Hybrid-Coupled High-Frequency Power Amplifier for Wideband Efficiency
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Solution Overview
Problem
High frequency power amplifiers in wireless communication suffer from power consumption issues and frequency-dependent load impedance variations due to signal leakage, which hinder achieving wideband characteristics and efficient power-added efficiency.
Innovation Solution
A high frequency power amplifier design incorporating a hybrid coupler, input signal splitter, peak and carrier amplifiers, and combiner, where the load impedances of the peak amplifiers vary based on the current level from the carrier amplifier, reducing signal leakage effects and maintaining linearity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a real hybrid coupler is used in a sequential LMBA, then signal leakage from the peak amplifier to the carrier amplifier output node occurs, but this causes load impedance of the carrier amplifier to vary complexly and degrades frequency characteristics
Solution Approach 1:
The patent introduces an intermediary mechanism (load impedance variation control) to manage the harmful signal leakage. By allowing the load impedance of the carrier amplifier to vary in a controlled manner based on the output power level, the system compensates for the detrimental effects of signal leakage and maintains excellent frequency characteristics across the operating band.
Solution Approach 2:
The patent implements dynamic load impedance adjustment for the carrier amplifier. The load impedance is made variable rather than fixed, changing according to the output power level to counteract the frequency-dependent effects of signal leakage from the peak amplifier, thereby maintaining consistent frequency characteristics throughout the bandwidth.
2Power
If the carrier amplifier is designed to operate at high power levels, then output power increases, but load impedance variations become frequency-dependent and wideband characteristics become difficult to achieve
Solution Approach 1:
The patent changes the operating parameters of the carrier amplifier dynamically. By adjusting the load impedance parameter according to the output power level, the system maintains optimal performance across different power levels and frequencies, enabling both high output power and wideband characteristics to coexist.
3Use of energy by moving object
If power-added efficiency is increased through load modulation techniques, then energy consumption improves, but load impedance becomes complex and difficult to control across wide bandwidth
Solution Approach 1:
The patent segments the amplifier system into distinct functional components with specific roles. The carrier amplifier and peak amplifier are separated with clearly defined functions, and the load modulation is applied selectively to the carrier amplifier. This segmentation simplifies the overall control complexity while maintaining high power-added efficiency.
Data Source
AI summary
A hybrid coupler includes a first port, a second port, a third port, and a fourth port. An input signal splitter splits a first input signal at a high frequency into two second input signals. A peak amplifier includes two first amplifiers. The two first amplifiers amplify two high frequency signals obtained by splitting a first one of the second input signals, and output ends of the two first amplifiers are coupled to the first port and the second port. A carrier amplifier includes two second amplifiers and a combiner. The two second amplifiers amplify two high frequency signals obtained by splitting a second one of the second input signals. The combiner combines the high frequency signals amplified by the two second amplifiers together and inputs a combined high frequency signal to the third port.