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Unformatted text preview: Report 8: Multi-stage Ampliﬁers
Name: Lab Section: 3.1.3 Measure IBIAS and the DC output voltage, VOUT . IBIAS = vOUT = 3.1.4 Using the oscilloscope, plot both vIN and vOUT . Sketch the waveforms you observe. 3.1.5 Why is vOUT not sinusoidal? 1 2 3.1.7 Measure the peak-to-peak voltage of the output waveform (i.e. the voltage signal across RL ). What is the gain of the ampliﬁer when the resistive load is attached? vL,p−p = vL = vin 3.2.1 Can you hear anything from the speaker when it is directly connected to the function generator? Yes or No 3.2.3 Can you hear anything from the speaker when it is connected to the output of the ampliﬁer? Yes or No 3.2.4 Measure IBIAS 1 , IBIAS 2 , and the DC voltages at vOUT 1 and vOUT 2 . IBIAS 1 = IBIAS 2 = vOUT 1,DC = vOUT 2,DC = 3.2.5 Measure the VBE of Q2 . Is the DC voltage at vOUT 1 large enough to bias Q2 into forward active mode? VBE = Yes or No 3 3.2.6 Using the oscilloscope, plot both vIN and vOUT 2 . Sketch the observed waveforms. 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 ? ...
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- Spring '08
- Direct Current, Oscilloscope, DC output voltage, Measure IBIAS, 3.2.4 Measure IBIAS