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A NOVEL METHODOLOGY FOR MODELING PERFORMANCE PARAMETERS OF ANALOG CIRCUITS

BALASUBRAMANIAN, SHYAM SUNDAR

Abstract Details

2004, MS, University of Cincinnati, Engineering : Computer Engineering.
The need to explore large design spaces and the large computational overhead in full circuit simulations has been the driving factor for the use of performance estimation techniques in automated synthesis of analog and mixed-signal circuits. One such technique called Macromodeling has been used extensively nowadays owing to their accuracy (comparable to the simulators) and speed. The smaller evaluation time and comparable accuracy of these models to the simulators like HSPICE have made them quite popular for use in synthesis algorithms (which optimize a cost function based on performance constraints). Traditional Macromodeling approaches involve the generation and use of a separate macromodel for each performance parameter and consequently, does not support the dynamic addition of performance parameters. The addition of a new performance constraint necessitates charactarization data regeneration and model development phase and consequently, a large time overhead. In this thesis, we present a new approach wherein we develop a model for producing the entire AC response curve rather than separate models for each performance parameter. The model consists of a set of regressors (which have been implemented using polynomials followed by regression on the polynomial coefficients using neural networks) which take in the design variables as input and produce the AC response as output very quickly. Thus, the addition of a performance parameter requires the evaluation of that parameter from the calculated response and thus, eliminates the data re-generation and model development time overhead. In essence, the proposed approach supports and requires very minimal overhead for the dynamic addition of performance parameters. The performance parameters, calculated from the evaluated response, are then used for the cost function optimization in the synthesis loop.
Dr. Ranga Vemuri (Advisor)
101 p.

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Citations

  • BALASUBRAMANIAN, S. S. (2004). A NOVEL METHODOLOGY FOR MODELING PERFORMANCE PARAMETERS OF ANALOG CIRCUITS [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100763758

    APA Style (7th edition)

  • BALASUBRAMANIAN, SHYAM SUNDAR. A NOVEL METHODOLOGY FOR MODELING PERFORMANCE PARAMETERS OF ANALOG CIRCUITS. 2004. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100763758.

    MLA Style (8th edition)

  • BALASUBRAMANIAN, SHYAM SUNDAR. "A NOVEL METHODOLOGY FOR MODELING PERFORMANCE PARAMETERS OF ANALOG CIRCUITS." Master's thesis, University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100763758

    Chicago Manual of Style (17th edition)