MICROELECTRONIC CIRCUITS- EXAM
3 MULTIPLE CHOICE QUESTIONS &
ACCURATE ANSWERS RATED 100%
CORRECT
A MOS Capacitor consists of three regions:
a) Metal, Semiconductor, and metal regions
b)metal, semiconductor, and plastic
c) metal, oxide, and semiconductor
d) wood, cement and gravel - Correct Answer ✔✔ C) Metal, Oxide, and Semiconductor
MOSFETs always need a non-zero Gate to Source Voltage to conduct a Drain-Source
Current (remember to consider PMOS and NMOS enhancement and depletion devices)
T/F - Correct Answer ✔✔ False
Feedback always has to be negative otherwise the circuit will not work
T/F - Correct Answer ✔✔ False
The body terminal of a MOSFET should always be connected to ground, regardless of
whether the device is PMOS or NMOS
T/F - Correct Answer ✔✔ False
The gate current in the MOSFET is:
a) highest under large positive gate bias
b) highest under large negative gate bias
c) determined by the change in fermi level position at the semiconductor-oxide interface
d) is always zero
e) is zero except in inversion - Correct Answer ✔✔ d) is always zero
A depletion Mode PMOS transistor has a
a) p-type substrate
b) n-type substrate
c) n-type channel when biased into cutoff (either depletion or accumulation
d) huge gate current - Correct Answer ✔✔ b) n-type substrate
For a transresistance amplifier designed for maximum gain:
a)high input impedance
b)low input impedance
c)high output impedance
d)low output impedance
e)voltage output - Correct Answer ✔✔ b) low input impedance
d) low output impedance
, e) voltage output
"Op-amp" stands for:
a) Oh Pooh!
b)Operating Amplifier
c) Operational Amplifier
d)Oh please help me! - Correct Answer ✔✔ c) operational amplifier
When a "real world" (Non-ideal) Op-Amp is used in a circuit that uses negative feedback
(part of the output is fed back to the negative input terminal) it is possible that the input
resistance of the circuit is higher than the input resistance of the Op-Amp
T/F - Correct Answer ✔✔ True
A MOS Transistor can be:
a) enhancement mode NMOS
b) depletion mode PMOS
c) enhancement mode PMOS
d) depletion mode NMOS
e) All of the Above - Correct Answer ✔✔ e) all of the above
Depletion Mode MOS transistors have large DC gate currents but enhancement mode
MOS transistors have no DC gate current
T/F - Correct Answer ✔✔ False
A "real world" (Non-ideal) Op-Amp has infinite open loop gain
T/F - Correct Answer ✔✔ False
The following condition defines the triode or linear region of operation of a NMOS
Enhancement mode Transistor
a) V(GS)<V(T) and V(DS)<V(GS)-V(T)
b)V(GS)>V(T) and V(DS)<V(GS)-V(T)
c)V(GS)>V(T) and V(DS)>V(GS)-V(T)
d) All of the above - Correct Answer ✔✔ b)V(GS)>V(T) and V(DS)<V(GS)-V(T)
For a MOSFET biased into saturation, the channel:
a) acts like a resistor connecting source to drain
b) does not exist due to this region being fully depleted
c) acts like a resistor connecting source to drain but has a depleted region at the drain
end
d)needs to be changed because there is never anything good on TV anyway
e) None of the Above - Correct Answer ✔✔ c) acts like a resistor connecting source to
drain but has a depleted region at the drain end
Gauss's law as applied to the oxide-semiconductor interface states that the electric field
in the semiconductor is equal to the electric field in the oxide.
T/F - Correct Answer ✔✔ False
3 MULTIPLE CHOICE QUESTIONS &
ACCURATE ANSWERS RATED 100%
CORRECT
A MOS Capacitor consists of three regions:
a) Metal, Semiconductor, and metal regions
b)metal, semiconductor, and plastic
c) metal, oxide, and semiconductor
d) wood, cement and gravel - Correct Answer ✔✔ C) Metal, Oxide, and Semiconductor
MOSFETs always need a non-zero Gate to Source Voltage to conduct a Drain-Source
Current (remember to consider PMOS and NMOS enhancement and depletion devices)
T/F - Correct Answer ✔✔ False
Feedback always has to be negative otherwise the circuit will not work
T/F - Correct Answer ✔✔ False
The body terminal of a MOSFET should always be connected to ground, regardless of
whether the device is PMOS or NMOS
T/F - Correct Answer ✔✔ False
The gate current in the MOSFET is:
a) highest under large positive gate bias
b) highest under large negative gate bias
c) determined by the change in fermi level position at the semiconductor-oxide interface
d) is always zero
e) is zero except in inversion - Correct Answer ✔✔ d) is always zero
A depletion Mode PMOS transistor has a
a) p-type substrate
b) n-type substrate
c) n-type channel when biased into cutoff (either depletion or accumulation
d) huge gate current - Correct Answer ✔✔ b) n-type substrate
For a transresistance amplifier designed for maximum gain:
a)high input impedance
b)low input impedance
c)high output impedance
d)low output impedance
e)voltage output - Correct Answer ✔✔ b) low input impedance
d) low output impedance
, e) voltage output
"Op-amp" stands for:
a) Oh Pooh!
b)Operating Amplifier
c) Operational Amplifier
d)Oh please help me! - Correct Answer ✔✔ c) operational amplifier
When a "real world" (Non-ideal) Op-Amp is used in a circuit that uses negative feedback
(part of the output is fed back to the negative input terminal) it is possible that the input
resistance of the circuit is higher than the input resistance of the Op-Amp
T/F - Correct Answer ✔✔ True
A MOS Transistor can be:
a) enhancement mode NMOS
b) depletion mode PMOS
c) enhancement mode PMOS
d) depletion mode NMOS
e) All of the Above - Correct Answer ✔✔ e) all of the above
Depletion Mode MOS transistors have large DC gate currents but enhancement mode
MOS transistors have no DC gate current
T/F - Correct Answer ✔✔ False
A "real world" (Non-ideal) Op-Amp has infinite open loop gain
T/F - Correct Answer ✔✔ False
The following condition defines the triode or linear region of operation of a NMOS
Enhancement mode Transistor
a) V(GS)<V(T) and V(DS)<V(GS)-V(T)
b)V(GS)>V(T) and V(DS)<V(GS)-V(T)
c)V(GS)>V(T) and V(DS)>V(GS)-V(T)
d) All of the above - Correct Answer ✔✔ b)V(GS)>V(T) and V(DS)<V(GS)-V(T)
For a MOSFET biased into saturation, the channel:
a) acts like a resistor connecting source to drain
b) does not exist due to this region being fully depleted
c) acts like a resistor connecting source to drain but has a depleted region at the drain
end
d)needs to be changed because there is never anything good on TV anyway
e) None of the Above - Correct Answer ✔✔ c) acts like a resistor connecting source to
drain but has a depleted region at the drain end
Gauss's law as applied to the oxide-semiconductor interface states that the electric field
in the semiconductor is equal to the electric field in the oxide.
T/F - Correct Answer ✔✔ False
