Shared Envelope Tracking Circuit for Multi-Band PA Power Supply
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Solution Overview
Problem
Existing wireless communications devices face challenges in efficiently managing power consumption and space utilization due to the need for multiple power amplifiers and envelope tracking modulators to support various bandwidths, particularly with the introduction of 5G technology, leading to increased power consumption and limited space on printed circuit boards.
Innovation Solution
A wireless communications system that utilizes a shared power supply circuit with an envelope tracking modulator to power multiple power amplifier circuits with different bandwidths, adjusting inductance values and enabling/disabling connections based on bandwidth requirements to optimize efficiency and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power amplifier circuits and envelope tracking modulators are used to support various bandwidths, then the device can support multiple communications technologies, but the power consumption increases and the space on printed circuit boards is limited
Solution Approach 1:
The patent implements a universal power supply circuit that can serve multiple power amplifier circuits with different bandwidth requirements. The power supply circuit includes an envelope tracking modulator that dynamically adjusts output impedance to match different load conditions, allowing one power supply circuit to efficiently power multiple power amplifiers across various communication standards (4G, 5G, etc.), thereby reducing the total number of components and overall power consumption.
Solution Approach 2:
The patent employs dynamic impedance adjustment through the envelope tracking modulator, which continuously adapts the output impedance based on the instantaneous bandwidth and power requirements of the active power amplifier circuit. This dynamic adaptation enables efficient power delivery across varying operational conditions without requiring separate dedicated power supply circuits for each bandwidth scenario.
2Adaptability or versatility
If multiple power amplifier circuits and envelope tracking modulators are used to support various bandwidths, then the device can support multiple communications technologies, but the space on printed circuit boards increases
Solution Approach 1:
The patent merges multiple power supply functions into a single integrated power supply circuit that can serve multiple power amplifier circuits. By combining the envelope tracking modulator and power management functions into one shared circuit, the design eliminates the need for separate power supply circuits for each power amplifier, thereby significantly reducing the space required on the printed circuit board while maintaining support for multiple communication technologies.
Solution Approach 2:
The universal power supply circuit is designed to handle multiple communication standards and bandwidth configurations through a single multi-functional unit, reducing component count and freeing up valuable PCB real estate for other critical components.
3Device complexity
If a shared power supply circuit is used to power multiple power amplifier circuits with different bandwidths, then the quantity of circuits is reduced and space is saved, but the precision of power supply varies with bandwidth requirements
Solution Approach 1:
The patent dynamically changes the output impedance parameter of the power supply circuit based on the instantaneous bandwidth and power requirements of the active power amplifier. The envelope tracking modulator monitors the RF signal envelope and adjusts the power supply parameters in real-time, ensuring optimal power delivery precision for each specific bandwidth scenario (4G, 5G, etc.) while using a single shared power supply circuit.
Solution Approach 2:
The system incorporates feedback mechanisms where the envelope tracking modulator continuously monitors the power amplifier's instantaneous power requirements and adjusts the power supply output accordingly. This closed-loop control ensures that the shared power supply circuit maintains high precision for different bandwidth scenarios by adapting to real-time conditions rather than using fixed parameters.
Data Source
AI summary
A power supply circuit in a wireless communications system includes an envelope tracking modulator coupled to a first power amplifier circuit and a second power amplifier circuit, so that the power supply circuit supplies power to the first power amplifier circuit and the second power amplifier circuit. When a transmit signal output by a processor is within a first bandwidth range, the power supply circuit supplies power to the first power amplifier circuit, and the first power amplifier circuit amplifies power of the transmit signal. When the transmit signal output by the processor meets a second bandwidth range, the power supply circuit supplies power to the second power amplifier circuit, and the second power amplifier circuit amplifies the transmit signal.