Power Supply Circuit With Capacitive Filtering for RF PA Efficiency
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Solution Overview
Problem
The increasing demand for higher communication rates and wider bandwidths in mobile wireless communication technologies, such as 4G and 5G, poses challenges in improving the transmit efficiency of radio frequency power amplifiers, particularly due to high power consumption which affects the service life of electronic devices.
Innovation Solution
A wireless communication system incorporating a processing circuit, linear amplification circuit, switch amplification circuit, and filter capacitors is designed to enhance transmit efficiency by filtering out low frequency and direct current parts from power supply voltages, allowing for a lower power supply voltage for the linear amplification circuit and supporting higher peak voltages, thereby increasing the power output of the power amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional power supply circuit is used for the power amplifier, then the circuit structure is simple, but the transmit efficiency is low and power consumption is high
Solution Approach 1:
The power supply circuit is segmented into multiple independent components: a first power supply circuit for providing a first power supply voltage, a second power supply circuit for providing a second power supply voltage, and a third power supply circuit for providing a third power supply voltage. Each segment operates independently to supply power to different parts of the amplifier circuit, enabling optimized power management and improved transmit efficiency while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The power supply voltages are made dynamic and adjustable rather than fixed. The first, second, and third power supply circuits can independently adjust their output voltages to match the instantaneous requirements of the amplifier stages. This dynamic power supply approach allows the circuit to adapt to varying signal conditions, improving transmit efficiency by providing optimal power levels only when needed.
2Use of energy by moving object
If the power supply voltage is reduced to lower power consumption, then energy efficiency improves, but the peak voltage support capability decreases
Solution Approach 1:
The power supply system uses dynamic voltage adjustment where the first, second, and third power supply voltages can be independently controlled and adjusted in real-time. This allows the system to maintain low average power consumption while providing high peak voltage support when required by the signal envelope, effectively resolving the contradiction between energy efficiency and peak power capability.
Solution Approach 2:
The system changes the parameter of power supply voltage from a fixed value to a variable parameter that can be dynamically adjusted. By controlling the voltage levels of the three power supply circuits independently, the system can optimize energy efficiency during low-power periods while maintaining the capability to deliver high peak voltages when the signal requires maximum output power.
3Ease of manufacture
If a single power supply voltage is used, then the circuit design is simplified, but the ability to support high peak voltages and improve transmit efficiency is limited
Solution Approach 1:
The power supply system is segmented into three independent power supply circuits, each providing a dedicated voltage rail (first, second, and third power supply voltages). This segmentation allows each circuit to be optimized for specific functions while maintaining overall design simplicity through modular architecture, thereby improving transmit efficiency without significantly complicating the manufacturing process.
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 solution improves the transmit efficiency of the power amplifier, reduces power consumption, and extends the service life of electronic devices by enabling a larger power output with a lower power supply voltage, while also reducing hardware costs through efficient power management.
Implementation Method 1
The first filter capacitor is configured to filter out a low frequency part and a direct current part in the first envelope signal, or filter out a low frequency part and a direct current part in the first power supply voltage
Data Source
AI summary
A wireless communication system includes: a processing circuit, at least one linear amplification circuit, a switch amplification circuit, at least one first filter capacitor, and at least one power amplifier. An output end of the switch amplification circuit, an output end of the linear amplification circuit, and a power supply end of the power amplifier are coupled at a first node. The first filter capacitor is coupled to an input end of the linear amplification circuit or the output end of the linear amplification circuit.