Homework 4
Due: Mon. Feb. 14.

 

For the following problems, assume K’ = 100 uA/V2, VT = 0.7V, and λ = 0.04V-1 for the NFETS and that the PFETs have the same value only negative.

1.      For the following differential amplifier, find A­v and rout when ISS = 10 uA and Vin = V1 – V2. 


Extra credit: For the above, find the minimum and maximum common mode input voltage (i.e. as if V1 = V2) if all FETs are to remain in saturation.

2.      Find A­v,  rout, and the range of Vout for the source follower discussed in class when VDD = -VSS = 5 V, W/L = 2/1 for M1, M2, and M3, and IBIAS = 50 uA.

3.      For the following op-amp, find A­v, rout, and the permissible range of Vin and Vout.


4.      For the above op-amp, it is determined that the gain is to low and output resistance to high.  Name some things you could do to simultaneously correct these problems (i.e. to raise A­v and lower rout).

5.      For the following op-amp, clearly identify any a) current mirrors, b) current sources or sinks, c) amplifiers (please identify the type of amplifier – differential, inverting, source follower, cascode, etc), and f) any loads (Identify the type of load we are looking at - e.g. active resistor, current mirror, etc. ).  Note that a particular FET or set of FETs may fall under multiple categories (e.g. a differential amplifier load may also be a current mirror).  VB1, VB2, and VB3 are DC bias voltages.  Once you’ve identified the basic components of the op-amp, explain approximately how the device works (just a few sentences).


 

Tuesday, 08-Feb-2005 18:23:11 CST

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