OPASYN: a compiler for CMOS operational amplifiers

Koh, H.; Séquin, Carlo H.; Gray, P.R.

doi:10.1109/43.46777

Cited by 315 publications

(106 citation statements)

References 18 publications

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“…The general purpose optimization codes NPSOL [3] and MINOS are used in, e.g., [4,5]. Other CAD methods based on classical optimization methods, and extensions such as a minimax formulation, include OPASYN [6], OAC [7], and STAIC [8]. These classical methods can be used with complicated circuit models, including full SPICE simulations in each iteration, as in DELIGHT.SPICE [9].…”

Section: Classical Optimization Methodsmentioning

confidence: 99%

GPCAD: a tool for CMOS op-amp synthesis

Hershenson¹,

Boyd²,

Lee³

1998 IEEE/ACM International Conference on Computer-Aided Design. Digest of Technical Papers (IEEE Cat. No.98CB36287)

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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 introducing the method, which is described in more detail in [1], we show how the method can be applied to six common op-amp architectures, and give several example designs.

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Section: Classical Optimization Methodsmentioning

confidence: 99%

GPCAD: a tool for CMOS op-amp synthesis

Hershenson¹,

Boyd²,

Lee³

1998 IEEE/ACM International Conference on Computer-Aided Design. Digest of Technical Papers (IEEE Cat. No.98CB36287)

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“…As an illustration I will discuss OPASYN [8], a program that produces custom-made IC (integrated circuit) layouts of an operational amplifier (op-amp) tailored to a particular application. A typical op-amp may have anywhere from a 20 to more than a hundred discrete circuit elements (transistors, resistors, capacitors…”

Section: Automated Layout Of Operational Amplifiersmentioning

confidence: 99%

Interactive Procedural Computer-Aided Design

Séquin

Ninth International Conference on Computer Aided Design and Computer Graphics (CAD-CG'05)

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“…This formulation offers fast performance evaluation which is conducive to aggressive search over the entire candidate solution space. A number of optimization strategies have been attempted with equation-based techniques, including numerical search [10][2], combinatorial search [14], hierarchical systems that attempt to decompose the evaluation and optimization [5], qualitative and fuzzy reasoning techniques [25], and geometric programming [6]. However, creating a model that captures the behavior of a circuit topology as a set of compact, closed form, analytical equations for performance evaluation is prohibitively time consuming, indeed, often more time consuming than manually designing the circuit.…”

Section: Review Of Prior Approachesmentioning

confidence: 99%