Power-Adaptive Amplifier Linearization for Low- and High-Signal Levels
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Solution Overview
Problem
Amplifiers often exhibit non-linear behavior, particularly for higher-power input signals, leading to varying degrees of gain divergence from ideal linear gain, which existing linearizers may not adequately address without detrimental effects on lower-power signal performance.
Innovation Solution
An auto-linearizing amplifier system with a linearizer that adjusts its linearization modes based on power levels, using multiple discrete or analog modes, and controlling bias signals and electrical parameters of resistive, inductive, and capacitive components to optimize linearization, thereby minimizing adverse effects on lower-power signals while effectively linearizing higher-power signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linearizer is fully enabled to correct non-linear behavior in higher-power signals, then linearization performance for high-power signals is improved, but performance for lower-power signals deteriorates due to detrimental effects
Solution Approach 1:
The linearizer dynamically adjusts its operation mode based on the power level of the input signal. For higher-power signals, the linearizer is fully enabled to provide maximum linearization correction. For lower-power signals, the linearizer is partially disabled or operates in a reduced mode to avoid detrimental effects on signal quality. This dynamic adaptation resolves the contradiction by optimizing linearization performance for each power level independently.
Solution Approach 2:
The system changes the operational parameters of the linearizer based on the input signal power level. By monitoring the power level and adjusting the linearization strength accordingly, the system maintains high linearization accuracy for high-power signals while preserving natural signal characteristics for low-power signals, thus resolving the performance trade-off.
2Measurement precision
If a linearizer is designed to address non-linear behavior across all power levels, then comprehensive linearization is achieved, but the complexity of the linearizer increases
Solution Approach 1:
The linearizer is segmented into multiple operational modes or stages, each optimized for specific power level ranges. Instead of using a single complex linearization circuit designed to handle all power levels, the system divides the operation into discrete segments (e.g., low-power mode, medium-power mode, high-power mode), activating only the appropriate segment for each condition. This reduces overall complexity while maintaining comprehensive linearization coverage.
3Measurement precision
If the linearizer operates in fully enabled mode for all power levels, then maximum linearization correction is applied, but lower-power signals suffer from adverse effects
Solution Approach 1:
Different linearization strategies are applied to different power level ranges. High-power signals receive aggressive linearization correction with full linearizer engagement, while low-power signals receive minimal or no linearization to preserve their natural characteristics. This local quality approach ensures that each power level range receives the appropriate treatment, eliminating harmful effects on low-power signals while maintaining high linearity for high-power signals.
Data Source
AI summary
Examples of the disclosure include an amplifier system comprising an amplifier having an input to receive an input signal, and an output to provide an amplified output signal, the amplifier having a power level indicative of at least one of the input signal power and the amplified output signal power, and a linearizer coupled to the amplifier and having a plurality of modes of operation including a fully disabled mode and a fully enabled mode, the linearizer being configured to determine the power level of the amplifier, select a mode of operation of the plurality of modes of operation based on the power level of the amplifier, determine one or more linearization parameters corresponding to the selected mode of operation, and control linearization of the amplified output signal based on the determined one or more linearization parameters.