Transcription of RF Power Amplifiers
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RF Power Amplifiers
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 Metrics P1dB: Output Power at which linear gain has compressed by 1dB (measure of linear Power handling) PMAX: Maximum output Power (saturated Power ) Gain: Generally taken to mean transducer gain PAE: Power -added EfficiencyPower delivered to loadPower available from sourcePo
zFor class B fundamental R L,opt = V POS/(I MAX/2) – Didn’t change I D or I C (mA/mm) V DS or V CE (V) I MAX Class A V 2V POS Class B is here! quasi-static In quasi-static picture, resistance presented to transistor output cut in half. But average resistance is the same for class A I MAX /2
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