Power Amplifier Module Supply Filtering for Reception Noise
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Solution Overview
Problem
Power amplification modules using DC-DC converters for power supply voltage suffer from degraded reception band noise characteristics due to noise output from the power supply circuit, especially in high-speed data communication standards like HSUPA and LTE.
Innovation Solution
A power amplification module with a noise removing circuit that filters noise from the power supply voltage supplied by a DC-DC converter, generating a cleaner voltage for the power amplifier to reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a DC-DC converter is used to supply power to the power amplifier in envelope tracking or average power tracking schemes, then power efficiency is improved, but reception band noise characteristics are degraded
Solution Approach 1:
The power supply system is segmented into two independent paths: a first power supply circuit (DC-DC converter) that supplies power during transmission without requiring noise filtering, and a second power supply circuit that supplies power during reception with enhanced noise filtering capabilities. This segmentation allows each path to be optimized for its specific function, resolving the contradiction between power efficiency and noise characteristics.
Solution Approach 2:
The first capacitor is charged in advance during transmission periods when the DC-DC converter is operating, storing energy that can be immediately supplied during reception periods. This preliminary action ensures that the power amplifier can maintain operation during reception without activating the noisy DC-DC converter, thus preserving reception band noise characteristics while maintaining power efficiency.
2Reliability
If power supply voltage is increased to achieve high linearity in large dynamic range, then communication speed is improved, but power consumption increases
Solution Approach 1:
The power supply voltage is made dynamic rather than fixed, allowing it to be adjusted according to the operational requirements. During transmission, higher voltage can be supplied to achieve high linearity for large dynamic range. During reception, the voltage is reduced or supplied from a different circuit to minimize power consumption. This dynamic adjustment resolves the contradiction between maintaining linearity and reducing power consumption.
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
The noise removing circuit effectively suppresses the deterioration of reception band noise characteristics, improving the module's performance by reducing noise levels and maintaining high linearity.
Implementation Method 1
a first noise removing circuit that is inputted with a first voltage supplied from a DC-DC converter, removes noise from the first voltage in order to generate a second voltage
Data Source
AI summary
Provided is a power amplification module that includes: a first power amplifier that amplifies a first signal and outputs a second signal; and a first noise removing circuit that is inputted with a first voltage supplied from a DC-DC converter, removes noise from the first voltage in order to generate a second voltage, and outputs the second voltage as a power supply voltage of the first power amplifier.