homework 5 - bme 302 2009_1

homework 5 - bme 302 2009_1 - Homework 5 BME 302L Spring...

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Homework 5: BME 302L, Spring 2009 Due: Tuesday April 7 Preview accepted Tuesday March 31 Problem 1 (25 points): Build the circuit shown below using Multisim. It uses an NPN 2N3904 transistor biased in voltage divider bias. The input ac signal is provided with by a function generator. The output voltage at the level of load R 5 = 10 k is visualized on an oscilloscope. The amplifier is a swamped CE amplifier. 1. Perform the dc analysis of the circuit and determine the dc values for the base voltage V B, collector voltage V C , emitter voltage V E and emitter current I E . 2. Use dc probes or multimeters. Run the simulator and visualize the simulated values for the transistor voltages and currents. Include a screen shot of your simulation in your homework handout. Compare the calculated values to the simulation results, that is determine the % relative error 100*(simulated value-calculated value)/simulated value. 3. Estimate re’ using the value of the emitter current I E you calculated in question 1. 4. Perform the ac analysis of the circuit and derive the amplifier input impedance, the unloaded voltage gain, and the amplifier output impedance. 5. Disconnect the load R 5 . Run the simulation. Measure with the oscilloscope the ac input voltage V in and the ac output voltage V out . Calculate the experimental voltage gain = V out /V in . Compare to the calculated gain. 6.

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homework 5 - bme 302 2009_1 - Homework 5 BME 302L Spring...

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