Designing an amplifier (in cadence)

Discussion in 'Homework Help' started by Blackdragon, Nov 10, 2012.

  1. Blackdragon

    Thread Starter New Member

    Nov 10, 2012

    So I am given a task to design an amplifier with a current source which I have to design as well (but for now, I just want the amplifier to work, so I have used the default IDEAL CURRENT SOURCE symbol and set a value for it).

    Do you guys have any tips? I have posted some pictures below of my circuit and simulation results.. any pointers? What should I use for my width and lengths for each transistor (because they are default right now)? I'm completely lost and any first step pointers would be appreciated.

    I will outline my steps thus far:
    1) Designed a simple amplifier with a ideal current source.
    2) Left the W/L ratio as default (L = 100u, W = 120u).
    3) Set VDC for the VDD to 1.8V
    4) Set Ideal current source to 15uA
    5) Ran a DC Sweep (For variable VIN from -1.5 to 1.5 with 0.01 step size (linear))
    6) Outputs to be plotted are: + terminal for VIN and -VIN and the OUT pin.

    What am I doing wrong? I dont even know if the results below are correct... any tips to check?
    Last edited: Nov 10, 2012