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

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UNIVERSITY OF CALIFORNIA AT BERKELEYCollege of EngineeringDepartment of Electrical Engineering and Computer SciencesEE105 Lab Exp er imentsPrelab 5: Single Stage BJT Amplifiers: CommonCollector and Common BaseName:Lab Section:−+VIN−vin+RSVCC+vout−REFigure 1: Common collector amplifier1. Draw the small signal model for the common collector amplifier shown in Figure 1.2. State (do not derive) the fo rmulas for the input impedance, output impedance, and voltage gain of acommon collector amplifier.123. Using the following parameters, calculate the numerical values of the properties above: IS= 26.03 fA,RS= 10 kΩ, RE= 100 Ω, VIN= 6.350 V, and β = 270. Ignore the Early effect and make approxima-tions when appropriate.4. How do these properties compare to those of the common emitter a mplifier ?−+VBRCioutVCCiinFigure 2: Common base amplifier with a current input5. Draw the small signal model for the common base amplifier shown in Figure 2. Note: The currentsource iinis a small-signal AC current source, not a DC current source, so you must include it in thesmall-signal model.36. State (do not derive) the formulas for input impedance, output impedance, and current gain (Ai=iout/iin) of a common base amplifier.7. Using the fo llowing parameters, ca lculate the numerical value of the properties above: IS= 26.03 fA,RC= 1 kΩ, and VBE= 640 mV. Ignore the Early effect and make approximations when appropriate.8. How do these properties compare to those of the common emitter a mplifier


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

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