公开(公告)号：US11909406B1

公开(公告)日：2024-02-20

申请号：US17893471

申请日：2022-08-23

Applicant: Apple Inc.

Inventor： Ahmed I Hussein ,  Mahdi Forghani ,  David M Signoff

IPC: H03L7/099 ,  H03L7/093

CPC classification number: H03L7/0995 ,  H03L7/093

Abstract: An electronic device may include wireless circuitry having mixer circuitry configured to receive an oscillator signal from phase-locked loop circuitry. The phase-locked loop circuitry may include a digital or analog phase-locked loop having a first frequency divider, a ring oscillator, and an auxiliary phase noise cancellation loop coupled to the ring oscillator. The auxiliary phase noise cancellation loop may include at least a time-to-digital converter, a second frequency divider, an amplifier, and a bandpass filter configured to reject thermal and quantization noise associated with the time-to-digital converter. The first frequency divider may have a first division ratio, whereas the second frequency divider may have a second division ratio that is less than the first division ratio to provide faster phase noise correction.

公开(公告)号：US20240072813A1

公开(公告)日：2024-02-29

申请号：US17893471

申请日：2022-08-23

Applicant: Apple Inc.

Inventor： Ahmed I Hussein ,  Mahdi Forghani ,  David M Signoff

IPC: H03L7/099 ,  H03L7/093

CPC classification number: H03L7/0995 ,  H03L7/093

Abstract: An electronic device may include wireless circuitry having mixer circuitry configured to receive an oscillator signal from phase-locked loop circuitry. The phase-locked loop circuitry may include a digital or analog phase-locked loop having a first frequency divider, a ring oscillator, and an auxiliary phase noise cancellation loop coupled to the ring oscillator. The auxiliary phase noise cancellation loop may include at least a time-to-digital converter, a second frequency divider, an amplifier, and a bandpass filter configured to reject thermal and quantization noise associated with the time-to-digital converter. The first frequency divider may have a first division ratio, whereas the second frequency divider may have a second division ratio that is less than the first division ratio to provide faster phase noise correction.