Moving object detection circuit and method thereof

A moving object detection circuit for detecting movement information of a measured object, the moving object detection circuit comprising:

• a first mixing circuit configured to mix a RF carrier signal and a first analog signal to generate a second analog signal, wherein the first analog signal is generated by a transmitted signal reflecting from the measured object;
• an analog-to-digital conversion circuit coupled to the first mixing circuit and configured to generate at least one first digital signal according to the second analog signal;
• a first mixing unit configured to mix an IF signal and a first IF carrier signal to generate a first signal, and mix the IF signal and a second IF carrier signal to generate a second signal, wherein the first IF carrier signal and the second IF carrier signal are related to an intermediate frequency, and the IF signal is related to the at least one first digital signal;
• and
• a distance detecting unit configured to generate a detection result according to the first signal and the second signal, wherein the detection result corresponds to a distance between the measured object and the moving object detection circuit;
• wherein the distance detecting unit comprises:
• a time domain to frequency domain analysis unit configured to generate at least one frequency domain signal according to the first signal and the second signal;
• and
• a spectral peak analysis unit configured to perform spectral peak selection according to the at least one frequency domain signal to generate a calculated value, wherein the calculated value is related to the detection result;
• and