Figure 5: A Common source JFET amplifier Adjust the Volts/div and Time/div to display the waveforms on the oscilloscope screen as big as possible with one to two cycles. Sketch the input AC voltage (vin) and the load voltage (vL) waveforms on the graph. Record the Time/div and Volts/div used. Note that the input and output waveforms should be approximately 180o out of phase. From your graph, determine and which are the peak-to-peak voltages ofvL VL(pp) Vin(pp) and respectively. Calculate the voltage gain (Av) of the JFET amplifier circuit at 200 vin, kHz.Ask the instructor to check all of your results. You must show the oscilloscope waveforms to the instructor. Sweep the frequency of the function generator from 1 kHz to 550 kHz (use smaller frequency steps near the half-power point while larger steps can be used at mid-band frequencies). Record the peak-to-peak voltages of (CH1) and (CH2) and calculate vin vL the dB magnitude of the voltage gain Use both coarse and fine adjustment knobs of Av. the function generator for frequency adjustment. Plot a curve of versus frequency. Av APPENDIX A
Figure 5: A Common source JFET amplifier Adjust the Volts/div and Time/div to display the waveforms on the oscilloscope screen as big as possible with one to two cycles. Sketch the input AC voltage (vin) and the load voltage (vL) waveforms on the graph. Record the Time/div and Volts/div used. Note that the input and output waveforms should be approximately 180o out of phase. From your graph, determine VL(pp) and Vin(pp) which are the peak-to-peak voltages ofvL and vin, respectively. Calculate the voltage gain (Av) of the JFET amplifier circuit at 200 kHz.Ask the instructor to check all of your results. You must show the oscilloscope waveforms to the instructor. Sweep the frequency of the function generator from 1 kHz to 550 kHz (use smaller frequency steps near the half-power point while larger steps can be used at mid-band frequencies). Record the peak-to-peak voltages of vin (CH1) and vL (CH2) and calculate the dB magnitude of the voltage gain Av. Use both coarse and fine adjustment knobs of the function generator for frequency adjustment. Plot a curve of Av versus frequency. APPENDIX A