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Device models for many of our ICs are available in the file thatcorp.lib
This library contains SPICE macro models for the following products:
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THAT4301
VCA and OA3 op-amp
THAT4301 RMS detector
THAT4301 OA1 op-amp
THAT4301 OA2 op-amp
THAT2180A
VCA
THAT2180B VCA
THAT2180C VCA
THAT2181A
VCA
THAT2181B VCA
THAT2181C VCA
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THAT2252 RMS
detector
THAT 1240 Line Receiver
THAT 1243 Line Receiver
THAT 1246 Line Receiver
THAT1200 InGenius Line
Receiver
THAT1203 InGenius Line Receiver
THAT1206 InGenius Line Receiver
Low noise NPN transistor
(THAT300 series)
Low noise PNP transistor (THAT300 series)
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The
macro models accurately model typical noise, offset voltage, bias
current, gain bandwidth, VCA distortion and other important parameters
necessary for accurate SPICE simulation.
Some important notes: One
cannot accurately simulate dynamic gain control while performing an
.AC analysis. This is because SPICE is performing a small signal
analysis on the devices based on how they are biased after the DC bias
portion of the simulation. Large signal behavior, such as the
exponential relationship between VBE
and IC
are not modeled, and this exponential relationship is fundamental to
the operation of THAT Corporation's log/anti-log VCAs. Performance
with static gain can be simulated with the .AC analysis, and dynamic
gain control can be simulated with TRAN (transient) analysis.
Also, the results of .AC analysis with THAT Corporation's RMS
detectors can be misleading, since the result only shows the ripple of
the RMS detector's log filter, and not the actual DC output. Transient
analysis yields the correct DC output, but the user may want to
experiment with the .IC statement to speed settling times for the log
filter.
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