Operating-point driven formulation for analog computer-aided design

Guerra-Gomez, I.; McConaghy, Trent; Tlelo‐Cuautle, Esteban

doi:10.1007/s10470-012-9998-1

Cited by 20 publications

(3 citation statements)

References 41 publications

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“…In this case the optimization variables are related to the bias regions of the circuit. According to [48], OPDbased strategies significantly reduce the optimization algorithms number of iterations. In this type of approach the variables are the voltages and currents of the transistors.…”

Section: E Variablesmentioning

confidence: 99%

A Comprehensive Review on Automation-based Sizing Techniques for Analog IC Design

Girardi

De-Oliveira

Ghissoni

et al. 2022

JICS

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Analog integrated circuits are present in most electronic systems. They must be designed carefully in order to achieve the required performance specifications. Although almost half of the design effort in a chip is spent in analog modules, there are not yet a consolidated industry of analog design automation tools capable to fully synthesize analog circuits in a fast and generic way. This is due the fact that automatic or semi-automatic design tools have to deal with high design complexity, which includes several specifications and design variables. A lot of research effort have been done in this field in the past years, proposing methods for automating parts of the design flow, from topology selection to devices sizing and layout generation. This paper presents a review of the state-of-the art in analog design automation methods, focusing on techniques and algorithms used to size robust circuits while efficiently exploring the design space.

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Section: E Variablesmentioning

confidence: 99%

A Comprehensive Review on Automation-based Sizing Techniques for Analog IC Design

Girardi

De-Oliveira

Ghissoni

et al. 2022

JICS

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“…Recently, analysis based on piecewise-linear modeling has emerged and gained popularity in circuit simulation and other related areas (Vazquez-Leal 2013 ; Guerra-Gómez et al. 2013 ; Junaid and Wang 2006 ; D’Arco and Suul 2014 ; Li et al. 1997 ; Lin and Wang 2009 ).…”

Section: Introductionmentioning

confidence: 99%

Speed-up hyperspheres homotopic path tracking algorithm for PWL circuits simulations

et al. 2016

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In the present work, we introduce an improved version of the hyperspheres path tracking method adapted for piecewise linear (PWL) circuits. This enhanced version takes advantage of the PWL characteristics from the homotopic curve, achieving faster path tracking and improving the performance of the homotopy continuation method (HCM). Faster computing time allows the study of complex circuits with higher complexity; the proposed method also decrease, significantly, the probability of having a diverging problem when using the Newton–Raphson method because it is applied just twice per linear region on the homotopic path. Equilibrium equations of the studied circuits are obtained applying the modified nodal analysis; this method allows to propose an algorithm for nonlinear circuit analysis. Besides, a starting point criteria is proposed to obtain better performance of the HCM and a technique for avoiding the reversion phenomenon is also proposed. To prove the efficiency of the path tracking method, several cases study with bipolar (BJT) and CMOS transistors are provided. Simulation results show that the proposed approach can be up to twelve times faster than the original path tracking method and also helps to avoid several reversion cases that appears when original hyperspheres path tracking scheme was employed.

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“…In recent years, the PWL modelling technique gained popularity as a tool for circuit simulation and other related areas [ 39 , 40 ]. The basic idea is to replace traditional models by their piecewise linear (PWL) representations [ 41 – 44 ].…”

Section: Introductionmentioning

confidence: 99%

Modified Hyperspheres Algorithm to Trace Homotopy Curves of Nonlinear Circuits Composed by Piecewise Linear Modelled Devices

Vázquez-Leal

Jimenez-Fernandez

Benhammouda

et al. 2014

The Scientific World Journal

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We present a homotopy continuation method (HCM) for finding multiple operating points of nonlinear circuits composed of devices modelled by using piecewise linear (PWL) representations. We propose an adaptation of the modified spheres path tracking algorithm to trace the homotopy trajectories of PWL circuits. In order to assess the benefits of this proposal, four nonlinear circuits composed of piecewise linear modelled devices are analysed to determine their multiple operating points. The results show that HCM can find multiple solutions within a single homotopy trajectory. Furthermore, we take advantage of the fact that homotopy trajectories are PWL curves meant to replace the multidimensional interpolation and fine tuning stages of the path tracking algorithm with a simple and highly accurate procedure based on the parametric straight line equation.

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Operating-point driven formulation for analog computer-aided design

Cited by 20 publications

References 41 publications

A Comprehensive Review on Automation-based Sizing Techniques for Analog IC Design

A Comprehensive Review on Automation-based Sizing Techniques for Analog IC Design

Speed-up hyperspheres homotopic path tracking algorithm for PWL circuits simulations

Modified Hyperspheres Algorithm to Trace Homotopy Curves of Nonlinear Circuits Composed by Piecewise Linear Modelled Devices

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