1. What does pulse-width modulation mean? What does pulse-position modulation mean? Illustrate your explanation by sketching waveforms.
2. Assume that you are building a three-stage amplifier. When you test it, you discover that it is producing an output signal with no input signal. Explain how this is possible. What are some of the things you can do to eliminate the unwanted signal?
3. How does an oscillator start if there is no input signal?