By Geert Van der Plas
In the 1st half the AMGIE analog synthesis process is defined. AMGIE is the 1st analog synthesis approach that automates the entire layout technique from requirements right down to demonstrated format. it really is specified to the layout of moderate-complexity circuits. It is dependent 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 strategies paintings. Experimental effects got with the AMGIE method are said, 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 ebook. This technique is supported through instruments to spice up the productiveness of the clothier. An instance of the sort of software is Mondriaan, that's precise in the direction of the automated structure new release of hugely ordinary 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 techniques bring up analog layout productiveness. layout occasions of the various layout experiments undertaken are said in the course of the publication to illustrate this.
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Additional info for A Computer-Aided Design and Synthesis Environment for Analog Integrated Circuits
The performance value is constrained in an interval, possibly the upper or lower bound is The interval can be open or closed (inequality constraint), or be a single value (equality constraint). The majority of the performance specifications belong to this category. An example of a performance value is for instance the gainbandwidth, that should be higher than or equal to 10MHz. 2. the performance value is constrained in an interval at a certain parameter value. 1%. Both the settling time value and the settling accuracy are to be specified.
9. In this graph the direction and order in which the equations have to be solved is indicated. In this way the values of the remaining 12 dependent variables (single line ovals) can be calculated out of the values of the independent variables (double line ovals). This information is then written out in C code as a procedural computational plan and subsequently compiled and stored in the sizing model library, allowing fast evaluation of the sizing model in an optimization loop. During optimization the optimization algorithm will then vary the independent variables to find the optimum design solution that satisfies all (specification) constraints.
Note however that the designer at any time can redo a previous step or — at his own responsibility — change the design after any step before proceeding. Part of the design flow is also the handling of redesign in the case of design failures. In the present AMGIE version, the Design Controller (DC) does not yet automatically impose the corrective action to be taken in case of redesign. As this largely depends on the actual design data, it would require sophisticated design expertise to be built in the design controller.
A Computer-Aided Design and Synthesis Environment for Analog Integrated Circuits by Geert Van der Plas