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Mixing digital automation with analog customization to provide a state-of-the-art mixed-signal design flow There is a category of high-end integrated circuits (ICs) – often referred to as "analog-on-top" since the top level description is a SPICE netlist – that predominantly comprise analog circuitry augmented with blocks of digital functionality. Until recently, these digital blocks were relatively small, each typically containing only a few tens, hundreds, or (sometimes) thousands of logic cells. Such blocks were often handcrafted by the analog designers using traditional custom design capture and layout technologies.
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