Download Analog CMOS Integrated Circuits Exercise 7: Operational Amplifier 1

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High-Frequency Electronics
Prof. Dr.-Ing. Andreas Thiede
Analog CMOS Integrated Circuits
Exercise 7: Operational Amplifier
1.
Determine
the
VDD
voltage gain of the
depicted amplifier as
Mb5
M17
M18
Mb4
M15
M16
a function of the gm
and
rds
of
M23
M24
the
Mb3
respective FET !
Neglect body effect !
M13
M11
VIN
M14
M12
M21
M22
VOUT
Mb2
Mb1
2.
VDD
So called Regulated Cascodes are used in operational
amplifiers for Gain Boosting . Determine the small signal
gain of the circuit and compare the result with a double
VOUT
M2
cascode !
Neglect body effect !
M3
VIN
3.
M1
The figure on backside compares a so called Telescopic Cascode operational amplifiers to
a Folded Cascode operational amplifier. Compare the input and output common-mode
range of both circuits , which allows operation of all MOSFET in on-state and saturation !
VDD
VDD
VOUT
Vb
M3
M1
VIN
VOUT
M1
M4
M2
VIN
M2
Vb
M3
M4
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