I'm looking for a TL081/TL084 Model that accurately models power supply current.
The models on TI's site are deadly INACCURATE :-(
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |
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| 1962 | I love to cook with wine. Sometimes I even put it in the food.
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
That vender opamp models don't steer current from the supplies deals with their Boyle model ancestry.
I would recommend using LTspice's Universal Opamp model. It properly steers current from the supplies. You specify Avol, GBW, slew rate, current limit, phase margin, switch saturation voltage(how close the output gets to the rails), offset voltage, equiv. input voltage and current noise densities and corner frequencies for the particular opamp.
LTspice's Universal Opamp model does tend to be better than many of dedicated PSpice-style opamp models that get supplied by vendors based on the Boyle model.
I've added a lot of bells and whistles, but not yet the power-supply/load coupling.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
The documentation on LTspice's Universal Opamp model can be found in the schematic installed as
./examples/Educational/UniversalOpamp.asc
These models were recently updated in response to extensive field testing.
They use a transconductance with a hyperbolic tangent transfer function into the dominate pole to model GBW and slew and also give some onset of slew rate limited distortion as you approach the slew limit. The same symbol can model four different models each with increasing complexity. If you forego the phi margin specification, then level 2 is enough. It does Avol, GBW, slew rate, current limit, switch saturation voltage, offset voltage, equiv. input voltage and current noise densities and corner frequencies with a single internal node -- a technology otherwise unmatched in circuit simulation.
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