Cikakken BJT

Takaitaccen BJT

Bipolar Junction Transistor (BJT) yana nufin kayayyakin daɗi mai tsohuwa da kuma hanyar zama.

Tushen Bipolar Junction Transistor

Akwai abubuwa biyu na tushen bipolar junction transistor, wadanda su ne hanyar zama da kuma hanyar tsohuwa.

Transistor a Tushen Tsohuwa

A tushen tsohuwa, transistor ya yi a tsakanin yanayin gudummawa ko yanayin cikin gari. A yanayin cikin gari, transistor ya yi waɗannan a kan tsohuwar da ba ta fi girma, amma a gudummawa, yana yi waɗannan a kan tsohuwar da ya fi girma.

Tsohuwar Da Ba Ta Fi Girma

A yanayin cikin gari (duku biyu suna cikin gari) karamin karamin CE yana kasance mafi girma. Kirkiyar sarki yana kasance zero saboda haka duka shirye-shirye base da collector suna kasance zero, saboda haka zarura da BJT yake kasance mafi girma (ideally infinite).

Tsohuwar Da Ya Fi Girma

A gudummawa (duku biyu suna gudummawa), an samun kirkiyar sarki mafi girma zuwa base, wanda ya sa shirye-shirye base mafi girma zuwa. Wannan ya haɗa da girmamintar karamin karamin collector-emitter junction (0.05 zuwa 0.2 V) da kuma shirye-shirye collector mafi girma. Girmaminta mai furta yana ba BJT da waɗannan a kan tsohuwar da ya fi girma.

BJT a Tushen Zama

Single Stage RC Coupled CE Amplifier

Rukunin ya nuna single stage CE amplifier. C1 da C3 suna cikin coupling capacitors, suna amfani a hankali da dukkirancin DC component da kuma passing only ac part, suna tabbatar da cewa DC basing conditions of the BJT remains unchanged even after input is applied. C2 ita ce bypass capacitor wanda ya zama voltage gain da kuma bypasses R4 resistor for AC signals.

BJT an bias a active region using the necessary biasing components. Q point an jin stable a active region of the transistor. Idan an samun input kamar yadda aka bayar, shirye-shirye base ya faru zuwa zuwa, saboda haka shirye-shirye collector ya faru kamar I C = β × IB. Saboda haka karamin karamin R3 ya faru kamar shirye-shirye collector ya tafara har zuwa. Karamin karamin R3 ita ce amplified one da kuma 180o apart from the input signal. Saboda haka karamin karamin R3 an tafiya zuwa load da zama amplification has taken place. Idan Q point an daidai a 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.

Don zama gain mafi girma, ana amfani da multistage amplifiers. Suna tafiya zuwa via capacitor, electrical transformer, R-L or directly coupled depending on the application. Gain overall ita ce product of gains of individual stages. Rukunin tafiya ya nuna a two stage CE amplifier.