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RF Power Amplifier Design

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RF Power Amplifier DesignMarkus Mayer & Holger ArthaberDepartment of Electrical Measurements and Circuit DesignVienna University of TechnologyJune 11, 20012Contents~Basic Amplifier ConceptszClass A, B, C, F,hHCAzLinearity AspectszAmplifier Example~Enhanced Amplifier ConceptszFeedback, Feedforward, ...zPredistortionzLINC, Doherty, EER, ...3Efficiency Definitions~Drain Efficiency:~ Power Added Efficiency: DCOUTDPP= = =GPPPDDCINOUTPA11 4Ideal FET Input and Output Characteristics0VGSIDSIm2VPVPVDSmaxVDDVK VDS0V=VGSPV=0GSOhmicSaturationBreakdowng mDDKDDVVV = 5Maximum Output Power Match0VGSIDSIm2VPVPVDSmaxVDDVKVDS0V=VGSP V=0GSOhmicSaturationBreakdowngmmKDSOPTIV VR =max6Class A0VGSIDSIm2VPVPVDSmaxVDDVKVDS0VGSVDS2ppQ IDSIm02ppQ7Class A Circuit VDDRLDGS48%dB) 14 ( 50%PA == = ADGG8Class B0VGSIDSIm2VPVPVDSmaxVDDVKVDS0VGSVDS2ppQ IDSIm02ppQ9Class C0VGSIDSIm2VPVPVDSmaxVDDVKVDS0VGSVDS2ppQ IDSIm02ppQ10Class B and C Circuit VDDRLDGSf0Class BClass C%65dB) (8 6dB-%78PA == = ADGG%01%100PA GD11Influence of Conduction Angle12Class F ( harmonic controlled Amplifier )0VGSIDSIm2VPVPVDSmaxVDDVKVDS0V GSVDS2ppQIDSIm02ppQ13hHCA(halfsinusoidal lydriven HCA)0VGSIDSIm2VPVPVDSmaxVDDVKVDS0VGSVDS2 ppQIDSIm02ppQ14Class F andhHCA Circuit VDDRLVDSID Ze(n)0, n=eveninf, n=even Zo(n)0, n=1inf, n=oddClass FhHCA%87dB)

Amplifier Design – Simulation ~Dynamic Load Line & Power Sweep 0 3 6 9 12 15 Voltage (V) Dynamic load line-2000 0 2000 4000 6000 8000 IVCurve (mA) IV_Curve Dynamic Load Line (mA) Amp 0 5 10 15 20 24 Power (dBm) Power Sweep 1 Tone 0 10 20 30 40 0 10 20 30 40 50 60 70 80 Output Power (L, dBm) Amp PAE (R) Amp

  Design, Power, Simulation, Amplifier, Rf power amplifier design

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