RF Power Amplifier Voltage Mapping to Suppress Capacitor Noise
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Solution Overview
Problem
Electronic devices experience audible noise due to vibrations in capacitors caused by changes in driving voltage during power amplifier operation, particularly in average power tracking mode, which can be disruptive and uncomfortable for users.
Innovation Solution
The electronic device determines driving voltages based on correlation information between transmission power and voltage, adjusting the voltage levels to minimize peak-to-peak values and reduce audible noise by using association information to control converters and power amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a capacitor is used for APT mode voltage control, then the driving voltage can be controlled based on transmission power, but voltage changes cause capacitor dielectric expansion and contraction that generates audible vibration noise
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple association information tables that map transmission power levels to driving voltage levels. Instead of dynamically adjusting voltage in real-time (which causes noise), the system selects from pre-established voltage-power associations, thereby avoiding rapid voltage fluctuations that would cause capacitor dielectric expansion/contraction and audible noise.
Solution Approach 2:
The patent changes the parameter of driving voltage from continuous dynamic adjustment to discrete stepped levels. By using multiple association information tables with different minimum voltage thresholds, the system transitions voltage in controlled discrete steps rather than continuous changes, reducing the frequency and magnitude of voltage transitions that cause audible noise.
2Volume of moving object
If the distance between receiver and capacitor is short, then the device structure is compact, but the user hears noise with relatively high volume
Solution Approach 1:
The patent introduces an intermediary control mechanism (the communication processor with multiple association information tables) that mediates between the power amplifier and capacitor. This intermediary selects optimal driving voltage levels based on transmission power, thereby reducing voltage fluctuations that would otherwise directly cause capacitor vibration and audible noise, especially important when the receiver is close to the capacitor.
3Adaptability or versatility
If a large change in voltage is applied to the capacitor for APT mode, then the power amplifier can operate across a wide power range, but a relatively high volume of noise is caused
Solution Approach 1:
The patent segments the voltage control range into multiple discrete levels defined by different association information tables. Each table represents a segment with a specific minimum voltage threshold. By dividing the continuous voltage range into segmented steps, the system maintains adaptability across wide power ranges while minimizing the magnitude of voltage changes within each segment, thereby reducing noise.
Solution Approach 2:
The patent implements dynamic selection of association information tables based on current transmission power conditions. The system adaptively switches between different voltage-power association tables to match operating conditions, maintaining optimal performance across varying power ranges while controlling voltage change magnitude to minimize audible noise.
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 approach effectively suppresses audible noise by reducing voltage changes in capacitors, enhancing user experience by minimizing disruptive noise levels.
Implementation Method 1
In a capacitor for the APT mode of the electronic device, charging and discharging may occur according to a change in the driving voltage Vcc. According to occurrence of charging and discharging in the capacitor for the APT mode, expansion and contraction of a dielectric inside the capacitor for the APT mode may occur.
Implementation Method 2
The expansion and contraction of the dielectric may cause generation of vibration. The generated vibration may be transferred to peripheral components.
Data Source
AI summary
An electronic device may include at least one communication processor, an RFIC, at least one power amplifier, and at least one converter, the at least one communication processor is configured to identify at least one first driving voltage corresponding to at least one first transmission power of at least one first RF signal, control a first converter corresponding to a first power amplifier among the at least one converter, so that the at least one first driving voltage is applied to the first power amplifier corresponding to the at least one first RF signal among the at least one power amplifier, identify at least one second driving voltage corresponding to the at least one first transmission power of the at least one first RF signal, control the first converter so that the at least one second driving voltage is applied to the first power amplifier.