Authors: Jinsik Yun, Jeannette Djigbenou, Dr. Dong S. Ha
HSPICE is one of the strongest SPICE simulator. It is famous for its accuracy and it's a de-facto standard upon which most semiconductor companies depend.
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NOTE: If you are using Windows OS, you have to setup X-window system.
You are encouraged to setup X-window by installing CygwinX and PuTTY programs.
Here is the link where you can download CygwinX and PuTTY and find the installation guide: VT CVL supported software
You are encouraged to setup X-window by installing CygwinX and PuTTY programs.
Here is the link where you can download CygwinX and PuTTY and find the installation guide: VT CVL supported software
This tutorial shows hspice simulation of a CMOS inverter. A good tutorial on spice simulation is available here.
- Before you run your SPICE simulations in a new xterm or rxvt window, run the following UNIX command in your UNIX directory:
- And the UNIX cursor should change, for instance if your username is myname and your working directory is myworkdir, and you are using the machine fox, The cursor should change from:
to:
NOTE: For the rest of this document, the instructions will be based on the simulations for the TSMC 0.18um process. However, some alternate files for TSMC 0.25 um, 0.35um and HP 0.5um process will also be indicated.
1. Ez100pu smart card reader. Copy the following inverter netlist file and MOSFET model file into your working directory.
IBM 90 nm Coming Soon! | IBM 0.13 um inv_tr_013.sp for transient analysis. inv_fr_013.sp for frequency analysis. inv_dc_013.sp for DC analysis. ibm_0.13um_model for 0.13um process model. |
TSMC 0.18 um inv_tr_018.sp for transient analysis. inv_fr_018.sp for frequency analysis. inv_dc_018.sp for DC analysis. tsmc_018um_model for 0.18um process model. | TSMC 0.25 um inv_tr_025.sp for transient analysis. inv_fr_025.sp for frequency analysis. inv_dc_025.sp for DC analysis. tsmc_0.25um_model for 0.25um process model. |
TSMC 0.35 um inv_tr_035.sp for transient analysis. inv_fr_035.sp for frequency analysis. inv_dc_035.sp for DC analysis. tsmc_035um_model for 0.35 um process model. | HP 0.5 um inv_tr_050.sp for transient analysis. inv_fr_050.sp for frequency analysis. inv_dc_050.sp for DC analysis. hp05um_model for 0.5 um process model. |
22nm Predictive Technology Model from ASU: inv_tr_22.sp for transienct analysis. inv_fr_22.sp for frequency analysis. inv_dc_22.sp for DC analysis. PTM_22nm_Metal_Gate_model for 22 nm process model. | Other spice models can be found on the MOSIS web page and the PTM website. |
Note that the SPICE (.sp) toplevel file must contain a line, usually near the end, saying:
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.option post
This case-insensitive line may specify other options in addition, such as:
.option POST NOMOD accurate
but the option POST must be specified!
CMOS Inverter Circuit
2. To perform hspice simulation on the transient analysis file, type the command:
hspice inv_tr_018.sp > inv_tr_018.lis
Four files (inv_tr_018.lis, inv_tr_018.ic0, inv_tr_018.st0, inv_tr_018.tr0) are created. View inv_tr_018.lis, inv_tr_018.ic0 and inv_tr_018.st0 to examine simulation results and status.
3. To plot the results, type the command:
CScope
- CScope (CosmosScope) window appears. Select File->Open->Plotfiles
The Open Plotfiles window is defaulted to display PL/AWD files. Set the Files of Type option to display HSPICE (*.tr*,*.ac*,*.sw*,*.ft*) files. File inv_tr_018.tr0 is then listed. Select inv_tr_018.tr0 and click open. - “Signal Manager” window appears. Click the inv_tr_018.tr0 item. Another window entitled “inv_tr_018.tr0” contains the node names and measured values to be plotted. Double click 'in' and 'out' signals. Waveforms show up in CScope window
- To update Axis information, double-click on an axis and modify units or zoom factors.
- To Export the Waveform into an image format, go to File->Export Image and save the waveform in an image format of choice.
- The output waveforms for the transient analysis of the inverter in 0.18um process looks like this.
4. To measure Power Dissipation Characteristics:
- Add a measure statement to your spice netlist to measure average power:
.measure tran avgpwr AVG power from=1ns to=20ns
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5. To measure max power:
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.measure tran peakpwr MAX power from=1ns to=100ns
- Add several different size output load capacitances:
- cload out 0 20fF
.alter
cload out 0 50fF
.alter
cload out 0 200fF - The netlist file with power-dissipation measurement: inv_power_018.sp.
- For HP 0.5um / TSMC 0.35um technologies, the corresponding files are inv_power_050.sp and inv_power_035.sp, respectively
- Compile the netlist file:
- Type:
grep ' avgpwr=' inv_power_018.lis|tail -3 - The average power will be output for each capacitance value. Take the average of the three values to get the average power dissipated.
- Repeat the above for peak power:
grep ' peakpwr=' inv_power_018.lis|tail -3 - Final Values: Average Power Dissipation: 19.44 uW
- Peak Power Dissipation: 452.23 uW
6. To measure Nodal Capacitance:
- Replace your .option statement with the following: (captab = capacitance table)
- .option captab post
- This will output the maximum capacitance for each node in your circuit onto the list file (or stty)
HSPICE from Synopsys can be used to simulate the circuits from the CMOS books.
- Download the book’s available HSPICE simulation examples in HSPICE_CMOSedu.zip.
- To ensure that HSPICE generates a data file for Avanwaves or Cscope add “.option post” to a netlist
- HSPICE netlists end in an “sp” (e.g. mynetlist.sp)
- HSPICE uses Level=49 for BSIM3 and Level=54 for BSIM4
- Syntax for a switch in HSPICE is:
GS1 n1 n2 VCR PWL(1) CLOCK,0 0.499,1m 0.501,10G
For example, if the voltage difference between nodes CLOCK and ground (0) transitions through 0.5V the switch, connected between nodes n1 and n2, will go from a short (1 milliohm) to an open (10 Gigaohms).
The Electric VLSI Design Information
- Below shows how Electric is setup where the Run Program path is (for example): C:synopsysHspice_A-2008.03-SP1BINhspice.exe
- Note that while the Run Program field is not case sensitive the “with args:” field is case sensitive (so use the uppercase names as seen)
- Also note the difference between the “with args:” field seen below and what is used with LTspice
- Electric outputs netlists with a *.spi extension.
- If you get an Exception Caught! when Electric loads simulation data it likely means that you have run out of memory. See number 15 here for how to increase the memory allocated to the JVM
Running HSIM from the command window (Start -> Run -> then type Cmd) in Windows
- Ensure the HSPICE model levels are used as indicated above (e.g., BSIM3 is Level=49 instead of Level=8)
- Use exact same netlist as used with HSPICE simulations except replace .options post with .print v(*) Level=1
- .print v(*) Level=1 saves node voltages from the main, or top level, cell. Level=2 stores node voltages from both the top level cell and the cells directly instanced in the top level cell (Level=3 stores the top three levels of hierarchy, ect.)
- HSIM can be run from the command prompt as seen below
- The errors can be viewed using a text editor in hsim.log
- The simulation output, hsim.fsdb, can be viewed using CosmosScope
- See the HSIM manual covering invoking HSIM for additional options
- If you get an Exception Caught! when Electric loads simulation data it likely means that you have run out of memory. See number 15 here for how to increase the memory allocated to the JVM
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