Analog design quality closure: What’s missing from current flows?

Stephane Bonniol, Satin Technologies SAS
EETimes (12/6/2010 10:30 PM EST)

Introduction

The design of AMS circuits requires the adoption of specific recipes, the sharing of past experiences, and a huge number of design explorations with different constraints and parameters. The quality of results and the time to closure in analog designs largely depend on the know-how and experience of the engineers. Analog designers use dedicated implementation and verification tools during the different steps of the design flow and take decisions for the next steps based on the analysis of the results, driven by their skills and experience.

As the number of design iterations increases, so does the volume and complexity of iterations, artifacts and reports generated by the tools, which in turn increases the time for analysis and the risk of errors.

Although analog design best practices have traditionally been viewed as not being as sharable as digital design -- as being more manual, creative, ad hoc -- more and more of the repetitive and manual, tedious tasks are being automated to enable designers to focus on key areas. The increase in size, complexity, and automation of the AMS design process makes it even more important to leverage the gained experience on a given design and to convey the best practices from project to project, to continuously build a know-how data repository that can be shared and reused efficiently across an organization. In addition, some specific metrics also can be used to qualify third-party analog intellectual property (IP) and to help formalize the communication of expectations between providers and integrators to ensure that quality assessment is fact-based.

Ad hoc quality monitoring and manual checklist assessment usually are considered as brakes to methodology and best practices adoption because of the risk of subjective and/or wrong statements as well as intrusion and delay in engineering tasks. This paper presents the implementation of an objective, automated and flexible quality assessment process. Examples are used to describe process implementation and results. The paper describes how the best practices and quality metrics identified and used by analog specialists can be turned into formalized rules, how these rules can be automatically assessed from the analog design flow state and how the assessment results can be continuously shared between the different stakeholders. The approach enables the creation of a holistic quality monitoring cockpit on top of the analog design ecosystem, easily configurable and adaptable, with no intrusion into the design flow and no addition to engineering overhead.

Examples used illustrate how a methodology for analog design quality closure can be implemented within existing methodologies as well as to help design teams define their own best-practice quality monitoring process. The presented framework can be used to deploy any type of quality metrics defined by the analog experts.

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