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Switching Amplifiers: Class D Amplifier, Class T Amplifier, Equibit

Switching Amplifiers: Class D Amplifier, Class T Amplifier, Equibit


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About the Book

Chapters: Class D Amplifier, Class T Amplifier, Equibit. Source: Wikipedia. Pages: 18. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: A Class D amplifier or switching amplifier is an electronic amplifier where all power devices (usually MOSFETs) are operated as binary switches. They are either fully on or fully off. Ideally, zero time is spent transitioning between those two states. Output stages such as those used in pulse generators are examples of class D amplifiers. However, the term mostly applies to power amplifiers intended to reproduce signals with a bandwidth well below the switching frequency. Class D amplifiers work by generating a square wave of which the low-frequency portion of the spectrum is essentially the wanted output signal, and of which the high-frequency portion serves no purpose other than to make the wave-form binary so it can be amplified by switching the power devices. A passive low-pass filter removes the unwanted high-frequency components, ie. smooths the pulses out and recovers the desired low-frequency signal. To maintain high efficiency, the filter is made with purely reactive components (inductors and capacitors), which store the excess energy until it is needed instead of converting some of it into heat. The switching frequency is typically chosen to be ten or more times the highest frequency of interest in the input signal. This eases the requirements placed on the output filter. The structure of a class D power stage is essentially identical to that of a synchronously rectified buck converter, a type of non-isolated switched-mode power supply. Whereas buck converters usually function as voltage regulators, delivering a constant DC voltage into a variable load and can only source current (one-quadrant operation), a class D amplifier delivers a constantly...More: http: //booksllc.net/?id=216680


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Product Details
  • ISBN-13: 9781158538966
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Class D Amplifier, Class T Amplifier, Equibit
  • Width: 229 mm
  • ISBN-10: 1158538960
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 1 mm
  • Weight: 45 gr


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