Lecture 2 Flashcards
An electronic component created by “joining” an n-type material with a p-type material.
Semiconductor diode
The region of uncovered positive and negative ions is called
Depletion region
An internal contact that cannot be measured directly, its effects can be overcome by applying an external voltage of 0.3 V for Ge or 0.7 V for Si, in the correct polarity.
Vb
Vb ___ at higher temperature.
decreases
A semiconductor device with a single pn junction that conducts current in only one direction.
Diode
A two-terminal semiconductor device formed by two doped regions of silicon separated by a pn junction.
Modern Diode
Made from a small piece of
semiconductor material, usually Si, in which half is doped as a p region and half is doped as an n region with a PN junction and depletion region in between.
Diode
The p region is called the___ and is
connected to a conductive terminal.
Anode
The n region is called the ____ and is connected to a second conductive terminal
Cathode
A diode has three operating conditions which are ___
No bias, forward bias, and reverse bias
There is no applied voltage across the diode
No bias
It is established by applying the positive potential to the p-type
material and the negative potential to the n-type material.
Forward bias
It is stablished by applying external potential of V volts across the p-n junction such that the positive terminal is connected to the n-type material and the negative terminal is connected to the p-type material.
Reverse bias
When a diode is forward biased, the resistance of the diode is ____ and
there could be significant current flow across the diode depending on
the applied voltage across the terminals of the diode.
low
The voltage across a forward biased diode is no greater than __ volt.
1
When the anode of the diode is made negative with respect to the cathode, the diode is said to be
Reverse biased
The term ________ comes from the
fact that it reaches the maximum value quickly and does not change
significantly with increase in the reverse bias potential.
“saturation”
It is also called as Avalanche Breakdown and Zener
Breakdown
Reverse Breakdown
The multiplication of conduction electrons
Avalanche effect
it is applied when the diode is
forward or reverse
biased except when the
diode enters the Zener
region (diode current
rises abruptly).
Diode equation
The application of a ______ to a circuit containing a semiconductor diode will result in an operating point on the characteristic curve that will not change with time.
DC voltage
If the input signal is sufficiently large to produce a broad swing such as indicated in the figure, the resistance associated with the device for this region is called the
Average AC Resistance
It is the resistance determined by a straight line drawn between the two intersections established by the maximum and minimum values of input voltage.
Average AC Resistance
It is a perfect two-state device that exhibits zero impedance when forward biased and infinite impedance when reversed biased.
Ideal Diode Model
The real world diode rises at ___ V rather than 0 V
0.7
The resulting equivalent circuit is
called
piecewise-linear equivalent
circuit
The condition of a diode can be determined quickly using a
Digital display meter (DDM) / Digital Multimeter (DMM), Ohmmeter section of a multimeter, Curve Tracer
