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4 Current Source Reference
Figure 4 shows a current reference circuit. For this problem, use the transistor parameters
in Table 4. For the circuit in Figure 4, assum e the following circuit parameters: R = 10 kD ,
(WI Lh = (WI Lh, (WI L)3 = 2, and (WIL). = (WIL)5 = (WIL )6 = 6.
Parameter NMOS PMOS
Vi
lY -1 Y
Ld 0 0
X d 0 0
k' 300 /t Aj y
2
100/tAj y
2
"I
0 0
A 0 0
Table 4: Problem 4 Transistor Parameters.
Problem 4.1 (6 p oints) Find (WI L) I = (WI L hand (WI L h such that J 0 is dependent
on process parameters only (i.e., independent of bias point to first order).
K\lL (Iootto.",'): \/(,53 + "R.::: Vr;,Si + Vc"S2 + l-\I(,57)
VII-:' ~'(\ -\- V",,1. ... V-t;

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