By Geert Van der Plas
In the 1st half the AMGIE analog synthesis process is defined. AMGIE is the 1st analog synthesis method that automates the whole layout approach from requirements all the way down to tested format. it truly is certain to the layout of moderate-complexity circuits. It is dependent upon layout and circuit wisdom saved within the tool's libraries and will be utilized by either beginner and skilled analog designers in addition to system-level designers. the internal workings are defined intimately, with (practical) examples to illustrate how the carried out algorithms and strategies paintings. Experimental effects bought with the AMGIE method are stated, together with real fabricated and measured circuits.
The moment technique, i.e. the systematic layout of high-performance analog circuits, is mentioned within the moment a part of the booklet. This method is supported through instruments to spice up the productiveness of the clothier. An instance of this kind of software is Mondriaan, that's exact in the direction of the automated format new release 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 whole layout direction is mentioned intimately.
Both complementary techniques elevate analog layout productiveness. layout instances of the various layout experiments undertaken are stated in the course of the e-book to illustrate this.
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It indicates through a traffic light coloring scheme (red — green) which design steps have already been executed successfully, and the next step can only be executed when the previous step has been terminated successfully. 4. a message window for warnings and messages at the very bottom and reporting the progress of the synthesis run. 4 Output of the AMGIE System After running through the above design flow, the AMGIE system will return the following output to the user: the layout of the circuit the sized schematic (from which a netlist can be generated) the datasheet, which contains the simulated performance values obtained by the final design the design history, which is a file that contains the trace of the complete design session, for inspection purposes a design document that contains the specification values, intermediate results and a complete, detailed description of the final result an automatically created standard cell of the design, that can be reused in the system during later design runs.
5. Other examples are the schematic editor, layout editor, netlist editor, datasheet editor, design history browser, etc. For further snapshots of these editors/viewers, the reader is referred to the AMGIE user manual [VdPlas 96a]. The modular implementation approach that has been chosen, makes it possible to replace 38 The AMGIE Analog Synthesis System existing point tools with compatible, alternative implementations (which could even be manual). The strength of the AMGIE synthesis system is that for all design steps automated solutions have been implemented.
1(a). 1(b). It uses estimates internally to account for the technology variations or uses a direct yield method [Debyser 98a, Debyser 98b] to include the (manufacturing) tolerances. After verification, the nominal performance and specification variability (a normal distribution is assumed) is extracted. 1(c). The available layout margins can now exactly be calculated: These can all be consumed by the layout tool to provide an acceptable design. 1(d). 1(d). 1 Specifications and Hierarchy The estimated margins 41 are calculated as follows: where (expressed as a percentage) and have default values (that can be zero) dependent on the specification at hand.