Dual-Modulation Power Management Circuit for RF Front-End
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile communication devices face increased power consumption and thermal dissipation due to higher output power requirements for RF signals, necessitating efficient power management while also needing compact RF front-end circuitry with dual or multiple modulated power supplies.
Innovation Solution
A dual-modulation power management circuit (PMC) with a single charge-pump and a single power inductor, incorporating tracking amplifiers, a multi-level voltage converter, a low-dropout switch unit, and control units to generate and control modulated voltages, ensuring efficient power distribution and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple charge-pumps and power inductors are used to provide dual modulated power supplies, then power efficiency is improved, but device size increases
Solution Approach 1:
The patent combines multiple charge-pump circuits and power inductors into a single integrated power management circuit that can generate multiple modulated power supplies simultaneously. This merging approach maintains the power efficiency benefits of multiple charge-pumps while reducing the overall device size by eliminating redundant components.
Solution Approach 2:
The power management circuit is designed with multi-functional capability to generate multiple modulated power supplies from a single charge-pump and inductor configuration. The circuit can simultaneously provide different modulated voltages to different power amplifiers, making the single charge-pump system universal enough to replace multiple dedicated charge-pump circuits.
2Speed
If sophisticated power amplifiers are employed to increase output power of RF signals, then data rate is improved, but power consumption and thermal dissipation increase
Solution Approach 1:
The patent employs dynamic voltage modulation through envelope tracking technology, where the power supply voltage dynamically follows the RF signal envelope. This allows the power amplifier to operate at optimal efficiency across varying signal conditions, maintaining high data rates while reducing average power consumption compared to fixed voltage operation.
Solution Approach 2:
The power management circuit changes the voltage parameter dynamically by generating modulated power supplies that adapt to the RF signal characteristics. By adjusting the supply voltage in real-time according to the signal envelope, the system achieves high data rates with reduced power consumption and thermal dissipation.
3Use of energy by moving object
If dual modulated power supplies are provided to improve PA efficiency, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple independent charge-pump circuits and control systems into a single integrated power management circuit. This consolidation reduces device complexity by eliminating redundant components and interconnections while maintaining the capability to provide dual modulated power supplies for improved PA efficiency.
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
The solution enhances power efficiency and reduces size constraints by allowing for dual-modulated power supplies with a single charge-pump and inductor, improving overall performance and user experience in mobile communication devices.
Implementation Method 1
The charge pump is configured to receive a battery voltage and generate a boosted voltage higher than the battery voltage. Herein, an output current based on the boosted voltage is induced toward the first voltage port.
Implementation Method 2
a power inductor coupled between the multi-level voltage converter and the first voltage port. Herein, the power inductor is configured to induce the output current based on the boosted voltage.
Data Source
AI summary
The present disclosure relates to a dual-modulation power management circuit (PMC), which includes a first tracking amplifier coupled to a first voltage port and configured to contribute to a first modulated voltage at the first voltage port, a second tracking amplifier coupled to a second voltage port and configured to contribute to a second modulated voltage at the second voltage port, a charge pump, a power inductor, and a low-dropout (LDO) switch unit. Herein, the power inductor is configured to induce an output current, which is based on a boosted voltage generated by the charge pump, toward the first voltage port. A first portion of the output current is eligible to flow through the LDO switch unit from the first voltage port to the second voltage port. The first modulated voltage is not smaller than the second modulated voltage over time.