[SOLVED] Regarding gm vs compensation cap

[petelee]

Hi Analog expert~

I have a question regarding this material. Below is the link we can find in the website if you search for "Miller CMOS OTA Springer" with google.

https://www.google.com/url?sa=t&rct...=Qb7Bs9Oh6tXEPcT0WwVSVw&bvm=bv.57799294,d.b2I

From page 14, gm1=GBW*2*pi*Cc.
In the graph of page 18, the max value of 2*gm1 looks about 1.26mS when Cc=100pF. But if I calculate with the above formula from page14, it ends up with 126mS.
Am I missing something or is the book mistaken?

Thanks,

 

[Dominik Przyborowski]

On my calculation is gm1=0.63mS

 

[petelee]

Thanks a lot for confirming the number. You and the book are correct.

I just realized that I made a stupid mistake in my calculation with excel table.