Amplifier parameter description Amplifier parameter description Amplifier parameter description Operating frequency range (F): refers to the operating frequency range in which the amplifier meets the indicators at all levels. The actual operating frequency range of the amplifier may be larger than the defined operating frequency range. Power gain (G): refers to the ratio of the amplifier output power to the input power, and the unit is usually \"dB\". Gain flatness (ΔG): refers to the range of amplifier gain variation within the entire operating frequency range at a certain temperature. Gain flatness is expressed by the following formula (see Figure 1) Figure 1 ΔG=±(Gmax-Gmin)/2dB ΔG: Gain flatness Gmax: Maximum amplitude of the gain-frequency sweep curve Gmin: Minimum amplitude of the gain-frequency sweep curve Noise figure (NF): The noise figure refers to the ratio of the signal-to-noise ratio at the input end to the signal-to-noise ratio at the output end of the amplifier, and the unit is usually \"dB\". The noise figure is expressed by the following formula: NF=10lg(input signal-to-noise ratio/output signal-to-noise ratio) When the noise figure of the amplifier is relatively low (for example, NF
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