Body composition analysis system

A body composition analysis system comprising:

• a first sinusoidal signal generator configured to convert a first digital sinusoidal signal having a first target frequency to a first analog sinusoidal signal;
• a second sinusoidal signal generator configured to convert a second digital sinusoidal signal having a second target frequency different from the first target frequency to a second analog sinusoidal signal;
• a signal mixer configured to synthesize the first and second analog sinusoidal signals and output a transmission signal;
• a first synchronous detector configured to extract a first target frequency component of the bioelectrical signal based on a multiplication operation of a bioelectrical signal generated in response to the transmission signal and a first reference signal having the first target frequency;
• a second synchronous detector configured to extract a second target frequency component of the bioelectrical signal based on a multiplication operation of the bioelectrical signal and a second reference signal having the second target frequency;
• and
• a bioimpedance analyzer configured to analyze a bioimpedance based on the extracted first and second target frequency components.