power_gains

power_gains - class notes, M. Rodwell, copyrighted 2009...

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class notes, M. Rodwell, copyrighted 2009 ECE145a / 218a Power Gain Definitions Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
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class notes, M. Rodwell, copyrighted 2009 Available Source Power vs Power Actually Delivered 2 ) ,( Power Source Available RMS gen vg V P = generator load * iff to delivered is 4 gen L L avg gen avg Z Z Z P R = Rgen Xgen Xload Rload load To elivered Actually D Power Vgen 2 2 2 load gen load gen load load load Z Z R V R I P + = = 2 2 2 4 4 4 load gen load gen avg load gen load gen gen gen Z Z R R P Z Z R R R V + = + = delivered actually power or available, power either consider can we : point Key
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class notes, M. Rodwell, copyrighted 2009 Input & Output Power Transfer with a 2-port : either consider can We : amplifier & generator between Connection input. amplifier by absorbed power generator, from available power = = in avg P P ther nsider n e load & amplifier between Connection load. by absorbed power output, amplifier from available power : either consider can We = = L ava P P gains. power define power input output to of Ratios efinition ain ower ifferent ast at nsequent e here s. definition gain power different 4 * * least *at * ly consequent are There design. amplifier during * tools * as used are All
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class notes, M. Rodwell, copyrighted 2009 Power Gain Definitions: Summary ransducer Gain vailable Gain sertion Gain Transducer Gain Z L Z s S ij Available Gain Z s S ij Z L =Z out * S ij Z s =Z o Z L =Z o Insertion Gain Vgen enerator om vailable ower power load / , = = gen av load T P P G enerator om ailable ower amplifier from available power / , , = = gen av a av A P P G Vgen Vgen load to delivered power / , , 2 21 = = o gen av a av Z P P S gain case - general generator from available power = matched output with gain generator from available power = enviroment Ohm 50 a in gain generator from available power = o Z S ij,raw Z s =Z o Z L =Z o match match S ij,matched Z s =Z in * S ij Z =Z * Operating Gain Z s =Z in * S ij Maximum Available Gain After impedance-matching: Vgen Vgen L out Z L Vgen power load / , = delivered gen load P P P G enerator om vailable ower amplifier from
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power_gains - class notes, M. Rodwell, copyrighted 2009...

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