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Synthesis of highperformance analog circuits in astrx/oblx
 IEEE Trans. CAD
, 1996
"... Abstract We present a new synthesis strategy that can automate fully the path from an analog circuit topology and performance specifications to a sized circuit schematic. This strategy relies on asymptotic waveform evaluation to predict circuit performance and simulated annealing to solve a nove ..."
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Cited by 68 (4 self)
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Abstract We present a new synthesis strategy that can automate fully the path from an analog circuit topology and performance specifications to a sized circuit schematic. This strategy relies on asymptotic waveform evaluation to predict circuit performance and simulated annealing to solve a novel unconstrained optimization formulation of the circuit synthesis problem. We have implemented this strategy in a pair of tools called ASTRX and OBLX. To show the generality of our new approach, we have used this system to resynthesize essentially all the analog synthesis benchmarks published in the past decade; ASTWOBLX has resynthesized circuits in an afternoon that, for some prior approaches, had required months. To show the viability of the approach on difficult circuits, we have resynthesized a recently published (and patented), highperformance operational amplifier; ASTWOBLX achieved performance comparable to the expert manual design. And finally, to test the limits of the approach on industrialsized problems, we have synthesized the component cells of a pipelined A/D converter; ASTWOBLX successfully generated cells 23 x more complex than those published previously. I.
ASTRX/OBLX: Tools for Rapid Synthesis of High Performance Analog Circuits
 Proc. 31st ACM/IEEE DAC
, 1994
"... Abstract—We describe ASTRX/OBLX, a synthesis system that can size highperformance analog circuit topologies to meet usersupplied linear performance specifications without designersupplied equations. We present synthesis results for a large suite of circuit benchmarks and show that, when compared t ..."
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Cited by 19 (3 self)
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Abstract—We describe ASTRX/OBLX, a synthesis system that can size highperformance analog circuit topologies to meet usersupplied linear performance specifications without designersupplied equations. We present synthesis results for a large suite of circuit benchmarks and show that, when compared to prior approaches, ASTRX/OBLX can synthesize highperformance circuits with up to 3 orders of magnitude less initial design effort. I.
FASY: A fuzzylogic based tool for analog synthesis
 IEEE Transactions on ComputerAided Design of Integrated Circuits
, 1996
"... A CAD tool for analog circuit synthesis is presented. This tool, called FASY, uses fuzzy–logic based reasoning to select one topology among a fixed set of alternatives. For the selected topology, a two–phase optimizer sizes all elements to satisfy the performance constrains minimizing a cost functio ..."
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Cited by 13 (0 self)
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A CAD tool for analog circuit synthesis is presented. This tool, called FASY, uses fuzzy–logic based reasoning to select one topology among a fixed set of alternatives. For the selected topology, a two–phase optimizer sizes all elements to satisfy the performance constrains minimizing a cost function. In FASY, the decision rules used in the topology selection process are introduced by an expert designer or automatically generated by means of a learning process that uses the optimizer mentioned above. The capability of learning topology selection rules by experience, is unique in FASY. Practical examples demonstrate the tool ability of this tool to learn topology selection rules and to synthesize analog cells with different circuit topologies. 1 1
Synthesis of Manufacturable Analog Circuits
 Proceedings of ACM/IEEE ICCAD
"... Abstract † We describe a synthesis system that takes operating range constraints and inter and intra circuit parametric manufacturing variations into account while designing a sized and biased analog circuit. Previous approaches to CAD for analog circuit synthesis have concentrated on nominal anal ..."
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Cited by 11 (5 self)
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Abstract † We describe a synthesis system that takes operating range constraints and inter and intra circuit parametric manufacturing variations into account while designing a sized and biased analog circuit. Previous approaches to CAD for analog circuit synthesis have concentrated on nominal analog circuit design, and subsequent optimization of these circuits for statistical fluctuations and operating point ranges. Our approach simultaneously synthesizes and optimizes for operating and manufacturing variations by mapping the circuit design problem into an Infinite Programming problem and solving it using an annealing within annealing formulation. We present circuits designed by this integrated synthesis system, and show that they indeed meet their operating range and parametric manufacturing constraints. 1
Global Optimization Approach to Transistor Sizing for High Performance CMOS VLSI Circuits
, 1993
"... A stochastic global optimization approach is presented for skew minimization in CMOS VLSI circuits. This is a direct search strategy for the best design among feasible ones, with the designer determining when the search is stopped. Through examples, we show the power of this technique in quickly ..."
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A stochastic global optimization approach is presented for skew minimization in CMOS VLSI circuits. This is a direct search strategy for the best design among feasible ones, with the designer determining when the search is stopped. Through examples, we show the power of this technique in quickly obtaining very good designs, even for constrained problems.
II. REVIEW OF
"... AbstractÑWe describe ASTRX/OBLX, a synthesis system that can size highperformance analog circuit topologies to meet usersupplied linear performance specifications without designersupplied equations. We present synthesis results for a large suite of circuit benchmarks and show that, when compared t ..."
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AbstractÑWe describe ASTRX/OBLX, a synthesis system that can size highperformance analog circuit topologies to meet usersupplied linear performance specifications without designersupplied equations. We present synthesis results for a large suite of circuit benchmarks and show that, when compared to prior approaches, ASTRX/OBLX can synthesize highperformance circuits with up to 3 orders of magnitude less initial design effort. This paper is structured as follows. Section II reviews prior approaches to analog circuit synthesis. Section III presents the basic formulation underlying ASTRX/OBLX, while Section IV presents a circuit synthesis example to show how this formulation is applied to a real synthesis problem. In Section V we revisit some of the more interesting aspects of ASTRX/OBLX in more detail. Section VI describes results from our suite of circuit benchmarks and compares to
Abstract Synthesis of Manufacturable Analog Circuits
"... We describe a synthesis system that takes operating range constraints and inter and intra circuit parametric manufacturing variations into account while designing a sized and biased analog circuit. Previous approaches to CAD for analog circuit synthesis have concentrated on nominal analog circuit ..."
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We describe a synthesis system that takes operating range constraints and inter and intra circuit parametric manufacturing variations into account while designing a sized and biased analog circuit. Previous approaches to CAD for analog circuit synthesis have concentrated on nominal analog circuit design, and subsequent optimization of these circuits for statistical fluctuations and operating point ranges. Our approach simultaneously synthesizes and optimizes for operating and manufacturing variations by mapping the circuit design problem into an Infinite Programming problem and solving it using an annealing within annealing formulation. We present circuits designed by this integrated synthesis system, and show that they indeed meet their operating range and parametric manufacturing constraints. 1
A collection of Fuzzy Logic–Based Tools for the Automated Design, Modelling and Test of Analog Circuits
"... Analog design is quite more difficult than digital design. As a consequence, most of the effort in analog design still relies on designer’s experience. New ideas and methodogies are required to make a progress towards automating the analog design. Computational intelligence techniques, such as those ..."
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Analog design is quite more difficult than digital design. As a consequence, most of the effort in analog design still relies on designer’s experience. New ideas and methodogies are required to make a progress towards automating the analog design. Computational intelligence techniques, such as those based on fuzzy logic, have provided excellent results in those fields traditionally reserved to human experts. This paper presents a collection of fuzzy logic–based tools which find an application in the three main design phases of the analog design: topology selection, modelling and optimization, and testing. 1 I.