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You may want to look at Intersil's AN1556. See:
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The author makes this claim about his method "Finally, Accurate SPICE
Models I can Understand and Modify to Fit my Simulation Needs. The
authors model "enables the user to simulate important AC and DC
parameters of an amplifier. AC parameters incorporated into the model
are: 1/f and flat-band noise, slew rate, CMRR, gain and phase. The DC
parameters are V_OS , I_OS , total supply current and output voltage
swing."

Limitations of the model are:
"25 Deg C only, no temperature dependence
No current noise capability
Does not provide supply current as a function of load current"

Howard

On 9/14/2011 6:54 AM, Ganesan wrote:

Thanks for the suggestions.. I will get back in a few days..
My more complicated models which I did not post are Gm and R based..
However my most complicated model seems to be much simpler than what is
commercially available? They also have a disclaimer that they don't
model offset, psrr, cmrr etc.? What gives..
This question still remains unanswered..
Cheers
ag

--- In LTspice@...

<mailto:LTspice%40yahoogroups.com><mailto:LTspice%40yahoogroups.com>,

"Apparajan"<dg1@> wrote:

I have uploaded my model
Temp-->File-->>E_model_for_diffamp.asc
It is a very simple model that models the differential and common

mode loop gains. I have other more complicated models that model
slew-rate, bandwidth, etc. However my most complicated model seems to be
much simpler than what is commercially available? They also have a
disclimer that they don't model offset, psrr, cmrr etc.? What gives...