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Ticket No1
1)The characteristic is called output characteristic or volt-ampere
charateristic of a Rectifier Diode .
2)Rectifier Diode .
3)A
is called Anode and C is called Cathode. An Anode has positive potential and therefore collects electrons in the device . Cathode has negative potential and therefore emits electrons to anode. The symbol looks like an arrow that ponts from the anode to the cathode, and
reminds that conventional current flows easily from the p side(anode)
to the n side(cathode).
BIASING.
Forward biasing. If the current in a diode is too large, excessive heat will destroy the device. Even approaching the burnout current value without reaching it can shorten its life. Therefore manufacturer’s
data sheet specifies the maximum forward current, that diode can
withstand. This average current IF is the rate a diode can handle up to the forward direction when used as a rectifier. Another entry of interest in the data sheet is the forward voltade drop UF(max) when the maximum forward current occurs. An usual
diode has this value 0.7-2.0V. Diode conducts easily when forward biased .
Reverse biasing. The reverse current is a leakage current at the source
rated voltage . Typically, silicon diodes have 1-10 microA and
germanium 200-700 microA of leakage current. This value includes
thermally produced current and surface leakage current. Only these currents take place , when a diode is reverse biased. At breakdown,
the diode goes into avalanche where a number of carriers appear
suddenly in the depletion layer . With a rectifier diode, breakdown is usually destructive.
4) Typical values : Uknee- approximatly 0.7V; UF –
0.7-2.0V; leakage (IR) – 1-10 microA/200-700microA.
5)Idealized
characteristic. In view of a very small leakage current in the
reverse- bias state and a small voltage drop in the forward-bias state
as compared to the operating voltages and currents of a circuit in
which the diode is used, the oputput characteristic of the diode can
be idealized as shown in the figure . This corner can be used for
analyzing the circuit topology, but should not be used for actual
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Kommentaarid (2)

kaisa40 profiilipilt
kaisa40: Suureks abiks. Tänud
14:36 02-04-2009
krebane profiilipilt
krebane: Väga hea materjal
10:25 25-03-2011



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