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RF Power Amplifiers - MIT OpenCourseWare

The World Leader in High-Performance Signal Processing SolutionsRF IFRF Power AmplifiersMay 7, 20032RF IFOutline PA IntroductionzPower transfer characteristicszIntrinsic PA metricszLinear and Non-linear amplifierszPA Architectures Single-Stage Linear PAzLoad-line theoryzTransistors size zInput and Output MatchingzSo why is this so hard? High-efficiency PAszClass A, AB, B and C amplifiers3RF IFOutline (cont.) Real-World Design ExamplezSelecting architecture, number of stageszDesigning stageszTuning: inter-stage match and output System specificationszRuggedness: load mis-match and VSWRzLinearity: spectral mask (ACPR), switching transientszNoise in receive band Power Control4RF IFPA Transfer characteristicsDefining linearity:G01 Pin(dBm)Pout(dBm)Pout= Pin+ Glinearnon-linear (actual)5RF IFPA Transfer characteristicsDefining linearity:Gain (dB)Pin(dBm)Pout(dBm)G-1P1dBPMAX6RF IFPA Introduction: Intrinsic PA M

1dB: Output power at which linear gain has compressed by 1dB (measure of linear power handling) ... Energy stored in reactive elements delivers current to the load during transistor off-portion of cycle. 24 RF IF High-Efficiency PAs

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