EE 8185 Low Power Analog Circuit Design

Homework 2 (Due Thursday April 30th)

 1) Find the total noise current spectral density (flicker + Thermal/Shot)
    for the following circuit. Do not neglect the noise for any of the 
    transistors. M1, M2, and M3 are NMOS transistors and Q1, Q2 are lateral 
    bipolar transistors with their MOS gates tied to -2 volts. 

    
    | Vdd               |  Iin            |   Iout  (find noise and ro here)
    |             |-----|                 |
    |             |     |                 |
    ---|          |  |---              |---
       |-------------|-----------------|
    <--|             |-->              |-->
    |                   |                 |
    |  M1         M2    |            M3   |
    |                   |                 |
    |                   |                 |
    |                   |                 |
    |                   |                 |
    |             Q1    |            Q2   |
    |                  /                 /
    |               | /               | /
    |---------------| \---------------| \
                       \>                \>
                        |                 |
                        |                 |
                        |                 |
                       ---               ---


 2) Find the effective ro (small-signal) output impedance for the current
    mirror shown above. Find a symbolic solution.