Optimal Design of a CMOS Op-Amp via Geometric Programming

Optimal Design of a CMOS Op-Amp via Geometric Programming (2001)

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by Maria del Mar Hershenson , Stephen P. Boyd , Thomas H. Lee

Venue:	IEEE Transactions on Computer-Aided Design
Citations:	36 - 8 self

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Datum	Value	Source
TITLE	Optimal Design of a CMOS Op-Amp via Geometric Programming	SVM HeaderParse 0.1
AUTHOR NAME	Maria Del Mar Hershenson	SVM HeaderParse 0.1
AUTHOR NAME	Stephen P. Boyd	SVM HeaderParse 0.1
AUTHOR NAME	Thomas H. Lee	SVM HeaderParse 0.1
ABSTRACT	Abstract—We describe a new method for determining component values and transistor dimensions for CMOS operational amplifiers (op-amps). 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 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, open-loop gain, and bandwidth. Our method, therefore, yields completely automated sizing 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, unity-gain bandwidth, and open-loop gain. We show how the method can be used to size robust designs, i.e., designs guaranteed to meet the specifications for a variety of process conditions and parameters. Index Terms—Circuit optimization, CMOS analog integrated circuits, design automation, geometric programming, mixed analog–digital integrated circuits, operational amplifiers. I.	SVM HeaderParse 0.1
CITATIONS	106 found	ParsCit 1.0