A curve tracer holds the base current fixed at and sweeps the collector-emitter voltage

PHYSICS · Multi-part · Fermi University Physics · Electronics, Instrumentation & Communication · Semiconductor devices and analogue circuits · Semiconductor devices and analogue circuits

Electronics for Measurement, Ch Transistors: a current controlled by a third terminal

Problem

A curve tracer holds the base current fixed at

I_B = 25\,\mathrm{\mu A}

and sweeps the collector-emitter voltage, recording the collector current. The measured pairs of

V_{CE}

and

I_C

are:

0.05\,\mathrm{V}

and

0.90\,\mathrm{mA}

;

0.15\,\mathrm{V}

and

2.60\,\mathrm{mA}

;

0.30\,\mathrm{V}

and

3.55\,\mathrm{mA}

;

1.0\,\mathrm{V}

and

3.62\,\mathrm{mA}

;

4.0\,\mathrm{V}

and

3.65\,\mathrm{mA}

;

8.0\,\mathrm{V}

and

3.66\,\mathrm{mA}

. ((a)) State which region of operation the

V_{CE} = 0.15\,\mathrm{V}

point lies in, and which region the

V_{CE} = 4.0\,\mathrm{V}

point lies in, giving the reasoning. ((b)) Read

\beta_F

off the active-region data, using the point at

V_{CE} = 4.0\,\mathrm{V}

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