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High efficiency switching power amplifier Research and Design

Author: HouLei
Tutor: FengQuanYuan
School: Southwest Jiaotong University
Course: Information Manufacturing Engineering
Keywords: Switching power amplifier Traction load Power added efficiency High efficiency
CLC: TN722.75
Type: Master's thesis
Year: 2009
Downloads: 130
Quote: 0
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Abstract


Modern wireless mobile network base station system in the transmission signal to the mobile terminal consumes large amounts of energy efficiency of the system more and more attention, especially as a base station system at the end of the power amplifier, the traditional linear power amplifier has a very low energy transmission efficiency, and poor efficiency of power transfer directly affects the operating costs of the entire system, resulting in heat dissipation, so the designer has the power amplifier linearity and a trade-off between efficiency. Switch mode power amplifier compared to the traditional linear mode power amplifier can provide higher efficiency. This article first class F power amplifier circuit according to structural features of the theoretical analysis, F class amplifier with output harmonic suppression network transistor drain voltage or current to control the harmonic components, boil transistor drain voltage waveform or current waveform, so they do not overlap, reducing switching losses and improve the efficiency of the power amplifier class F amplifier at the fundamental frequency and harmonic frequencies properly designed so that the load terminal output amplifier power added efficiency, output power and gain significant aspects increased. Then given by LC matching circuit design output third-order harmonic suppression network simulation software from Agilent (Agilent Design Systems) measured traction load amplifier tube output and input impedance of the best, and then make use of the output and input matching smithchart network, and ultimately design a working frequency of 3.5GHz F-class power amplifier. Simulation results 28dBm input power, the output power of 37.7dBm, the power added efficiency compared to 69.4%, harmonic distortion is well suppressed, efficiency is improved. Next, the proposed use of harmonic suppression alternative output matching network design methods, the design of a omit the output matching, using harmonic suppression output matching network itself play a role in the 900MHz class F power amplifier with load-pull method to determine the most good input and output impedance, the standing wave ratio (VSWR) equal to 1 as the optimization targets to control the output of the harmonic LC network parameters as the optimization parameter for optimization of the circuit to obtain a second and third network, the network inductance and capacitance values , omit the output matching, simplifying the circuit structure, also reached the purpose of increasing efficiency, the simulation results for the output power of 34dBm, the power added efficiency of 67%, well improved power amplifier efficiency.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Amplification technology,the amplifier > Amplifier > Amplifiers: the role of sub- > Power amplifier
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