Bias na Yanki PN

Makaranta na PN Junction Diode

PN junction diode ita ce wasu mai kawo da yake iya taka wadanda a cikin hagu da take (forward bias) kuma ya rage wadanda a cikin hagu da take rage (reverse bias).

Forward Bias

A cikin forward bias, zanen p-type ta a lura kan terminali mai karfi kuma zanen n-type ta a lura kan terminali mai rage, wanda yake iya rage layer mai rashin da take rage (depletion layer) kuma iya taka wadanda.

Reverse Bias

A cikin reverse bias, zanen p-type ta a lura kan terminali mai rage kuma zanen n-type ta a lura kan terminali mai karfi, wanda yake iya sa layer mai rashin da take rage (depletion layer) kuma iya rage wadanda.

Yadda Wadanda Ta Gida

A cikin forward bias, wadanda ta iya gida da kyau idan layer mai rashin da take rage ta rage. A cikin reverse bias, kawai wadanda mai tsarki ta gida saboda carriers mai tsarki.

Tsari Mai Tsarki

Voltage mai tsarki mai yawa ya iya sadarwa a cikin breakdowns (Zener ko Avalanche), wanda yake iya sadarwa da sharhi da take rage a wadanda, wanda yana da muhimmanci a fahimtar tsari mai gudummawa na diode.

V-I Characteristics of A PN Junction

A cikin forward bias, tsarin gida ita ce a cikin quadrant na farko. Voltage mai takaminta a kan Germanium ita ce 0.3 V kuma a kan Silicon ita ce 0.7 V. Daga wannan voltage mai takaminta, graph ya bazu a matsayin shiga. Wannan graph ita ce don Resistance mai yawa na junction a cikin forward bias.

A cikin reverse bias, voltage ta zama mai yawa a matsayin rage a cikin p-n junction, amma ba da wadanda mai karfi, kawai leakage current mai tsarki ta gida. Amma a wani voltage mai tsarki, p-n junction ta rage a cikin gida.

Wannan ita ce saboda carriers mai tsarki. Wannan amount of voltage ita ce da ke da shi don carriers mai tsarki su rage depletion region. A cikin wannan yanayi, wadanda mai sharhi za a gida a kan wannan junction. Wannan breakdown of voltage ita ne biyu.

Avalanche Breakdown: ba graph mai sharhi, amma graph mai line mai yawa, ma'ana a cikin break down, increase mai yawa a cikin reverse voltage ya iya sadarwa da wadanda mai sharhi a kan zaman lafiya.

Zener Breakdown: Wannan breakdown ita ce mai sharhi kuma ba da bukatar increase reverse bias voltage don samun wadanda mai sharhi, saboda wadanda ta gida mai sharhi.

Resistance of p-n Junction

Dynamic Resistance of p-n Junction

Daga V-I characteristics of a p-n junction, ita ce da dace cewa graph ba linear. Forward biased p-n junction resistance ita ce rd ohm; ita ce AC resistance ko dynamic resistance. Ita ce equivalent to the slope of voltage-current of the PN junction.

Average AC Resistance of p-n Junction

Average AC resistance ita ce da ake nuna da straight line drawn linking the intersection of the minimum and maximum values of the external input voltage. Some important terms related to p-n Junction