Lab 13 RS

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DC Bipolar Transistor Curves

Data sheet for transistors.

Media:2N3904.pdfMedia:2N3906.pdf

2N3904 PinOuts.png2N3906 PinOuts.png


Using 2N3904 is more srtaight forward in this lab.

Transistor circuit

1.) Identify the type (n-p-n or p-n-p) of transistor you are using and fill in the following specifications.


Value Description
Collector-Base breakdown voltage
Emitter-Base Breakdown Voltage
Maximum Collector Voltage
Maximum Collector Current
Transistor Power rating(PMax)
DC current gain hFE(IC,VCE)


2.) Construct the circuit below according to the type of transistor you have.

TF EIM Lab13a Circuit.pngTF EIM Lab13 Circuit.png


Let RE=100Ω.

VCC<5Volts variable power supply

VBE=1V.

Find the resistors you need to have

IB=2μA , 5μA , and 10μA

3.) Measure the emitter current IE for several values of VCE by changing VCC such that the base current IB=2μ A is constant. IBVBBVBERB


V_{CC} V_B V_{BB} V_ {EC} V_ E R_E R_B I_E I_B
mV mV V mV mV Ω kΩ mA \muA


4.) Repeat the previous measurements for IB5 and 10μ A. Remember to keep ICVCE<Pmax so the transistor doesn't burn out

V_{CC} V_B V_{BB} V_ {EC} V_ E R_E R_B I_E I_B
mV mV V mV mV Ω kΩ mA \muA


5.) Graph IC -vs- VCE for each value of IB and VCC above. (40 pnts)

6.) Overlay points from the transistor's data sheet on the graph in part 5.).(10 pnts)

Questions

  1. Compare your measured value of hFE or β for the transistor to the spec sheet? (10 pnts)
  2. What is α for the transistor?(10 pnts)
  3. The base must always be more _________(________) than the emitter for a npn (pnp)transistor to conduct I_C.(10 pnts)
  4. For a transistor to conduct I_C the base-emitter junction must be ___________ biased.(10 pnts)
  5. For a transistor to conduct I_C the collector-base junction must be ___________ biased.(10 pnts)

Extra credit

Measure the Base-Emmiter breakdown voltage. (10 pnts)


I expect to see a graph (IBvsVBE) and a linear fit which is similar to the forward biased diode curves. Compare your result to what is reported in the data sheet.



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