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homework 4 - bme 302 2010

homework 4 - bme 302 2010 - Homework 4 BME 302L Spring 2010...

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Homework 4: BME 302L, Spring 2010 Due: Tuesday March 23 Preview accepted Tuesday March 9 Problem 1 (10 points): Consider the circuit shown below. It uses a PNP transistor and the mode of bias identified as “voltage divider bias”. Three ammeters and one voltmeter are used to read the values of the transistor currents and the base voltage. 1. Calculate the base voltage V B as the voltage of the voltage divider formed by R 3 and R 4 , that is neglecting the base current of the transistor. 2. Use this value of V B to determine, V E , I E , I C , V C and I B for the circuit. 3. Build the circuit in Multisim and run the simulator. Read with the meters the three currents. Compare with the calculated values, that is determine the % relative error 100*(simulated value-calculated value)/simulated value Determine the transistor beta as I C /I B. Compare the simulated V B to the value calculated in 1. 4. Right click on the transistor. Select on the menu “Properties”, “Edit model” and change the parameter Bf from 180.7 to 300. Then select “Change part model”. Bf is the “ideal” beta parameter for the transistor which is now increased to 300. Run the simulation and compare the transistor currents for the increased Bf to those found for the original value of Bf. Which 1
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current is most changed?. Repeat the steps above and lower the value of Bf to 30. Again, run
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