APPARATUS FOR DETECTING MICRO SIGNAL

摘要

PURPOSE: An apparatus for detecting a micro signal is provided to improve the detection sensitivity of a micro signal by using the signal having a high SNR when detecting a detection target signal of a target frequency band from an input signal. CONSTITUTION: A reference signal generating unit(110) generates and outputs a reference signal having a frequency identical to the frequency of a detection target signal included in an input signal. A frequency mixing unit(120) generates a synthesized signal by multiplying the input signal with the reference signal, and a filtering unit(130) extracts a signal corresponding to the second harmonic wave component for the frequency of the detection target signal from the synthesized signal. A signal detection unit(140) detects the detection target signal from the signal outputted from the filtering unit.