By Geert Van der Plas
In the 1st half the AMGIE analog synthesis approach is defined. AMGIE is the 1st analog synthesis process that automates the complete layout strategy from requisites right down to tested structure. it truly is particular to the layout of moderate-complexity circuits. It depends upon layout and circuit wisdom saved 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 bought with the AMGIE method are pronounced, together with real fabricated and measured circuits.
The moment method, i.e. the systematic layout of high-performance analog circuits, is mentioned within the moment a part of the ebook. This method is supported by means of instruments to spice up the productiveness of the clothier. An instance of one of these instrument is Mondriaan, that's unique in the direction of the automated format iteration of hugely normal analog blocks. The proposed systematic layout method is then utilized to the layout of high-accuracy current-steering electronic to analog converters (DACs). the total layout direction is mentioned intimately.
Both complementary techniques bring up analog layout productiveness. layout occasions of the various layout experiments undertaken are suggested in the course of the publication to illustrate this.
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Extra info for A Computer-Aided Design and Synthesis Environment for Analog Integrated Circuits
For example, the total area occupied by a simple MOS transistor (GCM=1) is given by: where the core MOS area and the routing space are estimated as: where MINIMAL_AREA, ROUTING_SPACE, DIFFUSION_WIDTH, GATE_STRAP, etc. are technology dependent constants. 6. Also other device geometry parameters like ps, pd, nrs, nrd are derived in this way. These are essential to estimate during circuit sizing parasitics of the devices like the bulk capacitances, extrinsic drain/source resistances, etc. 4. The technology info model parameters: these define extra technology-specific infor- mation used to characterize the devices.
The design management features of the design controller and the overall interfaces were described, making it possible to provide a completely integrated solution to the analog synthesis problem. The actual design tasks have already been defined but no implementation was supplied. In this chapter the core steps in the analog design flow and the technical and algorithmic details of the corresponding design tools will be described. But first two remarks are formulated: (1) on the hierarchy model of the AMGIE analog synthesis system and the relation to its point tools and (2) on the performance-driven approach (represented by the functionblock’s specifications) as seen by the point tools.
Hence, there are 4 54 Detailed Description of the AMGIE Analog Synthesis System degrees of freedom in this (simplified) example. (In reality there are more equations capturing also the AC and transient behavior of the circuit). However, only equality constraints eliminate degrees of freedom; inequality constraints don’t. This means that 4 independent variables can be selected as input variables. 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).