By Geert Van der Plas
In the 1st half the AMGIE analog synthesis process is defined. AMGIE is the 1st analog synthesis process that automates the complete layout technique from requirements right down to confirmed format. it really is special to the layout of moderate-complexity circuits. It depends upon layout and circuit wisdom kept within the tool's libraries and will be utilized by either amateur and skilled analog designers in addition to system-level designers. the internal workings are defined intimately, with (practical) examples to illustrate how the applied algorithms and methods paintings. Experimental effects acquired with the AMGIE process are pronounced, together with real fabricated and measured circuits.
The moment process, i.e. the systematic layout of high-performance analog circuits, is mentioned within the moment a part of the publication. This method is supported by way of instruments to spice up the productiveness of the clothier. An instance of this type of software is Mondriaan, that's special in the direction of the automated format iteration of hugely typical analog blocks. The proposed systematic layout method is then utilized to the layout of high-accuracy current-steering electronic to analog converters (DACs). the complete layout direction is mentioned intimately.
Both complementary ways bring up analog layout productiveness. layout instances of the several layout experiments undertaken are pronounced through the publication to illustrate this.
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Additional info for A Computer-Aided Design and Synthesis Environment for Analog Integrated Circuits
Hence their design could be entirely automated while guaranteeing a fully customized solution for every set of specifications and for every selected CMOS process. In this way also technology porting of a highly reusable cell library can be automated. On the other hand, some of the individual tools of the AMGIE system can also be used as point tools to leverage the design of the so-called “once-in-a-lifetime” circuits, as for instance is the case in domains like telecom and RF where the topologies tend to change with every new design.
AMGIE stores data in a run-time database for the cell that is under design (CUD Database). Two libraries, the technology library and the cell library, store the design knowledge that is used by the design tools. The complete system has been integrated in a commercial EDA framework. 4 The AMGIE Synthesis System 35 database. The integration within a commercial framework also offered the advantage that existing commercial tools could be used for simulation, extraction, layout viewing, schematic capture and framework services.
1: the time required to formalize and encode the design plan for every circuit is larger than with any other method. The overall obtained accuracy is rather poor: typically level 1 SPICE models are used to model the devices, the equations modeling the performance specifications have been simplified, and technology information has to be hardcoded in the plans. The time needed to derive and craft a plan is long and the flexibility in changing the plan to a new specification target set is low. Therefore later approaches adopted an optimization-based approach where the design problem was recast as a constrained optimization problem, which offers maximum flexibility and reduces the preparation time at the cost of larger on-line run times.