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Instructions: Choose the best answer for each question.
1. What is the defining characteristic of Class D amplifiers compared to traditional amplifiers? a) They use linear amplification. b) They use switching to control power delivery. c) They produce a smooth sinusoidal output waveform. d) They operate at lower frequencies.
b) They use switching to control power delivery.
2. What type of output waveform is characteristic of Class D amplifiers? a) Sine wave b) Square wave c) Triangular wave d) Sawtooth wave
b) Square wave
3. Which of the following is NOT a benefit of Class D amplification? a) High efficiency b) Compact size c) Lower production costs d) Wider bandwidth than traditional amplifiers
d) Wider bandwidth than traditional amplifiers
4. Which configuration is typically used in Class D amplifiers to optimize performance? a) Single-ended b) Push-pull c) Differential d) Bridge-tied load
b) Push-pull
5. Where are Class D amplifiers commonly found? a) Only in high-end audio systems b) In portable devices and car audio systems c) Exclusively in professional audio applications d) Only in low-power applications
b) In portable devices and car audio systems
Task: Explain the difference between the output waveforms of a traditional Class AB amplifier and a Class D amplifier. Illustrate your explanation with a simple sketch of each waveform.
A traditional Class AB amplifier produces a smooth sinusoidal waveform that closely resembles the input signal. This waveform is continuous and has a smooth, rounded shape. In contrast, a Class D amplifier produces a stepped square wave. The output waveform is essentially a series of rectangular pulses that switch between high and low states. This switching action results in a waveform with sharp transitions and a "chopped" appearance. Here are simple sketches to illustrate the difference: **Class AB Amplifier Output:** ``` ___ / \ / \ /_______\ ``` **Class D Amplifier Output:** ``` _____ _____ _____ _____ | || || || | |_____||_____||_____||_____| ```
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