lec25

lec25 - EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 25 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_L25 2 Stability of active device 1 | | , 1 | | < Γ < Γ S L 1 | | , 1 | | < Γ < Γ out in | || | 2 | | | | | | 1 21 12 2 21 12 22 11 2 22 2 11 S S S S S S S S k + = } Stability factor (p. 474) If not unconditionally stable Stable region fM H z =750 H z =1250 Input stability circles Output stability circles f MHz =1250 Input stability circle Output stability circle Unstable region Stable BFG505W or
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EE3113_L25 3 Constant Gain Amplifier Γ ` L =0 Z 0 G S V S G 0 (= 0 ) S 12 G L Z L Γ ` S =0 Γ S Γ L Γ in = S 11 Γ out = S 22 2 22 2 2 21 2 11 2 | 1 | | | 1 | | | 1 | | | 1 L L S S TU S S S G Γ Γ × × Γ Γ = ) ( ) ( ) ( ) ( 0 dB G dB G dB G dB G L S TU + + =
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EE3113_L25 4 Constant gain circles in the SC 2 11 max | | 1 1 S G S = 2 22 max | | 1 1 S G L = ) | | 1 ( | 1 | | | 1 2 11 2 11 2 max S S G G g S S S S S Γ Γ = = ) | | 1 ( | 1 | | | 1 2 22 2 22 2 max S S G G g L L L L L Γ Γ = = normalize ) | | 1 ( | 1 | | | 1 2 2 2 max ii ii i i i i i S S G G g Γ Γ = = This can be written as a circle equation (see page 484 )
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EE3113_L25 5 Circle equation and graphical display 2 2 2
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lec25 - EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture...

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