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lec22 - (which are typically small and Conduction losses α...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 22 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01609 copyright © 2003, R. Ludwig Copyright, 1998 © R. Ludwig
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EE3113_L22 2 Microstrip line Matching Networks Most commonly used in RF circuits Can be used up to approximately 20 GHz (for TEM modes) Microstrip lines require typically 6 parameters – dielectric constant ε r – PCB board height h , strip width w , thickness t – resistivity ρ and loss tangent d
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EE3113_L22 3 Key parameter designations ε r , d w t h ρ ??? 0 = + + = C j G L j R Z ω ω Don’t use:
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EE3113_L22 4 Please keep in mind, there are two issues A) phase velocity and B) characteristic impedance: eff r p c c v ε ε → = 1 / ) 4 1 8 ln( 60 0 0 + = → h w h w w h Z Z eff ε 1 / ) 444 . 1 / ln( 667 . 0 393 . 1 / / 120 60 0 + + + = h w h w h w Z eff eff ε π ε Numerical evaluation (Textbook, pages 64 - 69): Z 0 ( ε r )=F 1 (w/h) and ε eff ( ε r )=F 2 (w/h)
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EE3113_L22 5 Microstrip lines have two sources of losses z c d e Z V z P ) ( 2 0 2 | | 2 1 ) ( α α + + + = Dielectric losses
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Unformatted text preview: (which are typically small) and Conduction losses α c (which can be significant) Depending on frequency, one may have to deal with radiation losses as well! EE3113_L22 6 Classes of amplifier operation I C V BE Cut-off region Quiescent point V * Linear region Ideal transfer function Input waveform Output waveform I C V BE Quiescent point Θ =180 o I C V BE Quiescent point I C V BE Quiescent point Class A Class B Class AB Class C EE3113_L22 7 Efficiency of an amplifier % 100 S RF P P Power Source Power RF = = η I L I Θ Θ π 2 π 3 π Current through load I S I Q + I Θ Θ π 2 π 3 π I Q Θ /2 Current from the power supply EE3113_L22 8 )] 2 / sin( 2 ) 2 / cos( [ 2 sin Θ − Θ Θ Θ − Θ − = η Conduction angle, Θ o Efficiency , % η =78.5% Θ =180 o Class B Class A Class AB Class C...
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  • Fall '06
  • Scalzo
  • class a, Printed circuit board, ground plane, Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, IC Quiescent point

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