hi all! I would like to design a cascode configuration and my target are:
- gain 20
- Vout DC = 1.8 volt
I calculated some values on paper and I simulated my circuit but the results are completely different! my circuit is here:
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if I want Vout = 1.8V Rd*Id = 1.5V; Rd = 600ohm so Id = 2.5mA
if I want Av = gm2 * (Rd//r02) = 20 I have to choose Vov = 0.10V and so Vgs = 668mV
if I want Id = 2.5mA and Vov = 0.10 W has to be W=1080u
...I set these values in cadence but the risult is completely different! Can you try to explain me why? any help is appreciated
thank you (and sorry for my english..)