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continued frompage 10
analog/digital "code models" for
behavioral simulation, and Cider
(previously CODECS, from UC
Berkeley/Oregon State Univ.) which
added semiconductor device
simulation. The integrated circuit
industry adopted SPICE quickly, and
until commercial versions became well
developed many IC design houses had
proprietary versions of SPICE. Today a
few IC manufacturers, typically the larger
companies, have groups continuing to
develop SPICE-based circuit simulation
programs. Among these are ADICE at
Analog Devices, LTspice at Linear
Technology, Mica at Freescale
Semiconductor, and TISPICE at Texas
Instruments. (Other companies maintain
internal circuit simulators which are not
directly based upon SPICE, among them
PowerSpice at IBM, Titan at Qimonda,
Linx at Intel Corporation, and Pstar
at NXP Semiconductor.)
To answer your question, the
analog SPICE simulators can incorporate
"digital" functions (which we covered
in the series). This is very helpful for
circuits that are both analog and digital
(such as an analog comparator that
outputs a logic signal). For larger logic
circuit simulations, the industry uses
other simulation tools. The most popular
is called VERILOG (licensed from
Cadence). It’s similar to the C languague
and used to construct (and verify)
complex logic such as FPGAs. (http://
While Verilog is used for complex
simulation, simple digital simulation can
be done with IBIS tools. It’s common for
analog IC vendors to issue IBIS models
along with PSPICE models.
Here's the wikipedia entry:
Regarding my "Inductive Proximity
Sensor" article in the March issue ...
there was a slight error on the web link
that should be corrected.
The link that has www.obex.
parallax.com should read obex.
parallax.com instead. This was my fault.
It was actually a placeholder in the
article I wrote and the template that I
was using had the incorrect address.
The above link ( obex.parallax.com)
is correct and will get the user to the
object exchange. The Direct link to
the actual software within the object
exchange can be found at obex.
I apologize for any inconvenience
this may have caused.
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