Fundamentals of Analogic Design
PROBL EM Assume all facing transistor are identical and biased the saturation
region Ignore the body-effect for all transistors Consider the channel-lengti modulation
a) Find the DC gain (As) of the amplifier circuit in Fig 1
b) Determine the approximate transfer function A (jco). The amplifier circuit
through inspection Consideronly 3 poles
Note: Assume load capacitance of node Assume only the Cas
of the transistors contributes tothe parasitic capacitance.
c) Find the input-referred noise of the circuit Note: Consider only the thermal noise
Note: Forthe fully differential amplifier circuit o Fig.2 assume that al NMOS transistors
are identical (i.e. they have equal gna and transistors are identical as
well (i.e. they have equal gmp Ignore the body effect and consider the channel-
length modulation effect Itransistors
a) Find the differentialDO gain (Aoc)
the transistors have only Cos as their parasitic capacitor (the sarne for both
NMOS and PMOS), find the approxirnate transfer function Adico). The amplifier
c) Find the input-referred noise of the amplifier circuit Note: consider only the
contributions of the thermalnoise.
Note: Assume that the OPAMP in Fig. 3 has a single pole its output node that
is dominated by the "C". The open-loop DO gain the OPAMP is
"Ao" The output resistance OPAMPi 'Raj' Fig illustrates the Bode plotof the
OPAMP n the open-loop (see Fig. 3a).
a) Find the loop gain transfer function, L(jco). for the amplifier circuit in Fio 3(c)
Hint: L(jo) is defined the product fthe OPAMP open-loop transfer function
A(joo) and the feedback factor f
b) Find the close loop transfer function Acu (jco)o the amplifier circuit in Fig. 3(c)
Ignore the loading effects of the feedback on DC gain. Draw the Bode plot
Note: Express the closed-loop 3dB bandwidth and closed loop unity-gain
bandwidth as function ftheir open-loop counterparts
Note: Assume that the transistorsi Fig are biased the saturation region Consider
both the channel-length modulation effect and the body-effect your calculations
Find the noise contribution of M2 to Vout
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