Feb 15 2011, 06:12 PM
QUOTE(tunertoobe @ Feb 15 2011, 04:21 PM)
Class A amplifies the analog signal wave fully. Therefore you get no distortion. But on the downside, at best, for every unit of power you give in, that is the power you're putting out.
Class AB IIANM, only amplifies half of the analog signal wave. You get a bit of distortion but over twice the power efficiency over a Class A amp.
Actually, theres no amp that has no distortion. ALL amp introduces distortion. However, class A amp is biased higher so that it is conducting ALL the time. this means that even if there is no music playing, current still pass through the transistor/tube, hence lots of wasted power. The advantage is that there is no crossover distortion like in class AB or D. Class AB IIANM, only amplifies half of the analog signal wave. You get a bit of distortion but over twice the power efficiency over a Class A amp.
Class AB amp has a pair of complimentary transistor/tube that conduct (more than) half of the wave form from each.
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