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You may know it, I shall allow. But it's not clear what you are asking, equation itself or the source that you can refer. Since the latter covers the first I'm going to answer that: open Gray&Meyer Analysis and Design of Analog Integrated Circuits (The one I have is third edition) and on page 76 you'll find a surprise in equation 1.218. If you have a different edition just open the index and look for subthreshold, it's like googling but ancient.
Thanks for your sharing.
I could not get the 3rd version, but i get from the 5th version. Is this the equation u mentioned?
Btw how am i going to put Vt in equation? since i m going to create the graph as below.So i need know it value in order to fix some values such as C, f, CLoad to optimise the design.
You might have already noticed that there are two Vt's here. One is transistor's threshold voltage and the other one is the 25.8mV thing, I forgot its name, so put them in, don't ask me its value. It's not a question I can answer, look at the index of the same book to find out how to calculate it as it changes from design to design or with temperature and a lot of stuff.
Weird thing is the equation is almost the same in 3rd edition except in the one you shared it's Vgs - Vt and in my book it's only Vgs for the first exponential. This is a huge difference and I need to check.
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