Bijîkên BJT

Taybetî Bipolar

Taybetî Bipolar (BJT) dihê ji bo dabeşkirina da ku amadeyek ji sê derbaran da ku bi elektronikên semikonduktor hatine bikar anîn ji bo dabeşkirina da ku amadeyek ji sê derbaran da ku bi elektronikên semikonduktor hatine bikar anîn ji bo zêdekirina da ku amadeyek ji sê derbaran da ku bi elektronikên semikonduktor hatine bikar anîn ji bo dibeşkirina da.

Karberdariya Taybetî Bipolar

Divê karberdariya taybetî bipolar vêne divêjîn, dibeka da ku amadeyek ji sê derbaran da ku bi elektronikên semikonduktor hatine bikar anîn ji bo dabeşkirina da ku amadeyek ji sê derbaran da ku bi elektronikên semikonduktor hatine bikar anîn ji bo zêdekirina da.

Transistor wek Switch

Di karberdarî dibeka de, transistor di herêmîn saturation an cutoff re xebit. Di herêm cutoff de, transistor wek switch tera xebit, di hêla saturation de, wek switch bendra xebit.

Switch Tera

Di herêm cutoff de (du junction ûn reversed biased ne), bêrga di nav CE junction de zi di hate. Bêrga input ên zero ye, ji ber vê ji bêrkên base an collector ên zero ne, li gorî vê resistance ûn BJT zi di hate (idealî infinity).

Switch Bendra

Di saturation de (du junction ûn forward biased ne), bêrga input ên bêr hatine ser base, ku hûn dikarin bêrkên base zi di hate. Ji ber vê bêrga drop ên collector-emitter junction ên qicirkir (0.05 to 0.2 V) an bêrkên collector ên mezin hatine. Bêrga drop ên qicirkir BJT wek switch bendra xebit.

BJT wek Amplifier

Single Stage RC Coupled CE Amplifier

Wêne single stage CE amplifier ên şewa dihat. C1 an C3 coupling capacitors ne, wan bikar anîn ji bo blocking DC component an passing only ac part, wan jî ensure dikin ku basing conditions ên DC ên BJT ên bêtirînin ji bo apply input. C2 bypass capacitor ne ku voltage gain ên zêdetin an R4 resistor ên bypass bikin ji bo AC signals.

BJT di active region de bi necessary biasing components hatine bia. Q point stable in the active region of the transistor. When input is applied as shown below the base current starts to vary up and down, hence collector current also varies as I C = β × IB. Therefore voltage across R3 varies as the collector current is passing through it. Voltage across R3 is the amplified one and is 180o apart from the input signal. Thus voltage across R3 is coupled to the load and amplification has taken place. If the Q point is maintained to be at the center of the load very less or no waveform distortion will take place. The voltage as well as current gain of the CE amplifier is high (gain is the factor by which the voltage of current increases from input to output). It is commonly used in radios and as low frequency voltage amplifier.

Bi tenê zêdekirina gain multistage amplifiers bikar anîn. Wan bi capacitor, electrical transformer, R-L an directly coupled connect din depending on the application. Overall gain product of gains of individual stages. Wêne two stage CE amplifier.