Abstraction models and use models in mixed-signal verification Hi folks! I am back! If you recall, in my previous post (Part 1), I outlined the key drivers behind the increasing need for mixed-signal verification today. In this post, I want to elaborate on the challenges and tradeoffs inherent in the different design abstraction models and verification use models that are prevalent today. First, what are design abstraction models and how do they differ? The answer lies in the level of design abstraction (cell-level, macro-level, block-level, full-chip or SoC-level), the type of design (analog, mixed-signal), how you choose to verify your design and what your verification objectives are. Abstraction models and verification use models usually go hand-in-hand. Traditionally, custom designs at the cell-level, macro-level, and block-level, are verified using what is known as the “Analog Top” or “SPICE Top” model. This model entails a bottom-up SPICE-centric verification approach wherein, the design is verified in SPICE netlist format using a SPICE testbench and a SPICE simulator (e.g., HSPICE). While this model ensures high verification accuracy, it is not scalable i.e., it cannot be extended to very large designs or full-chip verification, due to the performance/capacity limitations of SPICE simulators. But there are exceptions – discrete analog designs typically are verified using this model even at the full-chip level, but by using a FastSPICE simulator (e.g., CustomSim), and by incorporating limited behavioral modeling using System Verilog, Verilog, or Verilog-A, to alleviate the capacity constraints of the simulator. The figure below depicts such a scenario:
The increasing need for mixed-signal verification!
DAC 2015 Synopsys Circuit Simulation Luncheon: Altera, ST, TSMC and Xilinx on Synopsys Industry Leading Performance for Analog Mixed-signal Designs
Improving the performance of existing technologies has always been a key element in the development of computational systems and EDA tools. However, as analog mixed-signal designs complexity drastically increases, conventional techniques are becoming outdated and new technologies must be adopted by designers.
AMS HSPICE SIG dinner during DesignCon 2015: Best-in-class techniques and solutions for Power and Signal Integrity analysis
Synopsys AMS SIG Event in Bangalore, India – ADI, ARM, ST and Xilinx present their latest solutions to resolve today analog mixed-signal challlenges
Happy new year everyone,
VCS AMS joint webinar with Synopsys, ST and ARM : latest insights on advanced mixed-signal verification