RF Front-End Bypass Switching for Dynamic Tx/Rx Gain Control
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Solution Overview
Problem
Wireless devices face challenges in dynamically adjusting receiver and transmit gains across varying signal strengths without compromising noise figure or power efficiency, especially when operating near cell edges or close to base stations, due to limitations in existing power amplifier and low noise amplifier configurations.
Innovation Solution
Incorporating a time division duplex switch with bypass paths in the radio frequency front end of user equipment, allowing for dynamic switching of power amplifier and low noise amplifier stages to reduce power consumption and maintain low noise figure, by selectively coupling bypass paths at intermediate points in the transmit and receive chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If receiver gain is increased to maintain adequate signal to noise ratio when operating near cell edge, then noise figure deteriorates, but if receiver gain is reduced to improve linearity and prevent overload when close to base station, then signal to noise ratio deteriorates
Solution Approach 1:
The patent implements dynamic gain adjustment by making the receiver gain controllable and adaptable based on operating conditions. The system dynamically switches between different gain settings according to signal strength measurements, allowing optimal performance across varying distances from the base station.
Solution Approach 2:
The patent changes the receiver gain parameter based on operating conditions. By measuring signal strength and adjusting the gain parameter accordingly, the system optimizes the balance between noise figure and signal to noise ratio for different deployment scenarios.
2Use of energy by moving object
If transmit power is increased to ensure packets reach furthest client devices, then power consumption increases, but if transmit power is reduced to save energy, then coverage range deteriorates
Solution Approach 1:
The patent implements dynamic transmit power adjustment by making the power level controllable based on distance to client devices. The system adapts transmit power in real-time according to coverage requirements, optimizing the balance between energy consumption and coverage range.
Solution Approach 2:
The patent changes the transmit power parameter based on deployment scenarios and distance to clients. By adjusting this parameter dynamically, the system achieves optimal trade-off between power consumption and coverage area for different operating conditions.
3Adaptability or versatility
If multiple amplification stages are used to achieve large transmit power range, then device complexity increases, but if fewer amplification stages are used, then power adjustment range deteriorates
Solution Approach 1:
The patent segments the amplification function into multiple independent stages, each capable of providing specific gain ranges. This segmentation allows flexible combination of stages to achieve the required total gain while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent designs amplification stages that can serve multiple functions - each stage can operate independently or in combination with others, and can be used for both transmit and receive paths. This multi-functionality reduces overall system complexity while maintaining wide power adjustment range.
Data Source
AI summary
A radio frequency front end of a user equipment for reducing power consumption includes a receive chain having a first low noise amplifier stage, a transmit chain including a first power amplifier stage, a transmit bypass path, a receive bypass path and a time division duplex switch. The transmit bypass path is selectively coupled to a transmit signal path at a first intermediate point of the transmit chain, prior to the first power amplifier stage. The receive bypass path is selectively coupled to a receive signal path at a first intermediate point of the receive chain after the first low noise amplifier stage. The time division duplex switch is selectively coupled to an antenna, the transmit bypass path, the receive bypass path, the first power amplifier stage and the first low noise amplifier stage.