Multi-Stage Power Amplifier Supply Inductance for 5G Phase Alignment
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Solution Overview
Problem
The existing power amplifier circuits face challenges in managing the wider frequency band of power supply potential in 5G communication systems, leading to potential distortion in high-frequency signals due to phase differences between power supply and high-frequency signals across multiple stages.
Innovation Solution
The power amplifier circuit design includes a configuration with a first external power supply line having a higher inductance value than a second external power supply line, and a first internal power supply line with a higher inductance value than a second internal power supply line, to synchronize the phase of power supply potential with the high-frequency signal, reducing the likelihood of distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phase of power supply potential is delayed in subsequent-stage power amplifiers to reduce phase difference, then phase synchronization is improved, but in 5G wider frequency bands the phase of power supply potential gets ahead of high-frequency signal phase causing distortion
Solution Approach 1:
The patent applies different inductance values to different power supply lines based on their connection position. Specifically, the first power supply line connected to the first power amplifier has a higher inductance value, while the second power supply line connected to the second power amplifier has a lower inductance value. This local differentiation allows each power amplifier stage to receive appropriately tuned power supply potential phase characteristics, preventing phase advancement issues in 5G wideband operations.
2Use of energy by moving object
If envelope tracking method is used to control power supply potential according to amplitude level, then power consumption is reduced, but phase difference between power supply and high-frequency signal increases causing distortion
Solution Approach 1:
The patent changes the inductance parameter of power supply lines to compensate for phase differences introduced by envelope tracking. By selecting appropriate inductance values for different power supply lines, the phase of power supply potential is adjusted to match the phase of high-frequency signals, thereby eliminating distortion while maintaining the power consumption benefits of envelope tracking.
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 configuration effectively reduces the phase difference between the power supply and high-frequency signals, minimizing distortion in the output signal, particularly in the 5G frequency range.
Implementation Method 1
An inductance value of the first external power supply line is higher than an inductance value of the second external power supply line
Data Source
AI summary
A power amplifier circuit includes a first power supply terminal electrically connected to a first power amplifier; a second power supply terminal electrically connected to a second power amplifier subsequent to the first power amplifier; a first external power supply line configured to electrically connect a power supply circuit configured to output a power supply potential corresponding to an amplitude level of a high-frequency input signal and the first power supply terminal; and a second external power supply line configured to electrically connect the power supply circuit and the second power supply terminal. An inductance value of the first external power supply line is higher than an inductance value of the second external power supply line.