er. In other words, describe how increases and decreases in signal duty cycle affect the amount of power delivered to the electric motor.
Explain why it is important for the final power transistor(s) in a PWM power control circuit to operate at full cutoff and full saturation, and not in the linear (active) mode in between those two extremes. What might happen if the power transistor(s) were to be less than cut-off or less than saturated when carrying load current?
If a pulse-width modulated (PWM) signal is sent to a passive integrator circuit from a circuit capable of both sourcing and sinking current (as is the case with the dual-MOSFET output stage), the output will be a DC voltage (with some ripple):
Determine the relationship between the PWM signal’s duty cycle and the DC voltage output by the integrator. What does this suggest about PWM as a means of communicating information, such as analog data from a measuring device?
Determine the frequency spectrum for a high-frequency, sine wave “carrier” signal that is amplitude-modulated (AM) by an audio-frequency sine wave signal, as the following block diagram shows:
The spectra for these respective waveforms are shown individually:
Plot the modulated signal spectrum here:
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