公开(公告)号：US12078747B2

公开(公告)日：2024-09-03

申请号：US17433323

申请日：2019-03-12

Applicant: Apple Inc.

Inventor： Igal Kushnir ,  Elan Banin ,  Rotem Banin ,  Ofir Degani ,  Ashoke Ravi

IPC: G01S7/35 ,  G01S13/58 ,  G01S13/931

CPC classification number: G01S7/35 ,  G01S13/584 ,  G01S13/931

Abstract: A method and apparatus for generating a frequency-modulated continuous wave (FMCW) signal. The apparatus may include a first oscillator configured to generate a first oscillation signal, a frequency modulator configured to generate a frequency-modulated oscillation signal from the first oscillation signal based on a sequence of control words, a frequency modulation code generator configured to generate a sequence of frequency modulation codes for generating an FMCW waveform, and a frequency multiplier configured to generate the FMCW signal by up-converting the frequency-modulated oscillation signal. The sequence of control words is generated based on the sequence of frequency modulation codes. The apparatus may include a second oscillator configured to generate a second oscillation signal, and a phase detector configured to detect a phase difference between the first oscillation signal and the second oscillation signal and generate an offset code based on the phase difference. The frequency modulator may be a digital-to-time converter.