G
gain In general an indication of the extent to which the amplitude of a signal is increased by its passage through an electronic system or part of it. More specifically the ratio of the output-signal power, voltage or current to the input-signal power, voltage or current. The ratio is usually expressed in decibels as
gain-bandwidth product Of an active device a figure of merit assessing its usefulness as a wideband amplifier. A given active device can give a particular value of gain over a particular value of bandwidth and if the bandwidth is changed the gain is changed in the inverse ratio so that the product remains constant. For an
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