COMM ELECTRONICS ECE 218A
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This 10 page Class Notes was uploaded by Spencer Ondricka on Thursday October 22, 2015. The Class Notes belongs to ECE 218A at University of California Santa Barbara taught by M. Rodwell in Fall. Since its upload, it has received 51 views. For similar materials see /class/227039/ece-218a-university-of-california-santa-barbara in ELECTRICAL AND COMPUTER ENGINEERING at University of California Santa Barbara.
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Date Created: 10/22/15
ECE145a 218a Power Gain Definitions Mark Rodwell University of California Santa Barbara rodweeceucsbedu 8058933244 8058933262 fax class notes M Rodwell copyrighted 2009 Available Source Power 2 W P 2 gm S generator avg 4 gen PM is delivered to Z L iff Z L ngm V g 2 2 R1 d Pload I load Rload i Vgen 0a den Zload nge 4Rgeanoad 4Rgeanoad 2 avg 4Rgen Hng Zload i den Zload Key point we can consider either power available or power actually delivered cass Hales M Rudw all mpyrrghled 2009 Illlllll 8 quotHillquot Power Transler Will a 2110 Connection between generator amp ampli er We can consider either PaVg power available from generator enerator am li er load Pm power absorbed by ampli er 1nput g p V gen Connection between ampli er amp load We can consider either PM power available from ampli er output PL power absorbed by load Ratios of output to input power de ne power gains There are consequently at least 4 different power gain de nitions All are used as tools during ampli er design class notes M Rodwell copyrighted 2009 PDWBI Gain Ilelinitions Summarv Transducer Gain Available Gain Insertion Gain ZSZO zLz Vgen Vgen GT Plead Pavgen GA Pan5 Pavgen 5 21 2 Pang Pavgen load power power available from ampli er power delivered to Z load power available from generator power available from generator 2 power available from Z generator 2 general case gain 2 gain with outputmatched gain in a 50 Ohm enviroment Operating Gain Maximum Available Gain After impedancematching I 39 39 39 39 39 39 39 39sij matched quotquotquot 39 39 ZSZO ZLZO 39 G P P GP Pload Pgendelivered Max ava gendeltvered power available from ampli er load power 2 S 2 G power delivered from generator power available from generator 21matched maxraw gain with input matched 2 gain with both ports matched S1 mehed Szzmmhed 0 MAGmay not exist but only if unconditionaly stable cass Hales M Rudw ell mpyrrghled 2009 Twas oi 2Ports To consider The 2 port might be a transistor Vgequot Z Valr neitherSHnorSzz0 S The 2 port might be a transistor with matching built in S11 amp 522 close or equal to zero The 2 port might be a general ZS 0m amplifier with arbitrary SI 1 ll For all of these we could choose to add additional matching networks at the generator and at the load Mass notes M Rodwel copwgmeamg Insertion Power Gain From S parameter properties S Km 21 2 83quot Z ZLZO gen But if 2W 20 gt P lVg 2 420 avgen en 220 And if ZL 20 gt PM Vvout gtP P load auger Km en 2 1521u2 but only if 2W 2L 20 2 4 Vg hence S21 2 2 power Fielwered to Z load 2 gain in a Z 0 50 Ohm enVironmert power avarlable from Z 0 generator cass Hales M Rudw all mpyrrghled 2009 TI EIIISIIIIGBI POWBI liain GT 13101151 avgen power delivered to load power available from generator general case gain Ampli er input impedance might or might not be matched to Z some Z gen Ampli er output impedance might or might not be matched to Z ma Generator impedancemight or might not be Z 0 Load impedancemight or might not be Z0 GT depends upon both andZL cass mazes M Rudw all mpyngmw 2009 GP 2 13101151 gen delivered load power power delivered from generator Note Plow P gen delivered 2 PlowP GT iff den 2 avg hence G p gain with input matched Ampli er input impedance is matched to Z some Z gen Ampli er output impedance might or might not be matched to Z Dad Generator impedancemight or might not be Z 0 Load impedancemight or might not be Z0 GP depends upOn but not upon Z S cass Hales M Rudweu cnpyrrghled 2009 GAP P ava avgen power available from amplifier power available from generator NoteP P P P 1sz avg 2 load avg 2 GT iff 2W Z hence Ga gain with output matched out Amplifier input impedance might or might not be matched to Z Z source gen 39 Amplifier output impedance is matched to Z m d Generator impedancemight or might not be Z 0 Load impedancemight or might not be Z 0 G A depen39dsgupon Z S but not upon Z L