Power Amplifier Supply Voltage Control for Envelope Tracking
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Solution Overview
Problem
The fluctuation of supply voltage in power amplifiers leads to increased power consumption and reduced operational efficiency in wireless communication devices.
Innovation Solution
A control circuit adjusts the supply voltage of a power amplifier based on activity and content information, determining upper and lower limits to maintain it within a desired range, using sensors and head-mounted displays to monitor user activity and analyze image information, and performing smoothing and averaging processes to calculate optimal voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the supply voltage of the power amplifier is not kept constant, then the device can operate with simpler voltage regulation, but this results in increased power consumption and degraded operational efficiency
Solution Approach 1:
The patent implements dynamic supply voltage adjustment by continuously monitoring activity information from sensors and content information from the HMD, then adjusting the power amplifier's supply voltage in real-time to match actual operational demands, transitioning from static to dynamic voltage regulation
Solution Approach 2:
The system changes the supply voltage parameter based on calculated activity levels and content characteristics, adjusting voltage within a determined range (between lower and upper limit voltages) to optimize power consumption while maintaining operational efficiency
2Use of energy by moving object
If the supply voltage is frequently adjusted to optimize power consumption, then energy efficiency improves, but voltage instability may affect power amplifier performance
Solution Approach 1:
The system employs feedback mechanisms by continuously monitoring activity information from sensors and content information from the HMD, comparing current voltage levels against calculated limits, and adjusting the supply voltage accordingly to maintain stability while optimizing power consumption
Solution Approach 2:
The patent calculates and sets upper and lower limit voltages in advance based on activity and content information, creating a voltage range that cushions against excessive fluctuations while still allowing dynamic adjustment for power optimization
Data Source
AI summary
An electronic device includes a power amplifier and a control circuit. The power amplifier is supplied by a supply voltage. The control circuit generates the supply voltage. The control circuit determines an upper limit voltage and a lower limit voltage according to activity information and content information. If the supply voltage is higher than the upper limit voltage, the control circuit will update and decrease the supply voltage. If the supply voltage is lower than the lower limit voltage, the control circuit will update and increase the supply voltage.