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HSPICE gets Faster, better Convergence

HSPICE gets Faster, better Convergence
by Daniel Payne on 06-13-2011 at 5:53 pm

Hany El Hak – Product Marketing Manager

Frederik Iverson – AE

Scott Wetch – HSPICE Architect

HSPICE – 5 years ago convergence was not so good, while 95% of analog circuits today converge out of the box, no options are required.

Synopsys AMS Portfolio – wide range of tools
– Custom Designer: IC schematic and layout tools
– HSPICE – circuit simulation
– CustomSim – full chip circuit simulation
– IC Validator/Star RC – extraction, DRC, LVS

HSPICE – Golden SPICE standard for about 30 years now, the same tool the foundry used to create their cells
– Used in IC, AMS, PCB for SI

Issues – Long run times, could be days to cover all of the corners required, more runs

Improvements in HSPICE – 5X faster than 2007 on a single core, averaged over 100’s of circuits
– Precision Parallel, 7X faster when using 8 cores compared to a single core
– 10X more capacity, about 10 million elements
– New Analysis added: High Frequency, Statistical Eye Diagrams, Transient Noise, Loop Stability
– Convergence, 95% out of the box, no settings required
– Distributed Processing (MC, Corners, Sweeps) – distribute over the network (17X on 20 CPUs)

HSPICE Precision Parallel – run times reduced from days to hours
– Up to 7X faster on 8 cores (use –hpp option)
– PLL runs now reduced to 4 hours instead of days
– PLL example with 7K MOS and RC, 12.5 hours (148 hours, competitor)
– Clock Tree with 10M elements, 7 hours (108 hours, competitor)
– Sigma Delta Converter, 7.7 hours (16 hours, competitor)

HSPICE Distributed Processing – divide and conquer (MC, corners with .ALTER, sweeps)
– 10 CPUs at 8.7X faster
– 20 CPUs at 17.3X faster (some overhead to collect all that data)

Post-layout – selective net back-annotation (use parasitic only where needed)
– Check and find only the active nets for extraction (automatic or manually identified)
– Apply parasitics only to critical nets that are identified

Transient Noise Analysis – Include noise in time domain simulations (about 2X to 3X slower than transient)
– Full nonlinear analysis of noise effects in the time domain
– All devices are taken into account (thermal noise, channel noise, flicker noise)
– Today a single CPU, in September see the parallel version

Custom Designer (Schematics and Layout)
– HSPICE integrated within

Frederick Iverson, demo of Duty Cycle Corrector (40nm node, Used in IP group for USB 3.0, 450 analog designers at SNPS)
– Custom Designer uses OA for a db. Any circuit simulator can be added to Custom Designer.
– Normal simulation is 5 minutes to complete, Precision Parallel completes in about 1 minute
– Command line has Tcl, so it’s easy to save and re-run commands.
– Si2 is showing how to run tools with many languages: Tcl, Perl, Ruby, etc.
– Plot of simulation results shown in WaveView tool, measurement tool to show % duty cycle.
– HSPICE uses one license for two threads, so use it at no extra cost
– Back annotate a full netlist or a partial netlist (used a DSPF file from Star RC)
– Names in HSPICE are the pre-layout names even with back-annotated values
– Transient noise demonstrated, the output does show jitter, wave view shows jitter versus time, histogram shows standard deviation on jitter values

Summary
HSPICE has to continually improve in order to stay current with Berkeley DA, Eldo, Spectre and FineSIM circuit simulators.

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