Lect3_Impedance Transformation & Matching Networks

Lect3_Impedance Transformation & Matching Networks -...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
ECE 894 RF and mmWave Front-end Circuit Design Prof. Waleed Khalil Lecture Impedance Transformation & Matching Networks 3 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Parallel vs. Series Resonance Circuit 2 i R p L C i L i C v + - Y in v R s L C v L i C i + - Z in + - v C Parallel RLC Series RLC ( ) , , , 1 Real o o o p stored po loss L C LC o p in p R E Q PX L ZZ C i Qi Y R ω = = = = = = ( ) , , Real oo o o s s CLo p in s X Q R L ZZZ C v Qv ZR ωω = = = = = 1 o LC ω=
Background image of page 2
Ideal vs. Non Ideal L,C 3 Ideal L,C Real L,C L C R s L s R s C s p p p R Q L ω = p ss Q LR = s p s R Q C = p pp Q CR = C p R p L p R p
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Generalized Serial-Parallel Transformation 4 R s X s R p X p 2 22 2 2 2 2 : for 1 1 , for 1 1 1 pp ss p sp p jR X R jX R jX X RR Q XR QQ RX XX X Q Q += +  = =  ++  = = + +
Background image of page 4
Voltage Gain vs. Power Gain 5 Voltage Gain, A v Power Gain, G p dB V V A i o v log 20 = dB R R dB A dB R V R V G o i v i i L o p log 10 ) ( / / log 10 2 2 + = = R s =R i RF Block A v , G p V i R i, P i R L =R o V o P L R o V s
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Matching and Power Loss 6 1V rms P L =1 2 /50=0.02W 50 2V rms 50 Source Load 2/3V rms P L =(2/3) 2 /25=0.0178W 25 2V rms 50 1.6V rms P L =1.6 2 /200=0.0128W 200 2V rms 50 Reflection Loss= (0.02-0.0178)/0.02=11% Power loss=10log(1-0.11)=-0.5dB Reflection Loss= (0.02-0.0128)/0.02=36% Power loss=10log(1-0.36)=-1.9dB
Background image of page 6
Return Loss Ideally, the load impedance Z L is matched to the source or the feed line impedance Z o No reflection for ideal match (i.e. RL= - dB)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 17

Lect3_Impedance Transformation & Matching Networks -...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online