| In order to meet people's increasing communication demands,wireless communication systems use higher and higher frequencies,and signal modulation techniques are constantly enriched.Communication equipment is required to provide better performance.As the core module in the radio frequency communication system,the power amplifier greatly affects the overall performance of the system.Therefore,in order to improve the performance of the transceiver system,in-depth research on power amplifiers is imperative.This thesis first introduces the current research on power amplifiers by domestic and foreign researchers,finds out the current demand for power amplifiers,and determines the direction and content of this topic.Then it introduces the basic principles of class F,continuous B/J,and continuous inverse F working modes and loadpull technology in detail.Based on these theoretical analyses,further solutions are proposed for the current needs of power amplifiers,and the design,processing and testing of three power amplifiers and the design of a microwave monolithic integrated circuit(MMIC)power amplifier are completed:(1)High-efficiency class F power amplifier with a simplified output matching structure is proposed.No additional microstrip lines are needed.Second harmonic control and third harmonic control can be achieved by reusing the drain bias microstrip line and the fundamental wave matching microstrip line.The test results show that in the frequency range of 1.5GHz to 2.4GHz,the output power is between 40.6d Bm and 41.6d Bm,the drain efficiency is between 69% and 81%,and the gain is between 10.5d B and 11.5d B.(2)A new voltage time-domain waveform formula is proposed for continuous class B/J power amplifiers.This formula shows that it is possible to expand the impedance space,increase the flexibility of impedance matching,and expand the bandwidth while maintaining the power and efficiency of the traditional continuous class B/J power amplifier,without having to pay the price of reducing power or efficiency.The test results show that in the frequency range of 1.5GHz to 2.5GHz,the output power is between 40.6d Bm and 41.9d Bm,the drain efficiency is between 72.4% and 79.1%,and the gain is between 10.6d B and 11.9d B.(3)A new current time-domain waveform formula is proposed for continuous inverse class F power amplifiers.This formula shows that it is possible to expand the impedance space,increase the flexibility of impedance matching,and expand the bandwidth while maintaining the power and efficiency of the traditional continuous inverse class F power amplifier,without having to pay the price of reducing power or efficiency.Based on this combined with Doherty technology,a power amplifier is designed and produced.The test results show that in the working frequency range of1.8GHz to 2.4GHz,the saturated drain efficiency is 66% to 71.7%,when the power is backed by 6d B,the efficiency is between 48.6% and 57.1%,and the saturated output power is about 43.5d Bm to44.3d Bm.(4)A high-power MMIC amplifier is designed using Ga N HEMT technology.The final simulation result of the power amplifier is that from 37 GHz to 42 GHz,the output power is between30.6d Bm and 31.8d Bm,the gain is between 15.6d B and 16.8d B,and the power added efficiency is between 10.8% and 12.7%. |
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