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.

公开(公告)号：US20250096735A1

公开(公告)日：2025-03-20

申请号：US18663467

申请日：2024-05-14

Applicant: Apple Inc.

Inventor： Yahia Z Ibrahim ,  Preeti S Mulage ,  David M Signoff

IPC: H03F1/02 ,  H03F3/24

Abstract: Amplifier circuitry is provided that includes a splitter circuit, a combiner circuit, a first amplifier path coupled between the splitter circuit and the combiner circuit, and a second amplifier path coupled between the splitter circuit and the combiner circuit. The first amplifier path can include a first amplifier of a first type and a second amplifier of a second type different than the first type. The second amplifier path can include a third amplifier of the first type and a fourth amplifier of the second type. The first, second, third, and fourth amplifiers can be single-ended amplifiers with shunt inductors coupled at their outputs. The shunt inductors associated with the first and second amplifiers can be partially overlapped to save area. The shunt inductors associated with the third and fourth amplifiers can be partially overlapped to save area.

公开(公告)号：US20230412135A1

公开(公告)日：2023-12-21

申请号：US17843507

申请日：2022-06-17

Applicant: Apple Inc.

Inventor： Kefei Wu ,  Morteza Nick ,  David M Signoff ,  Preeti S Mulage

IPC: H03G3/30 ,  H03F3/72 ,  H04B1/00

CPC classification number: H03G3/3026 ,  H03F3/72 ,  H04B1/0053 ,  H03F2200/24 ,  H03G2201/103

Abstract: This disclosure is directed to reducing output voltage distortions of Variable Gain Amplifiers (VGAs). A VGA may include a number of amplifiers each providing a portion of a total gain of the VGA. For example, a processing circuit may select one or more of the amplifiers of the VGA to provide the output signal with a selected gain. However, the selected amplifiers may provide amplified signals with one or more distortion signals when receiving a bias voltage. Systems and methods are described to reduce or cancel the distortion signals of the selected amplifiers by providing a subthreshold nonzero bias voltage (e.g., a weak voltage) to the remaining (e.g., non-selected) amplifiers of the VGA. For example, the non-selected amplifiers may receive the weak voltage to provide distortion signals with similar voltage amplitude and out of phase compared to the distortion signals of the selected amplifiers.