Phase noise measuring device and phase noise measuring method

摘要

PROBLEM TO BE SOLVED: To reduce a hardware scale in digital phase noise measurement. SOLUTION: A phase noise measuring device has a first conversion unit that converts an oscillator signal having phase noise into a first digital signal based on a first clock, and a second digital oscillator signal based on the second clock. A second conversion unit that converts a signal, a first down-conversion that converts a first digital signal into a first baseband signal, and a second down-conversion that converts a second digital signal into a second baseband signal. A first high-speed Fourier transform unit that performs high-speed Fourier transform on the first baseband signal to generate the first signal, and a second high-speed Fourier transform unit that performs high-speed Fourier transform on the second baseband signal to generate the second signal. It is provided with an averaging unit that averages the first signal and the second signal, the frequency component of the first clock and the frequency component of the second clock match, and the phase noise component of the first clock and the phase of the second clock. It is controlled so that it does not match the noise component. [Selection diagram] Fig. 2