Power Amplifier Linearization With Self-Calibrated Dynamic Bias
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Solution Overview
Problem
There is a need for a power amplifier linearizing module that can self-calibrate to optimize dynamic biasing in power amplifiers embedded in mobile units, reducing performance variations across different units and ensuring improved power-added efficiency (PAE) and linearity trade-off.
Innovation Solution
The power amplifier linearizing module includes a processing module that executes feed-forward transfer functions to derive incremental change signals and adjust input signals, generating a linearizing control signal to optimize the power amplifier's performance based on the input signal and control signal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If dynamic biasing is applied to improve power-added efficiency, then PAE is improved, but linearity deteriorates
Solution Approach 1:
The patent implements a closed-loop feedback system where the output signal of the power amplifier is fed back through a feedback network to generate a control signal. This control signal is combined with the input signal to dynamically adjust the bias of the power amplifier, enabling real-time compensation for non-linearities while maintaining efficiency improvements from dynamic biasing.
Solution Approach 2:
The patent introduces a feedback network as an intermediary element that processes the output signal and generates a control signal. This intermediary component mediates between the power amplifier's non-linear behavior and the input signal, enabling linearization through dynamic bias adjustment without directly modifying the power amplifier's internal structure.
2Use of energy by moving object
If dynamic biasing control is implemented to optimize PAE, then efficiency is improved, but device complexity increases
Solution Approach 1:
The feedback network serves multiple functions simultaneously: it provides signal routing, generates the control signal for dynamic biasing, and enables closed-loop feedback for linearization. By making this single component multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby managing complexity while achieving efficiency optimization.
3Reliability
If self-calibration is implemented to reduce performance variations, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements a self-calibration mechanism where the power amplifier system automatically adjusts its own bias characteristics through the feedback loop. During manufacturing or operation, the system can autonomously optimize its performance parameters without requiring external calibration equipment or manual adjustment, thereby improving reliability across different units while avoiding complex manufacturing calibration processes.
Data Source
AI summary
The present power amplifier linearizing module linearizes operation of a power amplifier and operates in parametrizing mode and operation mode. A processing module executes a feed-forward transfer functions set, which includes at least: a transfer function P and a summing function. The transfer function P derives a change signal ΔVa relative to the control signal component received and the summing function summing the incremental change signal ΔVa to an input signal to generate an adjusted input signal. A transfer function G uses the adjusted input signal to generate an RF signal representative of the amplifying of the adjusted input signal based on the control signal component. The processing module determines a linearizing control signal component based on the generated RF signal representative.