DIODES Flashcards
Most basic semiconductor device that acts as a simple switch where the current flows in only one direction.
Diode
The characteristics of an ideal diode
conduct current in only one direction
The first electronic device to be introduced
*Is like a simple switch
Ideal Diode
Is formed by joining P-type and N-type material.
Semiconductor Diode
When the Anode is positive and Cathode is negative, is it a closed circuit or open circuit?
Closed Circuit
When the Anode is negative and the Cathode is negative, is it a closed circuit or open circuit?
Open Circuit
the net flow of charge in any one direction for a semiconductor diode is zero.
No Applied Bias
If an external potential of V volts is applied 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.
Reversed Bias
The current that exists under reverse-bias conditions
Reverse Saturation Current
typically in the nanoampere range for
silicon devices and in the low-microampere range for germanium.
Saturation Current Level
established by applying the positive potential to the p-type material and the negative potential to the n-type material
Forward Bias
There is a point where the application of too negative a voltage will result in a sharp change in the characteristics
Zener Region
The reverse-bias potential that results in this dramatic change in characteristics
Zener Potential
The maximum reverse-bias potential that can be applied before entering the Zener region
Peak Inverse Voltage
The reverse saturation current Is will just about double in magnitude for every ____ increase in temperature.
10°C
The application of a dc voltage to a circuit containing a semiconductor
diode will result in an operating point on the characteristic curve that
will not change with time
DC or Static Resistance
The varying input will move the instantaneous operating point up and down a region of the characteristics and thus defines a specific change in current and voltage
AC or Dynamic Resistance
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
This is the 1st Approximation in Diode circuit analysis
often made without a serious loss in accuracy
Ideal Diode
*It states that a forward-biased silicon diode in an electronic system
under dc conditions has a drop of 0.7 V across it in the conduction
state at any level of diode current
Simplified Equivalent Circuit
*One technique for obtaining an equivalent circuit for a diode is to
approximate the characteristics of the device by straight-line
segments.
Piecewise-Linear Equivalent
Which of the three equivalent circuits is the most accurate model?
Piecewise-Linear
