8/14/2023 0 Comments Transmit definition physics![]() The gain of an electronic device or circuit generally varies with the frequency of the applied signal. The "gain" of a bipolar transistor normally refers to forward current transfer ratio, either h FE ("beta", the static ratio of I c divided by I b at some operating point), or sometimes h fe (the small-signal current gain, the slope of the graph of I c against I b at a point). Furthermore, the term gain is also applied in systems such as sensors where the input and output have different units in such cases the gain units must be specified, as in "5 microvolts per photon" for the responsivity of a photosensor. In the field of audio and general purpose amplifiers, especially operational amplifiers, the term usually refers to voltage gain, but in radio frequency amplifiers it usually refers to power gain. The term gain alone is ambiguous, and can refer to the ratio of output to input voltage ( voltage gain), current ( current gain) or electric power ( power gain). A gain greater than one (greater than zero dB), that is amplification, is the defining property of an active component or circuit, while a passive circuit will have a gain of less than one. It is often expressed using the logarithmic decibel (dB) units ("dB gain"). ![]() It is usually defined as the mean ratio of the signal amplitude or power at the output port to the amplitude or power at the input port. ![]() In electronics, gain is a measure of the ability of a two-port circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output port by adding energy converted from some power supply to the signal. ![]()
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