Lab 13 TF EIM

DC Transistor Curves

Media:2N3906.pdf

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([math]P_{Max}[/math])
	DC current gain [math]h_{FE}( I_C, V_{CE})[/math]

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

Questions

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