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11 sedr42021_0513a.jpg Figure Circuit symbols for BJTs.

12 sedr42021_0514a.jpg Figure Voltage polarities and current flow in transistors biased in the active mode.

13 Conceptual circuit for measuring the
iC –vCE characteristics of the BJT. sedr42021_p03003a.jpg The iC –vCE characteristics of a practical BJT.

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15 Conceptual circuit to illustrate the operation of the transistor as an amplifier.
sedr42021_p03003a.jpg The circuit a) of with the signal source vbe eliminated for dc (bias) analysis.

16 Linear operation of the BJT transistor under the small-signal condition

17 Basic BJT digital logic inverter.

18 Sketch of the voltage transfer characteristic of the inverter circuit

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