公开(公告)号：US20230403014A1

公开(公告)日：2023-12-14

申请号：US18447221

申请日：2023-08-09

Applicant: Apple Inc.

Inventor： Reetika K. Agarwal ,  Abbas Komijani ,  Hongrui Wang

IPC: H03L7/089 ,  H03C3/09 ,  H03L7/099 ,  H04L7/033 ,  H03L7/185 ,  H03L7/197 ,  H03L7/091

CPC classification number: H03L7/0891 ,  H03C3/0941 ,  H03L7/099 ,  H04L7/033 ,  H03L7/185 ,  H03L7/1976 ,  H03L7/091

Abstract: An electronic device may include wireless circuitry having mixer circuitry configured to receive oscillator signals from a partial-fractional phase-locked loop (PLL). The partial-fractional PLL may include a phase frequency detector, a charge pump, a loop filter, and a frequency divider connected in a loop. To implement the partial-fractional capability of the PLL, the frequency divider may receive a bitstream from a first order sigma delta modulator and a finite impulse response filter. The first order sigma delta modulator may output a periodic non-randomized output. The finite impulse response filter may increase the frequency of toggling of the periodic non-randomized output. Configured and operated in this way, the partial-fractional PLL can exhibit reduced phase noise.

公开(公告)号：US20250030144A1

公开(公告)日：2025-01-23

申请号：US18356964

申请日：2023-07-21

Applicant: Apple Inc.

Inventor： Tarek Khedr Abdalla Mealy ,  Abbas Komijani ,  Zhengan Yang ,  Reetika K. Agarwal ,  Hongrui Wang ,  Zhang Jin

IPC: H01P5/16 ,  H01Q23/00

Abstract: This disclosure is directed to a power combiner/divider with improved operating frequency range (e.g., bandwidth) compared to other power combiners/dividers. The power combiner/divider may include an isolation circuit including a first resonant circuit and a second resonant circuit coupled to terminals (e.g., input terminals, output terminals) of the power combiner/divider. The first resonant circuit may attenuate signals having frequencies in a first frequency range below an attenuation threshold between the terminals of the power combiner/divider. The second resonant circuit may attenuate signals having frequencies in a second frequency range below an attenuation threshold between the terminals of the power combiner/divider. Accordingly, the isolation circuit may improve isolation between multiple terminals of the power combiner/divider at a wider bandwidth compared to other power combiners/dividers based attenuating cross-talk between the terminal at the first frequency range and the second frequency range.