# Lab 13 TF EIM

DC Bipolar Transistor Curves

Data sheet for transistors.

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() DC current gain

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

Let .

variable power supply

.

Find the resistors you need to have

, , and

3.) Measure the emitter current for several values of by changing such that the base current A is constant.

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

4.) Repeat the previous measurements for A. Remember to keep 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 k mA \muA

5.) Graph -vs- for each value of and 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 or for the transistor to the spec sheet? (10 pnts)
2. What is 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 and a linear fit which is similar to the forward biased diode curves. Compare your result to what is reported in the data sheet.