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Differential amplifier
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==== Differential output ==== [[File:Differential amplifier long-tailed pair.svg|thumb|right|Figure 2: A classic long-tailed pair]] With two inputs and two outputs, this forms a differential amplifier stage (Figure 2). The two bases (or grids or gates) are inputs which are differentially amplified (subtracted and multiplied) by the transistor pair; they can be fed with a differential (balanced) input signal, or one input could be grounded to form a [[phase splitter]] circuit. An amplifier with differential output can drive a floating load or another stage with differential input.
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