RF Power Amplifier Supply Control for Precise Transmit Power
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Solution Overview
Problem
Existing methods for controlling radio frequency power amplifier transmit signals are inefficient due to constant power supply voltage, leading to imprecise control and suboptimal efficiency, as the correspondence between transmit power and input voltage under constant voltage is not precise enough to meet transmitting requirements.
Innovation Solution
Adjusting the power supply voltage of the power amplifier to an efficiency point voltage and querying the correspondence between input voltage and transmit power at each power level to precisely adjust the input voltage, allowing the power amplifier to operate at an optimum efficiency point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power supply voltage is kept constant, then the control method is simple, but the power amplifier cannot operate at optimum efficiency point and the correspondence between transmit power and input voltage is not precise enough
Solution Approach 1:
The patent applies dynamics by making the power supply voltage adjustable rather than fixed. The controller dynamically adjusts the power supply voltage to different efficiency point voltages based on the required transmit power, enabling the power amplifier to operate at optimum efficiency points while maintaining precise control of the transmit signal.
Solution Approach 2:
The patent changes the parameter of power supply voltage from a constant value to a variable parameter that can be adjusted to different efficiency point voltages. By storing correspondence relationships between input voltages and transmit powers at multiple efficiency point voltages, the system achieves both operational flexibility and control precision.
2Reliability
If the power supply voltage is adjusted to efficiency point voltage, then the power amplifier operates at optimum efficiency and transmit signal control precision is improved, but the control system becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-storing the correspondence relationships between input voltages and transmit powers at multiple efficiency point voltages in a lookup table. When transmission is required, the controller directly queries the stored data to determine the appropriate input voltage, avoiding the need for complex real-time calculations and simplifying the control process.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a stored correspondence relationship table that maps efficiency point voltages, input voltages, and transmit powers. This intermediary data structure enables the controller to efficiently translate between transmit power requirements and corresponding control parameters without requiring complex computational algorithms.
3Productivity
If multiple efficiency point voltages are used, then the power amplifier can operate at optimum efficiency under different transmit powers, but the data storage and querying complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the operating range into multiple discrete efficiency point voltages, with each having its own set of stored correspondence data. This segmentation allows the system to manage complexity by handling one voltage level at a time through simple lookup operations, rather than managing a continuous complex relationship.
Data Source
AI summary
A method and an apparatus for controlling a transmit signal of a radio frequency power amplifier are provided. The method includes: adjusting a power supply voltage of the power amplifier to an efficiency point power supply voltage under designated transmit power; querying correspondence between an input voltage and transmit power at each power level under the efficiency point power supply voltage; and adjusting, according to the correspondence, an input voltage to an input voltage corresponding to the designated transmit power. The embodiments of the present invention, the power amplifier is enabled to work at an optimum efficiency point while the transmit power of the power amplifier is under control, which improves efficiency of the power amplifier.