A semiconductor device that allows current to flow in one direction only.
To convert alternating current (AC) to direct current (DC).
To allow current to flow in the reverse direction when a specific voltage is reached.
A light-emitting diode that emits light when current flows through it.
To convert light into an electrical signal.
A diode that emits coherent light when current passes through it.
To convert sunlight into electrical energy.
A diode that acts as a variable capacitor, used in tuning circuits.
A diode with a low forward voltage drop and fast switching speed.
The exponential diode model.
1V.
To demonstrate the behavior of a DC short to ground with an AC input signal.
0.7 V.
The voltage across the diode.
The approximation of the diode forward characteristic with two straight lines.
To limit the forward current and reverse voltage.
Ideal model, constant-voltage-drop model, and piecewise-linear model.
Two diodes.
The relationship between the input and output voltages, assuming a constant-voltage-drop model for the diodes.
Region 1.
A simple circuit used to analyze circuits in which the diode is forward conducting.
The voltage drop decreases by approximately 2 mV for every 1 °C increase in temperature.
Iterative analysis.
Approximately 1.04V.
Reverse current doubles for every 10 °C increase in temperature.
1K ohm.
V_Z = V_{Z0} + r_z I_z.
IL is the load current, and IZ is the Zener current; their difference affects the output voltage.
It can result in clipping off its two peaks.
Approximately 0.96V.
2.1 mA.
Modeling the Diode Forward Characteristic.
The specific symbol used to represent a zener diode in circuits.
Dynamic resistance.
To eliminate portions of a signal that are above or below a specified level.
The output voltage and input voltage, respectively.
n = 2
A circuit that converts alternating current (AC) to direct current (DC) using both halves of the input waveform.
V = 0.6 V
I = 1 mA, V = 0.7 V
The model for the zener diode.
The voltage across the Zener diode.
It includes the Zener voltage (VZ0) and the dynamic resistance (rz).
The diode forward characteristic.
They illustrate the relationship between input and output voltages and currents.
V T = 25 mV
5V.
The input waveform is AC, while the output waveform is a pulsating DC signal.
1.5mA.
Forward and Reverse.
It represents the diode's behavior with perfect characteristics, where v>0 indicates the forward bias and v<0 indicates the reverse bias.
A rectifier circuit.
I = 75 mA
~25.86 mV (approximately 25 mV).
v < -V_ZK and i >> I_S.
Output voltage (Vo) is 0.
Two straight lines: straight line A and straight line B.
Cut off (off) and turn on (on).
The dynamic resistance (r_D) of the diode.
A center-tapped transformer.
They represent different states of the rectifier circuit operation.
i = 10^-15(e^(0.7/0.025)-1) ≈ 1 mA.
It is the minimum current required for the Zener diode to operate in the breakdown region.
It approximates the diode's forward characteristics using a vertical straight line.
I = 1 mA
It doubles for every 5°C increase.
I = 1 A, V = 0.7 V
6.8V.
To maintain a constant output voltage despite variations in input voltage or load current.
0.7V.
Within 0.1 V over the current range of 0.1 mA to 10 mA.
Diodes can be combined with resistors to provide simple realizations of the limiter function.
The alternating current (AC) input signal.
The diode i-v characteristic with the breakdown region in detail.
I S (saturation current)
0.2 mA.
Vo equals iD multiplied by XR.
It is used to describe the behavior of diodes in terms of their voltage drop during operation.
It replaces the diode in circuit analysis to simplify calculations.
Converts alternating current (AC) to direct current (DC).
~10^-15 A.
~1 or 2, depending on the material.
Absolute temperature.
VZ = VZ0 + rz * (Iz - IL), where VZ0 is the Zener voltage at a specific current.
A battery and a resistance.
In signal-processing systems, such as limiting the voltage in op-amp circuits.
The piecewise-linear model of the diode forward characteristic and its equivalent circuit representation.
Cut off (off) and turn on (on).
The direct current (DC) output signal.
Reverse current doubles for every 10°C increase.
6.7 V.
0.88% and -1.89%.
To limit the current and provide a load for the rectified output.
I S (saturation current)
