4. Shown below is a common source with an ideal current source load. Notice that the current of M1 will always be the same with the ideal current source. Now, describe the effect of varying vin to the circuit. Show proof. (Hint: consider the non-ideal effects.) VDD V out

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4. Shown below is a common source with
an ideal current source load. Notice
that the current of M1 will always be
the same with the ideal current
source. Now, describe the effect of
varying vin to the circuit. Show proof.
(Hint: consider the non-ideal effects.)
VDD
V out
in
M1
Use this as guide
CMOS Amplifiers
VDD
VoD
m21'02
Vout
Vout
VinHEM,
Vino-
M1
(b)
(a)
Figure 7.10 (a) CS stage
a PMOS device as a current source, (b) small-signal model.
output impedance [Fig. 7.10(b)] because vi = 0 and hence gm2V1 = 0. Thus, the drain node
of M1 sees both roi and ro2 to ac ground. Equations (7.46) and (7.48) give
A, = -gmi (ro1||ro2)
(7.52)
(7.53)
Rout = roi||ro2.
Transcribed Image Text:4. Shown below is a common source with an ideal current source load. Notice that the current of M1 will always be the same with the ideal current source. Now, describe the effect of varying vin to the circuit. Show proof. (Hint: consider the non-ideal effects.) VDD V out in M1 Use this as guide CMOS Amplifiers VDD VoD m21'02 Vout Vout VinHEM, Vino- M1 (b) (a) Figure 7.10 (a) CS stage a PMOS device as a current source, (b) small-signal model. output impedance [Fig. 7.10(b)] because vi = 0 and hence gm2V1 = 0. Thus, the drain node of M1 sees both roi and ro2 to ac ground. Equations (7.46) and (7.48) give A, = -gmi (ro1||ro2) (7.52) (7.53) Rout = roi||ro2.
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