Mukadimai na JFET

JFET na Nau'in Muhimmiyar

JFET shine wata transistor wanda yake kontrola kuliya da amfani da sauki.

A lokacin da muke neman JFET don wata abu, muna bukatar tushen bayanai game da zan iya. Bayanan da suke bayarwa a cikin hanyoyin ya shiga. Wadannan shine parametarin da ake amfani da su don tushen JFET, kuma sun hada da

• Sokar Sauki na Gate (VGS(off))

• Kuliya na Drain a lokacin da Gate An Yawo (IDSS)

• Transconductance (gmo)

• Rukunomi na Output na Tashin Yau (rd)

• Matsayin Kaliya (μ)

Sokar Sauki na Gate

A ciki da sauki mai yawa na drain, kuliya na drain (ID) na JFET ta gina da sauki daga gate zuwa source (VGS).

Idan sauki daga gate zuwa source yana rage da zero a ciki na JFET na n channel, kuliya na drain ta rage da kafin. Ingantaccen sauki daga gate zuwa source da kuliya na drain an samu a ciki. Ba wasu sauki daga gate zuwa source (V25155-1GS), kuliya na drain ID ta shafi zero. Wannan sauki shine Sokar Sauki na Gate (VGS(off)). Wannan sauki ya danganta da sauki mai yawa na pinch-off drain zuwa source (Vp). A ciki na JFET na p channel idan muka fi sauki na terminal na gate rage da zero, kuliya na drain ta rage da kafin, ba wasu sauki daga gate zuwa source, kuliya na drain ta shafi zero. Wannan sauki shine sokar sauki na gate don JFET na p channel. Shine sokar sauki na gate don JFET na p channel.

Kuliya na Drain a Lokacin da Gate An Yawo

Idan terminal na gate an yawo (VGS = 0) da kuma sauki daga drain zuwa source (VDS) yana rage da kafin a ciki na JFET na n channel, kuliya na drain ta rage da kafin. Ba wasu sauki mai yawa (Vp), kuliya na drain ta shafi sabon yadda, ta shafi inganci. Wannan kuliya mafi yawa, shine Kuliya na Drain a Lokacin da Gate An Yawo (IDSS), wanda ya shafi daidai don har da JFET.

Transconductance

Transconductance shine daraja daga ingantaccen kuliya na drain (δID) zuwa ingantaccen sauki daga gate zuwa source (δVGS) a lokacin da sauki daga drain zuwa source (VDS = Constant).

Wannan irin ya shafi mafi yawa a V25155-7GS = 0.

Wannan an sanya da gmo. Wannan irin mafi yawa (gmo) an bayyana a cikin hanyoyin JFET. Transconductance a ciki na irin baya na sauki daga gate zuwa source (gm) zai iya tabbatarwa haka. Ingantaccen kuliya na drain (ID) shine

Ta hanyar koyar da tsari na kuliya na drain (I25155-1D) zuwa sauki daga gate zuwa source (VGS)

A VGS = 0, transconductance ta shafi irin mafi yawa, wanda ya shafi

Saboda haka, za mu iya rubuta

Rukunomi na Output na Tashin Yau

Wannan shine daraja daga ingantaccen sauki daga drain zuwa source (δVDS) zuwa ingantaccen kuliya na drain (δID) a lokacin da sauki daga gate zuwa source (VGS = Constant). Darajin ya sanya da rd.

Matsayin Kaliya

Matsayin kaliya shine daraja daga ingantaccen sauki daga drain (δVDS) zuwa ingantaccen sauki daga gate (δVGS) a lokacin da kuliya na drain (ID = Constant). Akwai nau'i a cikin transconductance (g25155-8m) da rukunomi na output na tashin yau (rd) da za a iya tabbatar da shi haka.