HSPICE (Athena) Quickstart Guide If you really cannot access a PC to run LTSpice, you can complete your simulations using HSPICE, a non-graphical SPICE compiler available on Athena, and plot your output files using Avanwaves. Write your SPICE file using any text editor and save it with a .sp extension. There are main sections in a SPICE file are the following: A. The netlist: Netlist is a designation for a computer readable representation of the circuit schematic. B. The models: A model in SPICE is a description of the parameters of the equations used by spice to analyze the circuit. C. The analysis to be performed: For example, a DC sweep from 0 to 1.0 V with 0.01 V increments, or a transient analysis for 100 ps with step 0.01 ps. D. The end of the file: This isn’t really a main section, but HSPICE won’t work without it, and many people forget about it. Always put a .end statement at the end of your file. Also, note that HSPICE always treats the first line of your netlist as a comment. Use the same device models as given for LTSpice but with the .sp extension. A minimum size instantiation of the MOSFET models is shown below: X1 OUT IN VDD VDD PFET lg=1.5u wg=6u X2 OUT IN GND GND NFET lg=1.5u wg=6u A sample HSPICE inverter SPICE file may look like the following: * Netlist vdd 1 0 3 vin in 0 3 X1 OUT in 1 1 PFET lg=1.5u wg=6u X2 OUT in 0 0 NFET lg=1.5u wg=6u * Models .include 'filename.sp' * Analysis (DC Sweep) * post option necessary for awaves .options nomod post .dc vin 0 pvdd 0.01 .endTo run HSPICE on a SPICE file ‘[filename].sp’ and plot the results in Awaves, use the following commands: % add hspice % hspice filename.sp > filename.out & % awaves filename & Documentation for HSPICE and Awaves can be found at: /mit/hspice/Z-2007.03-SP1/hspice/docs/hspice_sa.pdf /mit/hspice/Z-2007.03-SP1/hspice/docs/avanwaves.pdf Note: Awaves does not run on Linux. To run plot your waveforms while on a Linux box: % ssh –Y x.dialup.mit.edu % add hspice % awaves name &MIT OpenCourseWare http://ocw.mit.edu 6.012 Microelectronic Devices and CircuitsSpring 2009 For information about citing these materials or our Terms of Use, visit:
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