RF Front-End Dual Power Supply for Low-Voltage High Output
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Solution Overview
Problem
Existing radio frequency front-end modules face limitations in maximum output power due to insufficient working current from power management chips, especially under low voltage and high power conditions, which hinders their ability to implement high power states and satisfies the requirements of modern communication technologies for efficiency.
Innovation Solution
The proposed solution involves a radio frequency front-end module that utilizes both a power supply and a battery supply when a preset power switching condition is met, allowing the module to operate in a high power state even with low voltage, by cascading driver amplifiers and connecting power amplifiers in parallel, and using independently controlled power supply networks with impedance matching networks and bypass capacitors to manage power distribution effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If low voltage power supply is used to avoid Boost DC-DC module and reduce cost, then device complexity and cost are reduced, but working current requirement increases significantly making high power state difficult to implement
Solution Approach 1:
The power supply is segmented into two independent sources: a power supply module providing voltage and a battery supply module providing current. This segmentation allows each module to specialize - the power supply handles voltage regulation without needing Boost DC-DC complexity, while the battery supply handles high current delivery, resolving the contradiction between simplified structure and high power capability
Solution Approach 2:
The patent merges two power supply sources (power supply module and battery supply module) to work together in a dual power supply mode. The power supply module provides stable voltage while the battery supply module supplements working current, achieving high power output without requiring complex Boost DC-DC conversion circuitry
2Power
If high voltage power supply is used to achieve high power state, then power output is sufficient, but working reliability decreases and Boost DC-DC module is required increasing complexity
Solution Approach 1:
The power supply function is segmented between voltage provision (power supply module) and current provision (battery supply module). This allows the system to achieve high power output through current supplementation rather than high voltage, improving reliability by avoiding high voltage stress on components while maintaining power capability
3Device complexity
If single power management chip is used to simplify power management, then device complexity is reduced, but maximum working current is insufficient for high power state
Solution Approach 1:
The patent combines two independent power supply sources (power supply module and battery supply module) to overcome the current limitation of a single power management chip. The battery supply module acts as a current supplement, enabling the system to achieve high power states without requiring a single complex high-current power management chip
Data Source
AI summary
Disclosed in the present invention is a radio frequency front-end module, comprising at least one driving amplifier and at least one power amplifier. The output end of the driving amplifier is connected to the input end of the power amplifier. The radio frequency front-end module is powered by a power supply when working. When a preset power switching condition is met, the at least one driving amplifier and/or the power amplifier is powered by the power supply and a battery supply. The radio frequency front-end module provided by the present invention can eliminate the limitation of insufficient working current of a power management chip on the overall maximum output power in a low-voltage and high-power working state, and meets the application requirements of the electronic device on an APT mode.