RF Power Amplifier Circuit With Adjacent Channel Leakage Correction
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Solution Overview
Problem
Portable wireless communication devices face challenges in miniaturization due to high power consumption in radio frequency (RF) power amplifiers, which affects battery life and signal quality over wide output power and frequency ranges.
Innovation Solution
The implementation of a radio frequency (RF) system with phase shift and gain control single chip circuits, power amplifier single chip circuits, and antennas, which split and amplify RF signals to improve signal quality and reduce power consumption through phase and gain adjustments and adjacent channel leakage correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power amplifiers are designed to provide high transmission power for longer distances and broader frequencies, then transmission coverage and frequency range are improved, but power consumption increases
Solution Approach 1:
The power amplifier is divided into multiple parallel power amplifier circuits (first, second, third, and fourth PAs) that can be independently controlled. This segmentation allows the system to activate only the necessary number of amplifier circuits based on current transmission requirements, reducing overall power consumption while maintaining the capability for high transmission power when needed.
Solution Approach 2:
The system dynamically adjusts the operation state of individual power amplifier circuits based on real-time signal requirements. The controller selectively activates or deactivates specific PA circuits depending on the number of active communication channels, enabling adaptive power management that optimizes energy efficiency across varying transmission conditions.
2Use of energy by moving object
If multiple power amplifiers are arranged in parallel to reduce power consumption, then power efficiency is improved, but signal quality and linearity deteriorate over wide output power and frequency ranges
Solution Approach 1:
Each power amplifier circuit is equipped with dedicated phase shifters and gain controllers that independently adjust the phase and amplitude of signals specific to that circuit. This localized control ensures that each PA contributes optimally to the combined output, maintaining signal linearity and quality across the wide output power range even when multiple PAs operate in parallel.
Solution Approach 2:
The system employs feedback mechanisms where the output signals from multiple power amplifiers are combined and monitored. The controller adjusts the phase and gain of individual PA circuits based on feedback information, ensuring that the combined output maintains high signal quality and linearity across varying power levels and frequency ranges.
3Adaptability or versatility
If transmission power is increased for broader frequency ranges, then frequency coverage is improved, but adjacent channel leakage increases
Solution Approach 1:
Each power amplifier circuit has dedicated phase shifters that independently adjust the phase of signals in specific frequency channels. This localized phase control allows precise manipulation of signal characteristics for each PA, enabling the system to suppress adjacent channel leakage while maintaining broad frequency coverage through coordinated operation of multiple PAs.
Data Source
AI summary
A radio frequency (RF) system is described for use in a wireless communication device. The RF system may contain power amplifiers, additional circuitry and components (e.g., gain controllers, phase shifters), and/or antennas. The RF system is described in a variety of different configurations with its functionality divided up over several single chip circuits. Using the single chip circuits simplifies assembly, reduces size, and allows for high speed RF performance demanded by fixed and mobile wireless standards. The system may use a first amplifier circuit combined with an adjacent channel leakage correction circuit so that the output of the first amplifier has the signal leakage substantially cancelled.