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RAVEN: Automatic Generation of Analog Behavioral Models

RAVEN: Automatic Generation of Analog Behavioral Models . Chandramouli Kashyap Chirayu Amin Reshma Kamat Design Technology Solutions, Intel Corp. Why is this an important problem. IO bandwidth increasing + tighter specs => increased analog complexity

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RAVEN: Automatic Generation of Analog Behavioral Models

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  1. RAVEN: Automatic Generation of Analog Behavioral Models Chandramouli Kashyap Chirayu Amin Reshma Kamat Design Technology Solutions, Intel Corp.

  2. Why is this an important problem • IO bandwidth increasing + tighter specs => increased analog complexity • More variety of analog circuits: IO, sensor, fuse, PLLs • Analog circuits adaptively controlled by digital analog digital Ensure correct digital/analog interactions

  3. Problem with analog abstraction FEV digital Mixed-signal simulator analog Verilog- AMS • accurate but slow • need access to process models Verilog- reals • Manual; quality varies greatly • Fast but less accurate

  4. What is Raven Spec/Config files RAVEN analog schematic Verilog-AMS SV with Reals

  5. How Raven works Generate Spiceruns Based on user spec Analyze waveforms Extractparameters Build look-uptable Encode inVerilog

  6. Input specs • Type of input • Digital vs analog, voltage vs current • Type of excitation • Periodic, step, ramp • Range of inputs • Min:step:max • Range could be different for different modes

  7. Types of output handled • Periodic • Extract period, pw, amplitude, phase offset wrt ref • Transition • Extract delay, final value • Average • Extract average over an interval T

  8. Circuits successfully modeled

  9. What is Raven not good at • Complex history dependent effects • Any state nodes in the circuit need to be marked by user with their ranges

  10. Summary and future work • Raven can generate RTL abstractions of analog circuits • Allows designer to focus on design and specs • Can track netlist ECOs • Raven models can be made PVT aware easily • Can these models be used for FV using hybrid system techniques?

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