K'n=μnCox=200 μA/V², K'p-μpCox-80 μA/V², VLIN|= infinite
Vto,N= |Vto,P|= 0.5V, PHI= |20F|=0.85V for N and P, y=0.3 V0.5, λ=0.1 V-¹/n1) Current Mirror:
a. The simple mirror in Fig. 1(a) is designed with W/L to have gm-0.25mA/V at 20 μA for
the input leg of the mirror with W/L ratio on the output leg 6X larger. If Iref = 20 μA,
calculate the output current for Vout = 0.5, 1.0, and 2.0V.
b. The mirror is updated to be a standard cascode current mirror in Fig. 1(b), using the
same W/L ratios as above for the input leg and output leg. If Iref = 20 µA, calculate the
output current for Vout = 0.5, 1.0, 2.0V.
c. Calculate the output resistance of these two circuits. Using this resistance, estimate
how much the current should change for a 1V change in output voltage change. How
does this compare to your answers in (a) and (b)?
M1
IREF
VDD
Fig. 1(a)
M2
Vout
M1
M3
IREF
VOD
Fig. 1(b)
M2
M4
Vout
Fig: 1
Fig: 2