Lab3_Prelab - Run the simulation and check the output le...

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Prelab 3: Bipolar Junction Transistor Characterization Name: Lab Section: 1. For the NPN device shown in Figure 1, label I C , I B , and I E next to their respective current arrows. Figure 1: A simple NPN device 2. What is β in terms of I C and I B ? What is α in terms of I C and I E ? Express α in terms of β . β ( I C , I B ) = α ( I C , I E ) = α ( β ) = 3. Given that you are a circuit designer working with an NPN device and you want the device to have a g m of 1 mS, what V BE value would you need to properly bias the NPN? Assume I S is 5 × 10 - 16 A. 4. SPICE Write a SPICE netlist for the BJT test circuit shown in Figure 2. Refer to the HSPICE Tutorial if you have trouble with SPICE. Use the 2N4401 SPICE model provided on the course website. Using the .dc command, sweep V CC from 0 V to 5 V in 0 . 01 V increments and step V BB from 0 . 6 V to 0 . 7 V in 0 . 025 V increments.
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Unformatted text preview: Run the simulation and check the output le for any errors. If there are no errors, plot I CC versus V CC and print out a copy of the plot. Note: If your I CC is negative, use Awaves to plot the absolute value of I CC . I CC appears to be negative because SPICE deFnes I CC to be going out of the BJT. 1 2-+ V BB I CC-+ V CC Figure 2: Circuit to simulate in SPICE I B 1 Q 1 Q 2 I C 2 Figure 3: Darlington confguration 5. The confguration shown below in Figure 3 is known as the Darlington pair. Assume Q 1 has a DC current gain o 1 and Q 2 has a DC current gain o 2 . Derive the overall current gain, tot = I C 2 /I B 1 , as a unction o 1 and 2 . Do not neglect any currents. tot =...
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This note was uploaded on 04/06/2009 for the course ECSE 2050 taught by Professor Monahella during the Spring '08 term at Rensselaer Polytechnic Institute.

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Lab3_Prelab - Run the simulation and check the output le...

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