Multiband Envelope Tracking Amplifier With Segmented Power Supplies
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Solution Overview
Problem
Existing communication systems face challenges in providing efficient envelope tracking for power amplifiers due to the high complexity and cost of wide-band switching power supplies required for multiple carriers, which results in reduced system efficiency and less accurate drain modulation.
Innovation Solution
A multiband envelope tracking power amplifier system utilizing multiple narrow-banded power supplies, each generating power at distinct center frequencies, coupled through a digital predistorter to provide separate bands of modulation signals, achieving a multiband power modulation output that enhances accuracy and reduces complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single wide-band switching power supply is used to provide envelope tracking for multiple carriers, then the power amplifier can maintain efficiency across multiple bands, but the device complexity and cost increase substantially
Solution Approach 1:
The patent divides the wide-band power supply into multiple narrow-band power supplies, each dedicated to a specific frequency band. This segmentation reduces the complexity of each individual power supply while collectively covering the required multi-band spectrum, directly resolving the contradiction between maintaining envelope tracking efficiency and reducing device complexity
2Adaptability or versatility
If a single power supply covers a large cavity filter response for multiple bands, then both bands can be supported, but the bandwidth requirements double the instantaneous bandwidth which increases cost substantially
Solution Approach 1:
Instead of using one power supply to cover the entire multi-band spectrum simultaneously, the patent segments the spectrum into multiple bands, each handled by a dedicated narrow-band power supply. This approach maintains adaptability for multi-band support while reducing the bandwidth requirement of each individual power supply component
3Adaptability or versatility
If widely spaced carriers are used in a wide-band configuration, then more frequency bands can be supported, but the efficiency of the switching power supply is depressed
Solution Approach 1:
The patent applies local quality by optimizing each narrow-band power supply for its specific frequency band characteristics. Each power supply is tuned to operate most efficiently at its designated band, ensuring that even with widely spaced carriers, the efficiency loss is minimized compared to a single wide-band power supply attempting to cover all bands
Data Source
AI summary
An apparatus relates generally to multiband power modulation. In such an apparatus, there is a first power supply and a second power supply. The first power supply and the second power supply are each narrow-banded. A digital predistorter is coupled to provide separate bands of a modulation signal for respective input of a first band of the bands to the first power supply and a second band of the bands to the second power supply. The first power supply generates a first power at a first center frequency. The second power supply generates a second power at least at a second center frequency spaced apart from the first center frequency for a wide-band configuration. The second power output from the second power supply is coupled to the first power output from the first power supply to provide a multiband power modulation output.