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cascode on paper/cadence

Discussion in 'CAD' started by Matteo, May 14, 2007.

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  1. Matteo

    Matteo Guest

    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:

    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..)
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