Structured Analog CMOS Design

ISBN-13: 9789048179152 / Angielski / Miękka / 2010 / 283 str.

Danica Stefanovic; Maher Kayal

Opis

Structured Analog CMOS Design describes a structured analog design approach that makes it possible to simplify complex analog design problems and develop a design strategy that can be used for the design of large number of analog cells. It intentionally avoids treating the analog design as a mathematical problem, developing a design procedure based on the understanding of device physics and approximations that give insight into parameter interdependences. The basic design concept consists in analog cell partitioning into the basic analog structures and sizing of these basic analog structures in a predefined procedural design sequence. The procedural design sequence ensures the correct propagation of design specifications, the verification of parameter limits and the local optimization loops. The proposed design procedure is also implemented as a CAD tool that follows this book.

Spis treści

1 Introduction. 1.1 The objectives of this work. 1.2 Structured analog design. 1.3 Transistor-level design based on the device inversion level. 1.4 CAD tools for analog design assistance. 1.5 Practical design example. 1.6 Book organization. 2 Transistor level design. 2.1 MOS transistor model. 2.2 Transistor design parameters. 2.3 Design approach. 2.4 Conclusion. Bibliography. 3 BSIM to EKV conversion. 3.1 Motivation and purpose. 3.2 Conversion concept. 3.3 BSIM versus EKV, the fundamental differences and the conversion algorithm guidelines. 3.4 Conversion algorithm. 3.5 Conversion results. 3.6 Conclusion. 3.7 Download. Bibliography. 4 Basic analog structures. 4.1 Introduction. 4.2 Basic analog structures’ library. 4.3 Structured design approach. 4.4 Transconductance structures. 4.5 Load structures. 4.6 Bias structures. 4.7 Conclusion. Bibliography. 5 Procedural design scenarios. 5.1 Introduction. 5.2 Procedural design scenario for a folded-cascode OTA. 5.3 Procedural design scenario for a fully-differential folded cascode OTA. 5.4 Procedural design scenario for a Miller operational amplifier. 5.5 Conclusion. Bibliography. 6 PAD tool. 6.1 Introduction. 6.2 PAD structure. 6.3 Basic analog structures’ library. 6.4 Procedural design scenarios. 6.5 BSIM and EKV model library file input. 6.6 Conclusion. 6.7 Download. Bibliography. 7 Topology variants. 7.1 Basic concept. 7.2 Gain enhancement - two stages. 7.3 Gain enhancement - gain boosting. 7.4 Input common-mode range enhancement – complementary differential pair. 7.5 Differential input range enhancement - linearized differential pair. 7.6 Rejection of the differential signal in a common-mode signal - cascoded current bias sources. 7.7 CMFB stability improvement - split bias sources. 7.8 Conclusion. Bibliography. 8 Practical example: the design of analog amplifiers in the Delta-Sigmamodulator system. 8.1 Delta-Sigma modulator system. 8.2 Derivation of the testbench. 8.3 Topology selection. 8.4 Design of the fully-differential high-gain amplifier. 8.5 Design of the fully-differential difference amplifier. 8.6 Design of the fully-differential two-stage amplifier. 8.7 Conclusion. Bibliography. Index.

Blurb

Structured Analog CMOS Design describes a structured analog design approach that makes it possible to simplify complex analog design problems and develop a design strategy that can be used for the design of large number of analog cells. It intentionally avoids treating the analog design as a mathematical problem, developing a design procedure based on the understanding of device physics and approximations that give insight into parameter interdependences.

The proposed transistor-level design procedure is based on the EKV modeling approach and relies on the device inversion level as a fundamental design variable. Since all important design parameters can be expressed as continuous functions of the device inversion level, the design optimum as well as the technology limits can be easily found.

The basic design concept consists in analog cell partitioning into the basic analog structures and sizing of these basic analog structures in a predefined procedural design sequence. The procedural design sequence ensures the correct propagation of design specifications, the verification of parameter limits and the local optimization loops. The proposed design procedure is also implemented as a CAD tool that follows this book.

Finally, as a practical example, the design of analog amplifiers in a hybrid multi-bit Delta-Sigma modulator system is described in detail from system level to transistor level.