Microwave Transistor Amplifiers Analysis and Design

Contents

iv

Field Effect Transistors, 79

Problems, 86 2

MATCHING NETWORKS AND SIGNAL FLOW GRAPHS

2.1 2.2 2.3 2.4 2.5

92

Introduction, 92 The Smith Chart, 93 .The Normalized Impedance and Admittance Smith Chart, 105 Impedance Matching Networks, 112 Microstrip Matching Networks, 141 Microstrip Lines, 141 Design of Matching Ne!works, 152

2.6

Signal Flow Graphs and Applications,

175

Applications of Signal Flow Graphs, 180

2.7

Power-Gain Expressions: Alternate Derivations, 185 Power-Gain Expressions in Terms of Sp parameters, 192

2.8 3

VSWR Calculations, 194 Problems, 200

MICROWAVE TRANSISTOR AMPLIFIER DESIGN

3.1 3.2 3.3 3.4

3.5 3.6 3.7

Introduction, 212 Power Gain Equations, 213 Stability Considerations, 217 Constant-Gain Circles: Unilateral Case, 228 Unconditionally Stable Case, ISi;1 < 1, 231 Potentially Unstable Case, ISi;1 > 1, 234 Unilateral Figure of Merit, 238 Simultaneous Conjugate Match: Bilateral Case, 240 Operating and Available Power-Gain Circles, 247 Operating Power-Gain Circles, 247 Unconditionally stable bilateral case, 247 Potentially unstable bilateral case, 252 Available Power-Gain Circles, 257 Unconditionally stable bilateral case, 257 Potentially unstable bilateral case, 260

3.8 3.9

Constant VSWR Circles, 260 DC Bias Networks, 273 BIT Bias Networks, 273 GaAs FET Bias Networks, 280

Problems. 283

212