Qualitative reasoning about physical systems: a return to roots
Artificial Intelligence - Special issue: Qualitative reasoning about physical systems II
The art of Prolog (2nd ed.): advanced programming techniques
The art of Prolog (2nd ed.): advanced programming techniques
Approximate symbolic analysis of large analog integrated circuits
ICCAD '94 Proceedings of the 1994 IEEE/ACM international conference on Computer-aided design
ASTRX/OBLX: tools for rapid synthesis of high-performance analog circuits
DAC '94 Proceedings of the 31st annual Design Automation Conference
Asymptotic Waveform Evaluation and Moment Matching for Interconnect Analysis
Asymptotic Waveform Evaluation and Moment Matching for Interconnect Analysis
Computer Methods for Circuit Analysis and Design
Computer Methods for Circuit Analysis and Design
DONALD: a workbench for interactive design space exploration and sizing of analog circuits
EURO-DAC '91 Proceedings of the conference on European design automation
Proceedings of the 1998 IEEE/ACM international conference on Computer-aided design
Efficient analog circuit synthesis with simultaneous yield and robustness optimization
Proceedings of the 1998 IEEE/ACM international conference on Computer-aided design
A VHDL-AMS compiler and architecture generator for behavioral synthesis of analog systems
DATE '99 Proceedings of the conference on Design, automation and test in Europe
MAELSTROM: efficient simulation-based synthesis for custom analog cells
Proceedings of the 36th annual ACM/IEEE Design Automation Conference
DATE '00 Proceedings of the conference on Design, automation and test in Europe
A two-layer library-based approach to synthesis of analog systems from VHDL-AMS specifications
ACM Transactions on Design Automation of Electronic Systems (TODAES)
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This paper describes a new modeling methodology that allows to derive systematically behavioral signal path models of operational amplifiers. Combined with symbolic simulation, these models provide high qualitative insight in the small-signal functioning of a circuit. The behavioral signal path model provides compact interpretable expressions for the poles and zeros that constitute the signal path. These expressions show which design parameters have dominant influence on the position of a pole/zero and thus enable a designer to control a manual interactive sizing process. The methodology consists of the application of a sequence of abstractions, so that one gradually progresses from a full device to a full behavior circuit representation. During this translation, qualitative insight and design requirements are obtained. The methodology is implemented in an open tool called \EFtoef. The behavioral signal path model is also used for optimization based sizing in order to achieve pole placement in an efficient way. For optimization based sizing, a new strategy for hierarchical penalty function composition is proposed, which allows sequential pruning of the design space. Combined with an operating point driven \DC formulation and local minimax optimization, a fast sizing method is obtained which can be used for interactive design space exploration. Experimental results of both modeling and sizing are shown.