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Lab #15 - JaclynAucoin Summer2003 Lab#15 BJTs,FETs,...

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Jaclyn Aucoin Summer 2003 Lab #15 BJT’s, FET’s, and FET Ring Oscillators 6/26/2003 Lab Partner: Steve Smith
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1) Prepare a triangular wave signal from 0 to 5V at a frequency of 1.2kHz. 2) Connect the circuits in figures 1 through 4: Complete the design by choosing values for R1, R2, R3, and R4. We chose R1=R2=R3=10kΩ as per your advice in class. Observe the waveforms at points A, B, and C. Can you detect any current drawn by the FET? No. We cannot detect any current drawn by the FET. A very small amount of current was drawn by the scope. Compare the emitter follower in figure 1 to the source follower in figure 2. What Vt do you measure on the scope? Compare the grounded-emitter inverter in figure 3 to the grounded-source inverter in figure 4. At what input voltage does C start to decrease in voltage? In figure 3 C begins to decrease at about 0.7V while in figure 4 C begins to decrease at about 2.0V. 3) Connect the CMOS circuit in figure 5:
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