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Broadband opamps for multi-channel communication systems make strong demands on linearity performance. This book, written for Analog CMOS designers, presents a thorough analysis of the nonlinear behaviour of circuits, to obtain opamps with low distortion.
List of contents
List of Figures. List of Tables. Symbols and Abbreviations. Foreword. Preface. Acknowledgement. 1: Introduction. 1.1. Motivation. 1.2. Earlier Work. 1.3. Design Issues for Low Nonlinear Distortion. 1.4. Outline. 1.5. Summary. 2: Specification and Analysis of Nonlinear Circuits. 2.1. Linearity Specifications. 2.2. Volterra Series. 2.3. Phasor Method. 2.4. Concluding Remarks. 3: Biasing and Opamp Modeling for Low Distortion. 3.1. Biasing for Robust Linearity Performance. 3.2 Opamp Modeling for Nonlinear Analysis. 4: Nonlinear Analyzes of Feedback Miller Opamp. 4.1. The Non-Inverting. 4.2. The Inverting Configuration. 4.3. Concluding Remarks. 5: Opamp Circuits with High Linearity Performance. 5.1. Measurement System. 5.2. A 1.8V CMOS Opamp with -77.5dB HD2 and HD3 at 80MHz. 5.3. A 3.3V CMOS Opamp with -80dB HD3 at 80 MHz. 5.4. A 3.3V CMOS Current Opamp with -63dB HD3 at 100MHz. 5.5. A 3.3V CMOS Unity-Gain Opamp with -80dB HD3 at 10MHz. 5.6. Concluding Remarks. 6: Conclusions and Discussions. 6.1. Opamp Topologies Versus Linearity. Appendix A:Transistor Model. Appendix B: Closed Loop Opamp Transfer Functions. Appendix C: Open Loop Opamp Transfer Functions.
Summary
Broadband opamps for multi-channel communication systems have strong demands on linearity performance. When these opamps are integrated in deep sub-micron CMOS technologies, the signal-swing has to occupy a large part of the rather low supply voltage to maintain the signal-to-noise-ratio. To obtain opamps with low distortion it is necessary to do a thorough analysis of the nonlinear behaviour of such circuits and this is the main subject of Design Criteria for Low Distortion in Feedback Opamp Circuits.
The biasing of each transistor in the circuit is a major issue and is addressed in this work. It is important to bias the transistor such that the distortion is low and stable in the entire range of its terminal voltages. This will ensure high linearity and robustness against variations in circuit conditions such as power supply voltage, bias current and process variations.
Design Criteria for Low Distortion in Feedback Opamp Circuits is written for .
