Berkeley ELENG 105 - Report 8 Multi-stage Amplifiers (3 pages)

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Report 8 Multi-stage Amplifiers



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Report 8 Multi-stage Amplifiers

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Pages:
3
School:
University of California, Berkeley
Course:
Eleng 105 - Microelectronic Devices and Circuits
Microelectronic Devices and Circuits Documents

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UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences EE105 Lab Experiments Report 8 Multi stage Amplifiers Name Lab Section 3 1 3 Measure IBIAS and the DC voltage at vOUT IBIAS vOUT 3 1 4 Using the oscilloscope plot both the input vIN and the output vOUT Sketch the waveforms you observe 3 1 5 Why is vOUT not sinusoidal 3 1 7 What is the peak to peak voltage of the output waveform at vL with the load resistor What is the gain of the amplifier with the resistive load 1 2 vL p p vL vin 3 2 1 Can you hear anything when the speaker is directly hooked up to the function generator Yes or No 3 2 3 Can you hear anything when the speaker is hooked up to the output of the amplifier Yes or No 3 2 4 Measure IBIAS1 IBIAS2 and the DC voltages at vOUT 1 and vOUT 2 IBIAS1 IBIAS2 vOUT 1 DC vOUT 2 DC 3 2 5 Measure VBE of Q2 Is the DC voltage at vOUT 1 enough to bias Q2 in the forward active region VBE Yes or No 3 2 6 Using the oscilloscope plot both the input vIN and the output vOUT 2 Sketch these waveforms a plot is on the following page 3 2 7 Measure the gain vout2 vin vout2 vin 3 2 8 Now increase the DC offset of the input waveform to 620 mV What happens to the waveform at vOUT 2 3



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