Dual-Mode RF Power Amplifier Output Circuit for BLE Efficiency
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Solution Overview
Problem
Bluetooth Low Energy (BLE) technology faces challenges in maintaining conversion efficiency of power amplifiers from direct current to alternating current output across different power output modes, leading to inefficiencies and potential overload in electronic apparatuses.
Innovation Solution
A power amplification output circuit incorporating a cascode power amplifier and an inverter-type power amplifier, coupled with an output transformer, operates in normal and back-off power modes to manage differential radio frequency input signals, preventing overload and maintaining drain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power amplifier is used to cover different power output modes, then the device complexity is reduced, but the conversion efficiency from direct current to alternating current output cannot be maintained across different power modes
Solution Approach 1:
The single power amplifier is segmented into two separate power amplifiers: a first power amplifier configured for normal power output mode and a second power amplifier configured for back off power output mode. Each amplifier is optimized for its specific operating mode, allowing both to maintain high conversion efficiency in their respective modes while providing comprehensive coverage across all power requirements.
2Power
If power output is increased to maintain communication range, then the communication range is maintained, but the power amplifier experiences overload and efficiency loss
Solution Approach 1:
The system dynamically switches between the first power amplifier for normal power output mode and the second power amplifier for back off power output mode based on communication requirements. This dynamic configuration allows the system to maintain adequate communication range while preventing the main power amplifier from operating in overloaded conditions, thereby maintaining reliability and efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents overload during high input power conditions while maintaining the same drain efficiency as the normal power output mode, ensuring efficient power amplification and linearity in BLE technology applications.
Implementation Method 1
The output transformer includes a first side inductor and a second side inductor... output the amplified differential radio frequency input signals to the output transformer through the pair of cascode differential output terminals and further to an antenna through the second side inductor
Data Source
AI summary
The present disclosure discloses a power amplification output circuit. An output transformer includes a first side inductor and a second side inductor. A cascode power amplifier is electrically coupled to the first side inductor. An inverter-type power amplifier is electrically coupled to the first side inductor. The cascode power amplifier is activated under a normal power output mode to receive, amplify and output a differential radio frequency input signals from cascode differential input terminals to the output transformer through cascode differential output terminals further to an antenna through the second side inductor. The inverter-type power amplifier is activated under a back off power output mode to receive, amplify and output the differential radio frequency input signals from inverter-type differential input terminals to the output transformer through inverter-type differential output terminals further to the antenna through the second side inductor.