Approach 1:
The patent merges the signal transport function into a single conductor by providing different amplification levels directly at the LNA outputs within the RF transceiver. This eliminates the need for multiple separate conductors to carry differently-amplified signals from an external RFFE, thereby reducing conductor count and minimizing interference while maintaining full signal transport capability.
3Adaptability or versatility
If external LNAs are used in RFFE for different carrier signals, then amplification flexibility is improved, but device form factor increases
Solution Approach 1:
The patent combines the LNA function that would traditionally be distributed across multiple external components in the RFFE into a single integrated LNA device within the RF transceiver. This consolidation maintains amplification flexibility through independent gain control of multiple outputs while significantly reducing the device form factor by eliminating external LNA components and their associated mounting space.
4Reliability
If different gains are applied to different carrier signals, then signal integrity is improved, but processing complexity increases
Solution Approach 1:
The LNA incorporates dynamic gain control mechanisms that can adjust the amplification level of each output path based on the operating mode (MSIM or CA) and signal conditions. The gain values are dynamically configurable through control interfaces, allowing the system to optimize signal integrity for different scenarios without requiring complex fixed circuitry for each possible gain combination.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communications that support multiple subscriber identity module (MSIM) operation. In a first aspect, an apparatus for wireless communications includes an input port for receiving a radio frequency (RF) signal comprising a first carrier corresponding to a first subscriber identity module (SIM) and a second carrier corresponding to a second subscriber identity module (SIM); and a split low noise amplifier (LNA) coupled to the input port and a first output port and a second output port, the split LNA configured to output the RF signal with a first gain as a first amplified RF signal at the first output port and to output the RF signal with a different, second gain as a second amplified RF signal at the second output port. Other aspects and features are also claimed and described.