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Berkeley ELENG 105 - Report 5: Single Stage BJT Amplifiers: Common Collector and Common Base

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Lab QuestionsPost-lab QuestionsCommon Collector Amplifier as a Voltage BufferCommon Base Amplifier as a Current BufferUNIVERSITY OF CALIFORNIA AT BERKELEYCollege of EngineeringDepartment of Electrical Engineering and Computer SciencesEE105 Lab Exp er imentsReport 5: Single Stage BJT Amplifiers: CommonCollector and Common BaseName:Lab Section:1 Lab Questions3.1.2–4 CB amplifier parameters:Av=Rin=Rout=3.1.5 Suppo se the source resistance of VINis 50 Ω. Would the CB amplifier amplify a signal from this sourcewell? Why?3.2.2 DC voltage values when biased at maximum output voltage swing:VIN=VOU T=Output Voltage Swing =3.2.3 CC amplifier parameters:Av=Rin=12 POST-LAB QUESTIONS 2Rout=3.2.4 Another name for the CC amplifier is the emitter follower . Based on the gain that you have found,why do you think it has this name?3.3.3 Is the output of the common collecto r speaker a mplifier louder, quieter, or about the same as whenthe s ignal was directly applied using the function generator? Why? H int: The output impedance ofthe function generator is 50 Ω.2 Post-lab Questions2.1 Common Collector Amplifier as a Voltage Buffer1. Even though the common collector amplifier has almost unity gain, why is it still a useful amplifierconfiguration?2. What are the advantages or disadvantages of using a larger REin our common collector amplifier?2 POST-LAB QUESTIONS 32.2 Common Base Amplifier as a Current Buffer1. The CB amplifier is rarely used as a voltage or transconductance amplifier; the CE amplifier is typicallyused instead. Based on the values of the CB and CE amplifier two -p ort parameters yo u found duringthe labs, explain why this is the case.2. The CB amplifier is commonly used as a current amplifier. Approximate the current gain of a CBamplifier (Hint: What is the relationship between the emitter and collector currents of a CB amplifier? )Draw the two-port model of the CB current amplifier and find Ai.3. Suppose that a small signal current of 10 µA pea k-to-peak is applied directly to a load resistor of 5 kΩ.Assuming the source resistance is 100 Ω, what is the peak-to-peak current flowing through the loadresistor?2 POST-LAB QUESTIONS 44. Now, assume the small signal current of 10 µA peak-to-peak with source resistance of 100 Ω is appliedto the input of the CB amplifier. Assume a 5 kΩ lo ad resistor is also attached to the output of theCB amplifier. Using the two port charac teristics found during lab and the approximated current gain,what is the current flowing through the load resistor? Based on this result, why is the CB amplifierused as a current


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Berkeley ELENG 105 - Report 5: Single Stage BJT Amplifiers: Common Collector and Common Base

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