What is distortion? Distortion is the deviation of a signal from the original signal or standard during transmission. In an ideal amplifier, the output waveform should be identical to the input waveform except for amplification, but in reality, the output and input waveforms cannot be exactly the same. This phenomenon is called distortion, also known as distortion. According to the different conditions of waveform distortion, it can be divided into three types: amplitude distortion, frequency distortion and phase distortion. The difference in the amount of signal amplification for different amplitudes is called amplitude distortion. The difference in the amount of signal amplification for different frequencies is called frequency distortion. For signals with different frequencies, the difference in time delay caused by amplification is called phase distortion (or delay distortion). Amplitude distortion is also called nonlinear distortion, and frequency distortion and phase distortion are called linear distortion.
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What is the noise figure
    The noise figure refers to the ratio of the output noise power caused by the thermal noise at the input end when the total noise power at the output of the receiver or amplifier and the internal noise-free source is under certain conditions.