Dual-Path RF Transmitter Switching for Low-Power Battery Savings
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Solution Overview
Problem
Existing wireless device transmitters are inefficient at medium and low output power ranges, leading to wasted battery power and reduced talk times due to their inability to maintain high efficiency across a wide dynamic range requirement.
Innovation Solution
A dual-path transmitter design where a main transmission path operates efficiently at high output power levels and a high-efficiency transmission path, with specific components optimized for medium to low power levels, ensures efficient operation across the entire power range by switching between paths based on power level thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmitter design is used to cover the entire dynamic range, then device complexity is reduced, but transmitter efficiency deteriorates at medium and low power levels
Solution Approach 1:
The transmitter is divided into two separate transmission paths: a first transmission path optimized for high power output and a second transmission path optimized for medium to low power output. Each path has its own power amplifier and associated components, allowing each to be independently optimized for its specific power range, thereby improving overall efficiency without significantly increasing complexity
Solution Approach 2:
The transmitter dynamically switches between the first and second transmission paths based on the required output power level. A controller monitors the power requirements and activates the appropriate path, enabling the system to adapt its efficiency characteristics to match the operating conditions
2Area of stationary object
If transmit power is increased to extend coverage area, then base station coverage is improved, but signal interference increases for devices closer to the base station
Solution Approach 1:
The system changes the transmit power parameter dynamically based on the device's distance from the base station. The dual-path transmitter enables precise control over power output levels, allowing devices to transmit at appropriately scaled power levels that extend coverage while preventing excessive interference to other devices in the network
3Device complexity
If a conventional single-path transmitter is used, then device complexity is low, but talk time is reduced due to inefficient power usage at medium power levels
Solution Approach 1:
The transmitter architecture is segmented into two distinct paths with separate power amplifiers and control circuits. This segmentation allows each path to operate at peak efficiency in its designated power range, significantly reducing battery current consumption during medium to low power operations and thereby extending talk time
Solution Approach 2:
The system implements parameter changes by switching between different transmission paths based on power level requirements. This dynamic parameter adjustment ensures optimal efficiency across the entire operating range, directly impacting battery life and talk time performance
Data Source
AI summary
A high efficiency transmitter is disclosed. In an exemplary embodiment, a transmitter is provided that includes a first transmission path configured to receive a baseband signal and generate a first RF output when output power is in a first output power range, and a second transmission path configured to receive the baseband signal and generate a second RF output when the output power is in a second output power range.