P-n Junction Diode
1 CHARACTERISTICS AND OTHER DIODE APPLICATIONS
AIM:-To observe and draw the Forward and Reverse bias V-I Characteristics of a P-N
Junction diode and diode applications .
APPARATUS:P-N Diode 1N914
Regulated Power supply (0-30v)
Resistor 1KΩ
Ammeters (0-200 mA,
Voltmeter (0-2V/200 V)
Bread board
Connecting wires
THEORY:A p-n junction diode conducts only in one direction. The V-I characteristics of the diode are curve between voltage across the diode and current through the diode. When external voltage is zero, circuit is open and the potential barrier does not allow the current to flow. Therefore, the circuit current is zero. When Ptype (Anode is connected to +ve terminal and n- type (cathode) is connected to –ve terminal of the supply voltage, is known as forward bias. The potential barrier is reduced when diode is in the forward biased condition. At some forward voltage, the potential barrier altogether eliminated and current starts flowing through the diode and also in
the circuit. The diode is said to be in ON state. The current increases with increasing forward voltage.
When N-type (cathode) is connected to +ve terminal and P-type
(Anode) is connected
–ve terminal of the supply voltage is known as reverse bias and
the potential barrier across the junction increases. Therefore, the junction resistance becomes very high and a very small current (reverse saturation current) flows in the circuit. The diode is said to be in OFF state. The reverse bias current due to minority charge carriers.
1
CIRCUIT DIAGRAM:FORWARD BIAS:-
Fig.1 (a) Forward Bias Diode
REVERSE BIAS:-
Fig.1 (b) Reverse Bias Diode
MODEL WAVEFORM:-
2
PROCEDURE:FORWARD BIAS:1. Connections are made as per the circuit diagram.
2. For forward bias, the RPS +ve is connected to the anode of the diode and
RPS –ve
is connected to the cathode of the diode,
3. Switch on the power supply and increases the input voltage (supply voltage) in
Steps.
AIM:-To observe and draw the Forward and Reverse bias V-I Characteristics of a P-N
Junction diode and diode applications .
APPARATUS:P-N Diode 1N914
Regulated Power supply (0-30v)
Resistor 1KΩ
Ammeters (0-200 mA,
Voltmeter (0-2V/200 V)
Bread board
Connecting wires
THEORY:A p-n junction diode conducts only in one direction. The V-I characteristics of the diode are curve between voltage across the diode and current through the diode. When external voltage is zero, circuit is open and the potential barrier does not allow the current to flow. Therefore, the circuit current is zero. When Ptype (Anode is connected to +ve terminal and n- type (cathode) is connected to –ve terminal of the supply voltage, is known as forward bias. The potential barrier is reduced when diode is in the forward biased condition. At some forward voltage, the potential barrier altogether eliminated and current starts flowing through the diode and also in
the circuit. The diode is said to be in ON state. The current increases with increasing forward voltage.
When N-type (cathode) is connected to +ve terminal and P-type
(Anode) is connected
–ve terminal of the supply voltage is known as reverse bias and
the potential barrier across the junction increases. Therefore, the junction resistance becomes very high and a very small current (reverse saturation current) flows in the circuit. The diode is said to be in OFF state. The reverse bias current due to minority charge carriers.
1
CIRCUIT DIAGRAM:FORWARD BIAS:-
Fig.1 (a) Forward Bias Diode
REVERSE BIAS:-
Fig.1 (b) Reverse Bias Diode
MODEL WAVEFORM:-
2
PROCEDURE:FORWARD BIAS:1. Connections are made as per the circuit diagram.
2. For forward bias, the RPS +ve is connected to the anode of the diode and
RPS –ve
is connected to the cathode of the diode,
3. Switch on the power supply and increases the input voltage (supply voltage) in
Steps.