Class T amplifier

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A Class T amplifier is an audio amplifier product. Rather than being a separate "class" of amplifier, Class T is a registered trademark for Tripath's amplifier technologies. It is an implementation of Class D amplifiers, but uses a sophisticated control scheme to provide very high quality audio amplification. Rather than using digital signal processing, class T amplifiers use an overall loop that is similar to a higher order Delta-Sigma (ΔΣ) (or sigma-delta) modulator. While it is called a digital amplifier, the class T amplifier is almost entirely analog; the amplifiers use a digital clock internally only to control the sampled comparator. The two key aspects of this topology is that (1) feedback is taken directly from the switching node rather than the filtered output, and (2) the higher order loop provides much higher loop gain at high audio frequencies than would be possible in a conventional single pole amplifier.

Despite superlative performance at low cost from the Class T approach, financial difficulties have caused Tripath to file for Chapter 11 bankruptcy protection on 8 February 2007.

Tripath used to sell the amplifiers as chips, or as chipsets, to be integrated into products by other companies in several countries. For example:

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