ECE 4452 - Midterm Exam Questions
With 100% Verified Answers
Photolithography: -
correct answer ✅Photo-imaging method by which geometric
patterns are transferred from a mask to the substrate (wafer) by
shining light through glass plates (called "masks") onto a
photoresist layer.
Key Steps: -
correct answer ✅4 Oxidations , 3 Pre-Depositions, and 6
Mask/Lithography Steps
Pre-Deposition Steps: -
correct answer ✅1) p-well
2) p+ S/D
3) n+ S/D
Things Fabricated: -
correct answer ✅FET, Inverter, Resistor, Capacitor, NAND, NOR,
Ring Oscillator
Moore's Law -
correct answer ✅The number of transistors per chip
doubles about every 2 years.
,ECE 4452 - Midterm Exam Questions
With 100% Verified Answers
Affects of Moore's Law -
correct answer ✅Decreased Channel Length
Decreased Power Consumption in Scaling
Cheaper Manufacturing Prices
Increases Speed
Hot Probe Test -
correct answer ✅Determines Carrier Type
- Energetic Majority carriers flow from hot to cold probe
- N-Type is Negative current
- P-Type is Positive Current
4-Point Probe Test -
correct answer ✅Determines Resistivity
- Known current (I) passed through outer probes
- Potential (V) developed across inner probes
Sheet Resistance Formula -
correct answer ✅Rs = (V/I)F = ρ/t
, ECE 4452 - Midterm Exam Questions
With 100% Verified Answers
How many high temperature steps are there? -
correct answer ✅7
What are each of the 6 masks used for? -
correct answer ✅1) p-well diffusion
2) p+ S/D diffusion
3) n+ S/D diffusion
4) gate oxidation
5) contact window
6) metal contacts and interconnect
Oxidation: -
correct answer ✅Process by which a layer of silicon dioxide (SiO2)
is grown on a silicon substrate by exposing it to oxygen (O2) or
water vapor (H2O) ambient.
Applications of Oxide in MOS Structures: -
correct answer ✅1)Serves as high quality insulator ( gate oxide) in
devices like MOSFET'S
2) Serves as a mask to prevent diffusion into an area
With 100% Verified Answers
Photolithography: -
correct answer ✅Photo-imaging method by which geometric
patterns are transferred from a mask to the substrate (wafer) by
shining light through glass plates (called "masks") onto a
photoresist layer.
Key Steps: -
correct answer ✅4 Oxidations , 3 Pre-Depositions, and 6
Mask/Lithography Steps
Pre-Deposition Steps: -
correct answer ✅1) p-well
2) p+ S/D
3) n+ S/D
Things Fabricated: -
correct answer ✅FET, Inverter, Resistor, Capacitor, NAND, NOR,
Ring Oscillator
Moore's Law -
correct answer ✅The number of transistors per chip
doubles about every 2 years.
,ECE 4452 - Midterm Exam Questions
With 100% Verified Answers
Affects of Moore's Law -
correct answer ✅Decreased Channel Length
Decreased Power Consumption in Scaling
Cheaper Manufacturing Prices
Increases Speed
Hot Probe Test -
correct answer ✅Determines Carrier Type
- Energetic Majority carriers flow from hot to cold probe
- N-Type is Negative current
- P-Type is Positive Current
4-Point Probe Test -
correct answer ✅Determines Resistivity
- Known current (I) passed through outer probes
- Potential (V) developed across inner probes
Sheet Resistance Formula -
correct answer ✅Rs = (V/I)F = ρ/t
, ECE 4452 - Midterm Exam Questions
With 100% Verified Answers
How many high temperature steps are there? -
correct answer ✅7
What are each of the 6 masks used for? -
correct answer ✅1) p-well diffusion
2) p+ S/D diffusion
3) n+ S/D diffusion
4) gate oxidation
5) contact window
6) metal contacts and interconnect
Oxidation: -
correct answer ✅Process by which a layer of silicon dioxide (SiO2)
is grown on a silicon substrate by exposing it to oxygen (O2) or
water vapor (H2O) ambient.
Applications of Oxide in MOS Structures: -
correct answer ✅1)Serves as high quality insulator ( gate oxide) in
devices like MOSFET'S
2) Serves as a mask to prevent diffusion into an area
