DIODES Flashcards
the junction diode is formed when an n-type and a p type materials are brought together.
-P-N JUNCTION DIODES
p region is connected to a conductive terminal. p region is called what?
-ANODE
n region is connected to a second conductive terminal. n region is called what?
-CATHODE
condition of the diode without any supply voltage.
-DIODE NO BIAS
the region of uncovered positive and negative ions.
-DEPLETION REGION
in the absence of an applied bias voltage, the net flow of charge in any one direction for a semiconductor diode is
-ZERO
is the condition that allows current through the pn junction.
-DIODE FORWARD BIAS
extremely small current that exists in reverse bias after the transition current dies out is caused by the minority carriers in the n and p regions.
-REVERSE CURRENT
if the external reverse bias voltage is increased to a value called the breakdown voltage, the reverse current will drastically increase.
-DIODE REVERSE BREAKDOWN
the multiplication of conduction electrons is known as the
-AVALANCE EFFECT
Vth is the required voltage across junction of the diode before forward current flow.
-THRESHOLD VOLTAGE
the magnitude of current the diode can handle without burning when forward biased.
-FORWARD CURRENT
the required voltage in order to produce forward current or the voltage drop across the diode when conducting.
-FORWARD VOLTAGE
the magnitude of current that will leak when the diodes is reversed biased, ofentimes called leakage current.
-REVERSE CURRENT
the maximum reverse voltage that can be applied before current surges.
-REVERSE BREAKDOWN VOLTAGE
the time taken by the diode to operated in the reverse condition from forward conduction.
-REVERSE RECOVERY TIME
the maximum power the diode can handle without burning.
-MAXIMUM POWER DISSIPATION
the reduction of power handling capability of the diode due to the increase of ambient temperature from room temperature.
-LINEAR POWER DERATING FACTOR
the maximum temperature the diode can operate before burning its junction.
-MAXIMUM JUNCTION TEMPERATURE
diffusion capacitance or storage capacitance
-FORWARD BIAS CAPACITANCE
transition capacitance or depletion region capacitance
-REVERSE BIAS CAPACITANCE
diode capacitance is equivalent to an open circuit.
-LOW FREQUENCY
diode capacitance is equivalent to a short circuit.
-HIGH FREQUENCY
Defined as a point on the characteristic curve.
-DC OR STATIC RESISTANCE
defined by a tangent line at the q point
-AC OR DYNAMIC RESISTANCE
defined by a straight line between limits of operation
-AVERAGE AC RESISTANCE
a silicon pn junction device that is designed for operation in the reverse-breakdown region.
-ZENER DIODE
designed to operate in reverse breakdown.
-ZENER BREAKDOWN
two types of reverse breakdown in a zener diode are
-AVALANCHE AND ZENER
always operates in reverse bias and is doped to maximize the inherent capacitance of the depletion region.
-VARACTOR DIODES
acts as a capacitor dielectric because of its nonconductive characteristics.
-DEPLETION REGION
a seminconductor that emitts visible light when forward biased. produced as the electron and hole recombines and release energy.
-LIGHT EMITTING DIODE
converts ac to dc
-RECTIFIER CIRCUITS
process of removing 1/2 of the input signal.
-HALF WAVE RECTIFICATION
uses the full 360 degree cycle of the input signal
-FULL WAVE RECTIFICATION
most familiar full-wave rectifier circuit. uses four diodes.
-BRIDGE FULL TYPE RECTIFIER
uses only two diodes but center tapped tranformer is required.
-FULL WAVE RECTIFIER WITH CENTER TAPPED TRANSFORMER
have the ability to clipp off a portion of the input signal. usually uses one resistor and one diode.
-CLIPPER/CLIPPING
TWO CATEGORIES OF CLIPPERS
- SERIES CLIPPERS
- PARALLEL CLIPPERS
defined as one where the diode is in series with the load.
-SERIES CLIPPERS
has the diode in a branch parallel to the load
-PARALLEL CLIPPERS
can empty independent dc supply to introduce an additional shift clamping
-CLAMPER
stepping-up the ouput voltage
-VOLTAGE MULTIPLIER
a half-wave voltage doubler/full wave doubler
-VOLTAGE DOUBLER
also called variable capacitance
-VARACTOR DIODE OR VARICAP DIODE
