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BJT Load Line: Where the Operating Point Lives

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Common-emitter NPN amplifier — the DC load line V_CE = V_CC − I_C·R_C is fixed by the supply and the collector resistor; sweep the base current I_B and the operating point Q slides along that line through cutoff, the active region, and into saturation.

BJTNPN transistorcommon emitterload lineoperating pointcutoff
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