3 stage multi amplifier help!!

Discussion in 'Homework Help' started by ecjohnny, Oct 22, 2011.

  1. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    Can anyone give me some help on this. i need do hand in this assignment soon and i am have totally no idea how to solve it. .

    Circuit diagram :

    A multistage amplifier is shown in Fig. 9-1. You may assume that the body and the source
    terminals of the NMOS and PMOS are connected together, i.e. no body effect for NMOS and
    PMOS. You may also assume the following device parameters and all pnp BJT, NMOS and
    PMOS devices are identical:
    • β=100, VA=100, Cπ=4.9pF, Cμ=1.7pF
    • Kn=2mA/V2, VTHN=1V, λn=0.001V-1 , Cgd=0.5pF, Cgs=5pF
    • Kp=2mA/V2, |VTHP|=1V, λp=0.001V-1, Cgd=0.5pF, Cgs=5pF

    1) Find out the small signal AC parameter for Q1A and M1A?
    Obtain the expression for the small signal gain (vout/vs) of the amplifier. 2)AssumeRD1=RD2, design RD1 such that the small signal gain=100.
    3) Estimate the Rin and Rout using RD1 and RD2 value in Question 1.
  2. Georacer


    Nov 25, 2009
    The Homework Help section asks that you post up the work you have done so far, so we can see it and find where you went wrong, or suggest better approaches. We will not do all your work for you, no matter how little time is left before it must be submitted.

    If you are in doubt about how to structure your post and what to include please read this thread: http://forum.allaboutcircuits.com/showthread.php?t=3002

    Thank you.