Lab 13 TF EIM

DC Transistor Curves

Transistor circuit

1. Identify the type of transistor you are using.
2. Construct the circuit below according to the type of transistor you have.
3. Measure the emitter current I_E for several values of V_{CE} by changing V_{CC} such that the base current $I_B = 2 \mu$ A is constant. $I_B \approx \frac{V_{bb}-V_{BE}}{R_B}$
4. Repeat the previous measurements for $I_B \approx 5 \mbox{ and } 10 \mu$ A. Remember to keep $I_CV_{CE} \lt P_{max}$ so the transistor doesn't burn out
5. Graph $I_C$ -vs- $V_{CE}$ for each value of $I_B$ and $V_{CC}$ above. (40 pnts)
6. Draw the $P_{max}$ curve on the above graph shading in the forbidden region.(10 pnts)

Questions

1. What is $h_{FE}$ or $\beta$ for the transistor? (10 pnts)
2. What is $\alpha$ 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)

Forest_Electronic_Instrumentation_and_Measurement