Strange formula

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1 total messages Started by Roland Bengtsson Tue, 01 Jan 2002 14:07

#153

Author: Roland Bengtsson
Date: Tue, 01 Jan 2002 14:07

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I'm doing a course in VLSI and our book is "Principles of CMOS VLSI
Design" from Addison Wesley. I have found a formula I don't understand
on page 75.

It's about to calc Vout for a pseudo-nMOS inverters.

Vout = -Vtp + sqrt((Vdd + Vtp)^2-C)

and

C = k(Vin - Vtn)^2

and

k = Bn/Bp

and

Bn/Bp = ((Vdd + Vtp)^2 - (Vout + Vtp)^2)/(Vin - Vtn)^2

As seen Vout depends on Bn/Bp that depends on Vout and I can't
understand this... I appreciate if someone can explain this for me!

Regards Roland

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