Closed-Loop Power Control with Adaptive Linearization
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Solution Overview
Problem
Radio frequency transmission systems face challenges in quickly stabilizing power output when transitioning between target power levels, leading to settling time issues and diminished linearity due to coarse gain changes, which existing closed-loop power control systems struggle to address effectively.
Innovation Solution
Implementing a programmable amplifier with multiple feedback loops and a calibration module that selects the appropriate feedback loop based on the desired power target, combined with adaptive power amplifier linearization using predistortion correction and gain hysteresis to minimize distortion and stabilize power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single closed-loop power control system is used, then the system structure is simple, but the settling time is long and linearity is diminished during power transitions
Solution Approach 1:
The patent divides the single closed-loop power control system into multiple parallel feedback loops (first feedback loop and second feedback loop), each optimized for specific power ranges. This segmentation allows the system to switch between loops based on desired power levels, reducing settling time during transitions while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The patent implements dynamic selection between different feedback loops based on the desired power level. The system transitions from a static single-loop design to a dynamic multi-loop architecture where the appropriate loop is activated according to real-time power requirements, enabling faster settling during power transitions.
2Speed
If coarse gain changes are applied during power transitions, then the power adjustment speed is fast, but signal linearity is diminished
Solution Approach 1:
The patent applies different feedback loop characteristics to different power ranges. Each feedback loop is optimized with specific gain settings and compensation parameters tailored to its designated power range, ensuring that linearity is maintained locally within each range while enabling fast transitions between ranges through loop switching.
Solution Approach 2:
The patent changes system parameters (feedback loop configuration, gain settings, predistortion coefficients) based on the desired power level. By switching between pre-configured feedback loops with optimized parameters for different power ranges, the system achieves fast power adjustment without compromising signal linearity within each operating range.
3Loss of time
If multiple feedback loops are implemented, then the settling time is reduced and linearity is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple feedback loops into a unified power control system with centralized switching logic and shared components (power detector, calibration module, predistortion processor). This merging approach reduces the overall complexity that would result from completely separate loop implementations while maintaining the performance benefits of multiple specialized loops.
Solution Approach 2:
The patent designs the feedback loops to share common functionality and infrastructure. The power detector, calibration module, and predistortion processing unit serve multiple loops simultaneously, reducing redundant components. The switching mechanism universally selects between loops based on power range, creating a multi-functional system that achieves fast settling without proportional increases in complexity.
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
This approach reduces settling time and maintains signal linearity by using specific feedback loops for each power target and applying hysteresis to avoid large gain changes, ensuring accurate and efficient power transmission.
Implementation Method 1
The power detector is configured to generate a power measurement in response to the transmit power
Implementation Method 2
gain hysteresis to minimize distortion and stabilize power output
Implementation Method 3
adaptive power amplifier linearization using predistortion correction
Data Source
AI summary
A radio frequency transmitting system includes a programmable amplifier, a power amplifier, a power detector, and a calibration module. The programmable amplifier is configured to amplify an input signal to generate an amplified signal. The power amplifier is configured to output a transmit signal in response to the amplified signal. The transmit signal has a transmit power. The power detector is configured to generate a power measurement in response to the transmit power. The calibration module is configured to implement a plurality of feedback loops to adjust a gain of the programmable amplifier in response to a difference between the power measurement and a desired transmit power. The calibration module is configured to select one of the plurality of feedback loops in response to the desired transmit power.