Double-channel digital phase noise detection device and phase noise detection method

The invention relates to a double-channel digital phase noise detection device and a phase noise detection method. An input sinusoidal signal from 1 to 100MHz is subjected to work distribution and phase shift, then double-channel quadrature sampling and digital signal processing technologies are utilized to extract phase noise in real time, so that the problem that the Fourier frequency is required to be corrected and calibrated and subjected to other testing links in the traditional measurement method is solved, an orthogonal reference source with the same frequency as a source to be tested is not required, and through utilizing a fixed reference source, the phase difference between the source to be tested and the reference source can be accurately measured in real time.