Exam 2 Prep

Question 1

Approximations:
Strong forward bias

Answer 1

Exponential dominating
exp (VD/nVt)&raquo_space; 1

Question 2

Approximations :
Reverse bias

Answer 2

-1 dominating
|-1|&raquo_space; exp (VD/nVt)

Question 3

Diode “Junction” Area
I_S _____________

Answer 3

is proportional to junction area

Question 4

Temperature effects:
V_t =

Answer 4

= k_B T/q

Question 5

Temperature effects:
I_s = ______

Answer 5

= f(T)
* Rule of thumb: Is doubles for every 5 degrees C increase in T

Question 6

(1) Maximum forward current

Answer 6

I_Dmax

Question 7

Special Diode Types

Answer 7

-The Schottky-Barrier Diode (SBD)
-Varactor
-Photodiode
-Light-Emitting Diode (LED)

Question 9

The Schottky-Barrier Diode (SBD)

Answer 9

– Schottky diodes can be switched from on to off, and
vice versa, much faster than is possible with pn-junction
diodes
– The forward voltage drop of a conducting SBD is lower
than that of a pn-junction diode. e.g. 0.3 V to 0.5 V

Question 10

Varactor

Answer 10

voltage-variable capacitors

Question 11

Photodiode

Answer 11

light signals into electrical signals

Question 12

Light-Emitting Diode (LED)

Answer 12

converts a forward current into light

Question 13

MOSFET stands for

Answer 13

Metal Oxide Semiconductor
Field Effect Transistor

Question 14

MOSFET Terminals

Answer 14

*Gate
* Source
* Drain
* Body

Question 15

MOSFET Materials

Answer 15

• Metal (metallic layer)
• Oxide (insulating layer)
• Semiconductor
  Ptype
  N-type

Question 16

MOSFET Device Structure

Answer 16

Key Dimensions
* Oxide thickness, tox
* Channel length, L
* Channel width, W
* Junction depth, xj

Question 17

Qualitative Operation (No gate bias)
* No gate voltage
* Back-to-back _________

Answer 17

Diode → open-circuited → I_D =0

Question 18

Define V_T =

Answer 18

Threshold

Question 19

Two effects when v_GS > V_T

Answer 19

1)Conducting n-channel formed by
2)E-field

Question 20

Effect of v_DS

Answer 20

Positive current , I_D

Question 21

Dependence on (v_GS – V_T
) known as _

Answer 21

Overdrive voltage
V_OV = V_GS - V_T

Question 22

Voltage between gate and drain: v_GD =

Answer 22

V_GS-V_DS

Question 23

Channel pinches off when:

Answer 23

VGD <= VT

Question 24

Effect on i_D
:

Answer 24

Saturates, VGS - VDS  VT

Question 25

Define vDSsat =

Answer 25

VGS - VT

Question 27

Types of 3D printing
Hint: Earliest 3D method, based on UV-set polymers.

Answer 27

Stereolithography: SLA

Question 28

Types of 3D Printing: 2nd type ?

Answer 28

Digital light processing (DLP) :

Question 29

Primary difference between DLP AND SLA 3D printing ?

Answer 29

The primary difference between DLP and SLA is the light
source; SLA uses a UV laser beam while the DLP uses UV light
from a projector.

Question 30

3D Printing Types
Hint : one of the most
versatile 3D methods

Answer 30

FDM: Fused Deposition Modelling

Question 31

3D Printing
What does FDM stand for

Answer 31

Fused Deposition Modelling

Question 32

3D Printibg what does SLA Stabd For?

Answer 32

Stereolithography

Question 33

3D Printing: what does DLP stand for?

Answer 33

Digital Light Processing

Question 34

Schottky _____ Diode (SBD)

Answer 34

Barrier