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)

limiter high efficiency power amplifier RF output peak detector RF input D A D A D A amplitude information phase i nformatio modulator RF output high efficiency power amplifier digital signal processor local oscillator supply voltage amplifier I Q I Q di gi ta l b a s e band i npu t. 48 EER (Envelope ... “RF Power Amplifiers for Wireless ...

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