INSULATOR i Current i = 0 Total mobile electron charge = 0.

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Presentation transcript:

INSULATOR i Current i = 0 Total mobile electron charge = 0

CONDUCTOR i Current i = Q – / T Total mobile electron charge = Q – Transit time = T Total fixed positive charge = Q + = Q –

MOSFET DrainSource Channel idid Gate igig Gate oxide Gate current i g = dQ + /dt Gate current i g = 0 Drain current i d = 0

MOSFET DrainSource Channel idid Gate igig Gate oxide Drain current i d = Q – / T Total channel electron charge = Q – Transit time = T Total gate charge = Q + = Q – Gate current i g = 0

MOSFET DrainSource Channel idid Gate igig Gate oxide Drain current i d = Q – / T Total channel electron charge = Q – Transit time = T Total gate charge = Q + = Q – Gate current i g = dQ + /dt igig Drain current i d = 0

BJT Current i c = 0 (insulating/off state) Collector (n)Emitter (n) Base (p) icic ibib Current i b = dQ + /dt Current i b = 0 Current i b = Q + / L L = minority carrier lifetime

BJT Current i c = Q – / T Total mobile electron charge = Q – Transit time = T Total fixed positive charge = Q + = Q – Collector (n)Emitter (n) Base (p) icic ibib

BJT Current i b = dQ + / dt (< 0) Collector (n)Emitter (n) Base (p) icic ibib ibib

BJT Collector (n)Emitter (n) Base (p) icic ibib Current i b = 0 Current i c = 0