Analog Electronics with LabVIEW®

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PB.5. BJT Output Characteristic Measurement

Components

Same circuit as in PB.4

LabVIEW Computations

SPICE I_C versus V_CE. This is performed with subVI SPICE.vi.

Straight-line curve fit from active-region data:

I_Co ≡ I_C(V_CE = 0) (active-region extrapolation)

VAF = Slope/I_Co

Procedure

Open subVI, IC_VCEsub.vi. This VI will send out a value of VBB and sweeps VCC to sweep VCE. The maximum VCE is set for 4 V. Set the value of the resistors. Run and re-run while setting VBB for an active-region collector current of about 0.5 mA. Note that at this ...

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