Polar RF Amplifier Control for Multi-Band Carrier Aggregation
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Solution Overview
Problem
Existing transmission apparatuses for wireless communication require multiple power amplifiers for each carrier frequency band, leading to increased circuit size and costs, and are not compatible with Carrier Aggregation technology for simultaneous multi-band operation.
Innovation Solution
A transmission apparatus that uses a single power amplifier and power supply modulator to amplify RF signals across multiple carrier frequency bands, with the power supply modulation signal set based on the detected power of each band, allowing for simultaneous amplification and reducing the need for band switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power amplifiers are used for each carrier frequency band, then each band can be amplified independently, but the circuit size and costs increase
Solution Approach 1:
The patent implements a single power amplifier that can operate across multiple carrier frequency bands by dynamically adjusting its operating frequency and power supply voltage. The amplifier is designed with a broad frequency range capability, allowing it to serve multiple bands (e.g., Band 1 at 2100MHz and Band 5 at 850MHz) without requiring separate amplifiers for each band, thus reducing circuit size and costs while maintaining independent amplification capability.
Solution Approach 2:
The system dynamically adjusts the operating frequency and power supply voltage of the power amplifier based on which carrier band is currently being transmitted. The control unit changes the frequency and voltage settings in real-time according to the transmission requirements of different bands, enabling a single amplifier to adaptively serve multiple frequency bands with optimal performance for each band.
2Adaptability or versatility
If band switching is implemented for multi-band operation, then multiple bands can be supported, but transmission continuity and speed are reduced
Solution Approach 1:
The patent enables continuous transmission across multiple bands by allowing the power amplifier to operate simultaneously or sequentially without interruption. The amplifier maintains continuous operation by smoothly transitioning between frequency and voltage settings for different bands, eliminating the need for complete transmission stoppage and restart that would occur with traditional band switching, thus maintaining transmission continuity and high productivity.
3Manufacturing precision
If average output power is set low to maintain linearity, then signal distortion is reduced, but power efficiency decreases
Solution Approach 1:
The patent dynamically changes the power supply voltage parameter of the power amplifier based on the transmission requirements of different carrier bands. By adjusting the voltage to optimal levels for each band's characteristics and transmission power requirements, the system maintains signal linearity when needed while maximizing power efficiency, avoiding the constant low-power operation that would be required without dynamic parameter adjustment.
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 configuration reduces circuit size and costs while maintaining high power efficiency and compatibility with Carrier Aggregation technology, enabling simultaneous transmission across multiple bands.
Implementation Method 1
a power amplifier that amplifies the RF signals from the polar modulator
Implementation Method 2
a power supply modulator that modulates the power supply terminal of the power amplifier by a signal obtained by amplifying the power supply modulation signal
Data Source
AI summary
A transmission apparatus of the present invention includes polar modulator (601) that generates a power supply modulation signal and RF signals of a plurality of carrier frequency bands to be transmitted, power amplifier (603) that amplifies the RF signals from polar modulator (601), and power supply modulator (602) that modulates the power supply terminal of power amplifier (603) by a signal obtained by amplifying the power supply modulation signal from polar modulator (601). The power supply modulation signal is set based on a function using, as an argument, the power of the RF signal of each carrier frequency band output from power amplifier (603).