Power Amplifier Bias Control Switching Frequency Offset
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Solution Overview
Problem
In wireless communication systems, the switching frequency of DC-DC converters and their harmonics can interfere with the reception band, causing performance degradation due to radiative noise and signal distortion.
Innovation Solution
A power amplification apparatus and method that apply an offset to the switching frequency to prevent it from entering the reception band, using a controller, switch mode converter, comparator, and variable resistance unit to adjust the switching frequency and harmonics, ensuring they do not interfere with the reception band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a DC-DC converter is used to control bias voltage of the power amplifier, then power efficiency is improved, but switching frequency and harmonics interfere with the reception band causing performance degradation
Solution Approach 1:
The patent applies preliminary anti-action by detecting whether switching frequency components fall within the reception band before transmission occurs, and proactively adjusting the switching frequency to avoid interference. The controller predicts potential interference and modifies the DC-DC converter's switching frequency in advance, preventing harmful effects rather than correcting them after occurrence.
Solution Approach 2:
The patent implements dynamics by making the switching frequency adjustable and adaptive rather than fixed. The controller dynamically changes the switching frequency of the DC-DC converter based on real-time detection of reception band usage, allowing the system to adapt its operating parameters to avoid interference while maintaining power efficiency.
2Reliability
If the switching frequency is adjusted to avoid the reception band, then reception performance is improved, but the complexity of the control system increases
Solution Approach 1:
The patent applies feedback by implementing a closed-loop control system where the controller continuously monitors the switching frequency, detects whether it falls within the reception band, and automatically adjusts it accordingly. This feedback mechanism ensures reliable reception performance while managing system complexity through automated control rather than manual intervention.
Solution Approach 2:
The system applies self-service by enabling the controller to autonomously detect interference conditions and adjust the switching frequency without external intervention. The controller monitors its own operation and self-corrects potential interference issues, reducing the need for additional complex control infrastructure.
Data Source
AI summary
Various embodiments of the present invention relate to a power amplification device and method, wherein the power amplification device can comprise: a power amplifier; a switch mode converter for controlling a bias of the power amplifier; a comparator for providing a switching signal to the switch mode converter according to an envelope signal; and a control unit for determining whether a switching frequency of the switch mode converter is within a specific band and applying an offset to the switching frequency so as to deviate from the specific band if the switching frequency of the switch mode converter is within the specific band. Various other embodiments can be carried out.