High-Frequency Amplifier Circuit With Phase and Supply Delay Matching
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Solution Overview
Problem
Existing power amplifier devices suffer from degradation of linearity due to insufficient support of high frequency signals, leading to errors in error vector magnitude (EVM) and adjacent channel leakage power ratio (ACLR) when envelope tracking is applied.
Innovation Solution
A high frequency circuit with multiple power amplifiers, variable phase shift circuits, and delay circuits that adjust the phase and delay of power supply voltages to match the frequency signal, enhancing beamforming and improving linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If envelope tracking is applied to improve power amplifier efficiency, then power added efficiency is improved, but linearity is degraded due to insufficient support of high frequency signals
Solution Approach 1:
The patent divides the power amplifier system into multiple parallel power amplifiers (first power amplifier and second power amplifier) to handle different frequency components separately. This segmentation allows each amplifier to be optimized for specific frequency ranges, improving overall linearity while maintaining efficiency through envelope tracking.
Solution Approach 2:
The patent introduces a time dimension by applying different delay amounts to the variable power supply voltage for each power amplifier. This temporal differentiation allows the system to maintain proper phase relationships across multiple amplifiers operating at different frequencies, resolving the linearity issue while preserving efficiency benefits.
2Use of energy by moving object
If variable power supply voltage is applied to power amplifiers using envelope tracking, then efficiency is improved, but error vector magnitude and adjacent channel leakage power ratio are degraded
Solution Approach 1:
The patent applies different delay amounts to different power amplifiers based on their specific frequency requirements. This localized optimization ensures that each amplifier receives the appropriate timing adjustment for its operating frequency, maintaining accurate phase relationships and reducing error vector magnitude while preserving efficiency gains.
Data Source
AI summary
A high frequency circuit includes power amplifiers that amplify high frequency signals, a tracker circuit that is configured to output a variable power supply voltage, a phase shift circuit that is connected to an input end of the power amplifier and is configured to vary a phase of a high frequency signal, a phase shift circuit that is connected to an input end of the power amplifier and is configured to vary a phase of a high frequency signal, an array antenna including an antenna that is connected to an output end of the power amplifier and an antenna that is connected to an output end of the power amplifier, first and second delay circuits each of which is connected between the tracker circuit and the power amplifier and is configured to vary a delay time of the variable power supply voltage.