4 现代无线系统射频电路实用设计卷II

Practical RF Circuit Design for Modern Wireless Systems Volume II Active Circuits and Systems

Active Circuits and Systems

Preface xiii
Acknowledgments xvii
1 Linear RF amplifier design— general considerations 1
1.1 Introduction 1
1.2 Power gain definitions 3
1.3 Neutralization 7
1.4 Unilateral transducer gain 8
1.4.1 Unilateral figure of merit 10
1.4.2 Illustrative example: unilateral gain calculations 12
1.4.3 Amplifier design with single matching networks 13
1.4.4 Unilateral constant gain circles 15
1.4.5 Illustrative example: single-sided amplifier design 15
1.5 RF circuit stability considerations 19
1.5.1 What may cause RF oscillation 22
1.5.2 Stability analysis with arbitrary source and load terminations 25
1.5.3 Two-port stability considerations 30
1.5.4 Stability circles 35
1.5.5 Graphical forms of unconditional stability 40
1.5.6 Graphical forms of potential instability 41
1.5.7 Caution about multistage systems 42
1.6 Stabilizing an active two-port 46
1.6.1 Finding the minimum-loss resistor at the input of the device 47
1.6.2 Broadband stability considerations 49
1.7 Stabilization of a bipolar transistor 50
1.7.1 Examining the effect of lossless feedback 50
1.7.2 Device stabilization 51
1.8 The dc bias techniques 59
1.8.1 Passive dc bias networks 60
1.8.2 Active dc bias circuits 63
1.8.3 Feeding dc bias into the RF circuit 64
1.8.4 The dc bias circuit simulation 65
1.8.5 Filtering of dc bias networks 69
1.9 Statistical and worst-case analyses 69