By Nuno Lourenço, Ricardo Martins, Nuno Horta
This booklet introduces readers to various instruments for automated analog built-in circuit (IC) sizing and optimization. The authors supply a historic standpoint at the early tools proposed to take on computerized analog circuit sizing, with emphasis at the methodologies to dimension and optimize the circuit, and at the methodologies to estimate the circuit’s functionality. The dialogue additionally comprises powerful circuit layout and optimization and the latest advances in layout-aware analog sizing techniques. The authors describe a technique for an automated circulation for analog IC layout, together with info of the inputs and interfaces, multi-objective optimization thoughts, and the improvements made within the base implementation by utilizing laptop leaning innovations. The Gradient version is mentioned intimately, besides the how to contain format results within the circuit sizing. The options and algorithms of the entire modules are completely defined, permitting readers to breed the methodologies, enhance the standard in their designs, or use them as place to begin for a brand new software. an intensive set of software examples is integrated to illustrate the services and lines of the methodologies described.
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Additional info for Automatic Analog IC Sizing and Optimization Constrained with PVT Corners and Layout Effects
2. 3. 4. f. f. , typical values for temperature and voltage and no process variation, most of the circuits’ performance ﬁgures can be accurately linearized. It takes a deterministic circuit optimization approach, where the worst case environment and process parameters are iteratively updated using a gradient estimation. Then, at each iteration, the design variables are determined solving the sizing optimization problem considering the latest worst case environment and process parameter set. To increase the accuracy of the estimates, in  a quadratic model replaces the linear model.
In  the layout is also produced by a parameterized generator, where layout parasitics and devices sizes are passed to the precompiled symbolic performance model that estimates the circuit performance for each sizing solution, attempting to avoid circuit simulation. In  the parasitic effects are modeled in the circuit equations, a 24 2 Previous Works on Automatic Analog IC Sizing DESIGN SPECS OPTIMIZATION KERNEL Design Parameters LAYOUT GENERATOR /PARASITIC MODEL Extracted Circuit CIRCUIT SIMULATOR Circuit Performances SIZED CIRCUIT Fig.
SPICE  OASYS  BLADES  OPASYN  CAMP  OPTIMAN  SEAS  DONALD  Chang  STAIC  MINLP  Maulik et al. 3 Summary of circuit sizing tools Qualitative reasoning + post optimization Design plan (includes backtracking features) Expert system for analog design Steepest descent Expert system, flexible architecture SA SA Equation solver (Newton Raphson variant) Top-Down constraint driven 2 step optimization Branch and bound Sequential quadratic programming SA GA Design plan plus SA post-optimization Feasible directions optimization Design plan/optim.
Automatic Analog IC Sizing and Optimization Constrained with PVT Corners and Layout Effects by Nuno Lourenço, Ricardo Martins, Nuno Horta