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In electrical engineering, the power gain of an electrical network is the ratio of an output power to an input power. Unlike other signal gains, such as voltage and current gain, "power gain" may be ambiguous as the meaning of terms "input power" and "output power" is not always clear. Three important power gains are operating power gain ...
A gain greater than one (greater than zero dB), that is, amplification, is the defining property of an active device or circuit, while a passive circuit will have a gain of less than one. [4] 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 ...
The use of voltage gain figure is appropriate when the amplifier's input impedance is much higher than the source impedance, and the load impedance higher than the amplifier's output impedance. If two equivalent amplifiers are being compared, the amplifier with higher gain settings would be more sensitive as it would take less input signal to ...
The linear range is that range of input or output values for which an electronic amplifier produces an output signal that is a direct, linear function of the input signal. That is, the output can be represented by the equation: Output = Input × Gain. When operating in the linear range, no clipping occurs.
Responsivity is a measure of the input–output gain of a detector system. In the specific case of a photodetector, it measures the electrical output per optical input.. A photodetector's responsivity is usually expressed in units of amperes or volts per watt of incident radiant power.
The high gain of the op-amp keeps the photodiode current equal to the feedback current through R f. The input offset voltage due to the photodiode is very low in this self-biased photovoltaic mode. This permits a large gain without any large output offset voltage.
The complex gain G of this circuit is then computed by dividing output by input: G = 2 V j ⋅ 1 V = − 2 j . {\displaystyle G={\frac {2\ V}{j\cdot 1\ V}}=-2j.} This (unitless) complex number incorporates both the magnitude of the change in amplitude (as the absolute value ) and the phase change (as the argument ).
An important gain compression parameter is the OP1dB, which is the power input that results in a 1 dB compression of the output power (OP), corresponding to a gain ratio of 10-1 ⁄ 10 = 79.4%. Harmonic distortion results from nonlinear transfer curves.