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18
Optimal design of a CMOS opamp via geometric programming
 IEEE Transactions on ComputerAided Design
, 2001
"... We describe a new method for determining component values and transistor dimensions for CMOS operational ampli ers (opamps). We observe that a wide variety of design objectives and constraints have a special form, i.e., they are posynomial functions of the design variables. As a result the ampli er ..."
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Cited by 78 (10 self)
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We describe a new method for determining component values and transistor dimensions for CMOS operational ampli ers (opamps). We observe that a wide variety of design objectives and constraints have a special form, i.e., they are posynomial functions of the design variables. As a result the ampli er design problem can be expressed as a special form of optimization problem called geometric programming, for which very e cient global optimization methods have been developed. As a consequence we can e ciently determine globally optimal ampli er designs, or globally optimal tradeo s among competing performance measures such aspower, openloop gain, and bandwidth. Our method therefore yields completely automated synthesis of (globally) optimal CMOS ampli ers, directly from speci cations. In this paper we apply this method to a speci c, widely used operational ampli er architecture, showing in detail how to formulate the design problem as a geometric program. We compute globally optimal tradeo curves relating performance measures such as power dissipation, unitygain bandwidth, and openloop gain. We show how the method can be used to synthesize robust designs, i.e., designs guaranteed to meet the speci cations for a
Computeraided design of analog and mixedsignal integrated circuits
 Proceedings of the IEEE
, 2000
"... This survey presents an overview of recent advances in the state of the art for computeraided design (CAD) tools for analog and mixedsignal integrated circuits (ICs). Analog blocks typically constitute only a small fraction of the components on mixedsignal ICs and emerging systemsonachip (SoC ..."
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Cited by 72 (12 self)
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This survey presents an overview of recent advances in the state of the art for computeraided design (CAD) tools for analog and mixedsignal integrated circuits (ICs). Analog blocks typically constitute only a small fraction of the components on mixedsignal ICs and emerging systemsonachip (SoC) designs. But due to the increasing levels of integration available in silicon technology and the growing requirement for digital systems to communicate with the continuousvalued external world, there is a growing need for CAD tools that increase the design productivity and improve the quality of analog integrated circuits. This paper describes the motivation and evolution of these tools and outlines progress on the various design problems involved: simulation and modeling, symbolic analysis, synthesis and optimization, layout generation, yield analysis and design centering, and test. This paper summarizes the problems for which viable solutions are emerging and those which are still unsolved. Keywords—Analog and mixedsignal computeraided design (CAD), analog and mixedsignal integrated circuits, analog circuit and layout synthesis, analog design automation, circuit simulation and modeling. I.
GPCAD: A Tool for CMOS OpAmp Synthesis
 IN PROCEEDINGS OF THE IEEE/ACM INTERNATIONAL CONFERENCE ON COMPUTER AIDED DESIGN
, 1998
"... We present a method for optimizing and automating component and transistor sizing for CMOS operational amplifiers. We observe that a wide variety of performance measures can be formulated as posynomial functions of the design variables. As a result, amplifier design problems can be formulated as a g ..."
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Cited by 42 (13 self)
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We present a method for optimizing and automating component and transistor sizing for CMOS operational amplifiers. We observe that a wide variety of performance measures can be formulated as posynomial functions of the design variables. As a result, amplifier design problems can be formulated as a geometric program, a special type of convex optimization problem for which very efficient global optimization methods have recently been developed. The synthesis method is therefore fast, and determines the globally optimal design; in particular the final solution is completely independent of the starting point (which can even be infeasible), and infeasible specifications are unambiguously detected. After briefly
An Analog Performance Estimator for Improving the Effectiveness
 of CMOS Analog System Circuit Synthesis”, Proceedings of DATE’99
, 1999
"... Critical to the automation of analog circuit systems is the estimation process of performance parameters which are used to guide the topology selection and circuit sizing processes. This paper presents a methodology to improve the effectiveness of the CMOS analog system circuit synthesis search pro ..."
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Cited by 10 (8 self)
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Critical to the automation of analog circuit systems is the estimation process of performance parameters which are used to guide the topology selection and circuit sizing processes. This paper presents a methodology to improve the effectiveness of the CMOS analog system circuit synthesis search process by developing an Analog Performance Estimator (APE) tool. APE is capable of accepting the design parameters of an analog circuit and determine its performance parameters along with anticipated sizes of all the circuit elements. The APE is structured as a hierarchical estimation engine containing performance models of analog circuits at various levels of abstraction. 1.
Synthesis tools for mixedsignal ICs: progress on frontend and backend strategies
 Proc. DAC
, 1996
"... Digital synthesis tools such as logic synthesis and semicustom layout have dramatically changed both the frontend (specification to netlist) and backend (netlist to mask) steps of the digital IC design process. In this tutorial, we look at the last decade’s worth of progress on analog circuit synth ..."
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Cited by 8 (4 self)
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Digital synthesis tools such as logic synthesis and semicustom layout have dramatically changed both the frontend (specification to netlist) and backend (netlist to mask) steps of the digital IC design process. In this tutorial, we look at the last decade’s worth of progress on analog circuit synthesis and layout tools. We focus on the frontend and backend of analog and mixedsignal IC design flows. The tutorial summarizes the problems for which viable solutions are emerging, and those which are still unsolved. 1
MIDAS  a functional simulator for mixed digital and analog sampled data systems
, 1995
"... Automatic Synthesis of CMOS Digital/Analog Converters by Robert McKinstry Robinson Neff Doctor of Philosophy in Engineering  Electrical Engineering and Computer Sciences University of California at Berkeley Professor Paul R. Gray, Chair Synthesis of analog functional blocks in integrated ci ..."
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Cited by 7 (1 self)
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Automatic Synthesis of CMOS Digital/Analog Converters by Robert McKinstry Robinson Neff Doctor of Philosophy in Engineering  Electrical Engineering and Computer Sciences University of California at Berkeley Professor Paul R. Gray, Chair Synthesis of analog functional blocks in integrated circuits offers promise for improved designer productivity. By developing module generators for commonly used analog circuit elements, a synthesis methodology may be matched to a particular application, with approaches and algorithms determined by the particular needs of target circuit type. An analog circuit designer should be able to input design specifications and underlying technology information, and a synthesis methodology should determine circuit parameter values and dimensions, creating the required mask layouts. Slow, tedious design and redesign methods should be replaced by one in which the computer finds minimum cost designs which meet performance requirements. This work implements synthesis methods for a widely used analog block, the digital/analog converter (DAC).
Automatic Synthesis of CMOS Operational Amplifiers: A Fuzzy Optimization Approach
"... In this paper, we present a method for optimizing and automating the components and transistor sizing for CMOS operational amplifiers (opamps). The optimization approaches used for the synthesis of analog circuits are found to be very much rigid in terms of capturing human intentions. In this work, ..."
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In this paper, we present a method for optimizing and automating the components and transistor sizing for CMOS operational amplifiers (opamps). The optimization approaches used for the synthesis of analog circuits are found to be very much rigid in terms of capturing human intentions. In this work, we have observed that with the use of fuzzy membership functions, human intentions for expressing wide variety of requirements, e.g., minimize power, maximize gain, etc., which are often conflicting in nature, can be captured effectively in order to formulate the objective function. For each of the performance specifications of a given topology, a membership function is assigned to measure the degree of fulfillment of the objectives and the constraints. A number of objectives are optimized simultaneously by assigning weights to each of them representing their relative importance, and then by clustering together to form the objective function that is solved by an optimization algorithm. We have considered the channel length modulation parameter (λ) for the computation of DC bias point and small signal parameters. The design results obtained from our optimization algorithm showed an excellent match with those obtained from SPICE simulation for a number of opamp topologies. 1.
1 Optimal Design of a CMOS OpAmp via Geometric Programming
"... ABSTRACT We describe a new method for determining component values and transistor dimensions for CMOS operational amplifiers (opamps). We observe that a wide variety of design objectives and constraints have a special form, i.e., theyareposynomial functions of the design variables. As a result the ..."
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ABSTRACT We describe a new method for determining component values and transistor dimensions for CMOS operational amplifiers (opamps). We observe that a wide variety of design objectives and constraints have a special form, i.e., theyareposynomial functions of the design variables. As a result the amplifier design problem can be expressed as a special form of optimization problem called geometric programming, for which very efficient global optimization methods have been developed. As a consequence we can efficiently determine globally optimal amplifier designs, or globally optimal tradeoffs among competing performance measures such as power, openloop gain, and bandwidth. Our method therefore yields completely automated synthesis of (globally) optimal CMOS amplifiers, directly from specifications. In this paper we apply this method to a specific, widely used operational amplifier architecture, showing in detail how to formulate the design problem as a geometric program. We compute globally optimal tradeoff curves relating performance measures such as power dissipation, unitygain bandwidth, and openloop gain. We show how the method can be used to synthesize robust designs, i.e., designs guaranteed to meet the specifications for a variety of process conditions and parameters. 1.1
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"... Analogue integrated circuit sizing with several optimization runs using heuristics for setting initial points Comment proportionner des circuits analogues intégrés avec plusieures marches d’optimisation à l’aide d’heuristique pour détérminer les points du départ ..."
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Analogue integrated circuit sizing with several optimization runs using heuristics for setting initial points Comment proportionner des circuits analogues intégrés avec plusieures marches d’optimisation à l’aide d’heuristique pour détérminer les points du départ
TABLE OF CONTENTS
, 2007
"... The members of the Committee appointed to examine the thesis of JACOB L. NICKOLOFF find it satisfactory and recommend that it be accepted. Chair iii ACKNOWLEDGMENTS I especially thank my wife, MerrieBeth, for her unwavering support. I thank my adviser, George La Rue, for his technical renditions, di ..."
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The members of the Committee appointed to examine the thesis of JACOB L. NICKOLOFF find it satisfactory and recommend that it be accepted. Chair iii ACKNOWLEDGMENTS I especially thank my wife, MerrieBeth, for her unwavering support. I thank my adviser, George La Rue, for his technical renditions, direction, and patience. I thank Dirk Robinson for his imperative help in applying periodic steady state analysis and the exploration of noise reduction techniques. iv