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Prelab a) Look over Section 2-7 of Electronic Devices by Floyd to get a basic understanding of diode limiters and clampers. b) Design a diode limiter or clipper circuit which limits input signals to +3 V and -2 V (cf. Floya, Example 2-11). This means that the output signal should not rise above 3 V and should not fall below -2 V. Also calculate the maximum current flowing through each of the diodes. Simulate your clipper in Multisim and compare the currents with your calculations. The input signal should be a sine wave with an amplitude of 5 V and frequency of 1 kHz. Use a 100 kΩ resistor and a pair of 1N4006 diodes. Run a transient simulation from 0 to 5 ms. This will show you 5 periods. Save the input and output voltage waveforms. Now change the resistance to 100 Ω and re-simulate. Report the changes that you observed along with explanations for these changes (look up the datasheet of the diode and see the plot of forward voltage vs forward current). c) Design a clamper circuit to clamp the upper limit of the input signal to 0.7 V (cf. Floyd, Example 2-13). Use a 4.7 kΩ resistor and a 1N4148 diode. Calculate the value of capacitance required (see Background below). Show your calculation. Then test your design in Multisim. Use a square wave input signal of 1.5 V amplitude and a frequency of 1 kHz. Run a transient simulation to show 10 periods of the output signal. Reduce the capacitor by a factor of 5 and repeat the simulation.

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