Hello Eli,
Additional to Robert's great suggestions:
We also have the analog engineer's calculator that has a tab for op amp noise but does not have a "cascading" option.
The Cascading Precision Op Amp Stages for Optimal AC and DC Performance application report does cover cascading noise considerations in Section 8.
All the best,
Carolina
Hi Eli,
the noise of this circuit can easily be simulated in TINA-TI:
In the simulation it is assumed that the source impedance is zero Ohm. If this is not the case in your application, the source impedance has to be added.
Two circuits are shown, one with the TLV9152 and another path with an ideal OPAmp. This allows to determine what portion of noise is coming from the 20k / 200p input low pass filters and what noise is coming from the OPAmp itself.
By the way, when I first run the
I didn't see any resistor noise. It turned out that someone has set the temperature of all resistors to -273.15°C which will entirely "knock out" the resistor noise. I changed it back to +27°C in the attached simulation file 
Kai
Hi Eli,
yes, the unit of "total noise" in the TINA-TI simulation is "Vrms":
So, the noise of the above circuit would be about 3µVrms in the band between 1Hz and 500Hz, under the assumption that the source impedance is zero.
Keep in mind, through, that you will only see the noise in the 500Hz band when you low pass filter the output signal accordingly. Otherwise you will also see the unfiltered broadband noise, as shown below:
Or by other words, when you omit the low pass filter at the output, you will see a noise voltage of about 25µVrms in the band between 1Hz and 1MHz, provided your signal processing has a bandwidth of 1Hz to 1MHz, e.g..
This post and the attached PDFs show how to calculate the noise by hand, if no Spice simulator is available. As you can see, the total noise is calculated by integration over the square of noise voltage density and taking the square root from the result. This makes sense when you look at the unit of noise voltage density, which is V/SQRT(Hz):
It's very sad that this and similar useful information is more and more disappearing from modern datasheets...
Kai
hi Kai
Really appreciate your help and professional answers
next step for me is to learn how to insert amp to TINA and simulate 
Many thanks
eli
Hey Eli,
There is a training series on ti.com: https://training.ti.com/tina-ti-tutorial
To answer your question, you may download the TINA model from ti.com (.TSM) and insert it into the program like this:
All the best,
Carolina
