Problem 4: Consider the pMOS current mirror

circuit shown in Figure 4. Assume that the

transistors are identical in all parameters. Do not

ignore channel length modulation. Show that

Ix

· ≈ 1 + | 2₂ | (VG − V x )

IB

where VG is the common gate voltage.

(15 points)

MI

3

Is

W/L

W/L

Figure 4

It