Reducing distortion in amplified signals in well logging tools

A method of well logging, the method comprising:

• directing an excitation signal to an environment adjacent a wellbore;
• receiving a probe signal from the environment adjacent the wellbore responsive to the excitation signal;
• amplifying the probe signal to provide an amplified signal;
• spectrally analyzing the amplified signal to generate spectral information of the amplified signal;
• determining whether the amplified signal comprises distortion based on the spectral information;
• issuing a feedback signal to cause at least a reduction of the distortion in the amplified signal;
• and
• logging, by a computer system, information about the environment adjacent the wellbore based on the amplified signal.

A system, comprising:

• a receiver to amplify a probe signal received from a target, and to output an amplified signal;
• and
• a feedback module to receive the amplified signal, the feedback module comprising
• a spectrum analyzer module to perform a spectral analysis on the amplified signal to generate spectral information of the amplified signal based on the spectral analysis, and
• a controller module to determine, from the spectral information, whether the amplified signal comprises distortion, and if so, to issue a feedback signal to cause at least a reduction of the distortion.