公开(公告)号：US20230350443A1

公开(公告)日：2023-11-02

申请号：US17734642

申请日：2022-05-02

Applicant: Apple Inc.

Inventor： Milad Darvishi ,  Georgios Palaskas

IPC: G05F1/56 ,  H03H7/01 ,  H04B1/04

CPC classification number: G05F1/56 ,  H03H7/0115 ,  H04B1/04

Abstract: An electronic device may include wireless circuitry having digital-to-analog converters, filters, mixers, and current buffers disposed between the filters and the mixers. The current buffers may provide proper resistance termination for the filters. The current buffers may include current mirrors formed from diode-connected n-type transistors and diode-connected p-type transistors, which collectively provide a linear input resistance. The current mirrors may receive a high voltage from a voltage regulator having a replica current mirror and proportional-to-absolute-temperature current sources.

公开(公告)号：US20250096836A1

公开(公告)日：2025-03-20

申请号：US18672960

申请日：2024-05-23

Applicant: Apple Inc.

Inventor： Nitesh Singhal ,  Mark G. Forbes ,  Abbas Komijani ,  Jong Seok Park ,  Youngchang Yoon ,  Georgios Palaskas

IPC: H04B1/40 ,  H03K17/687 ,  H03M1/66 ,  H04B17/21

Abstract: Wireless circuitry is provided that includes a radio-frequency circuit having an input transistor and bias point selection circuitry configured to determine an optimal bias voltage for the input transistor. The bias point selection circuitry may include a replica transistor, a voltage generator configured to output one or more voltage levels to a gate terminal of the replica transistor, a current-to-voltage converter coupled to a source-drain terminal of the replica transistor, an analog-to-digital converter configured to receive analog voltages from the current-to-voltage converter and to output corresponding digital codes based on the received analog voltages, and associated control circuitry configured to receive the digital codes from the analog-to-digital converter and to adjust the voltage generator to output the optimal bias voltage based on the digital codes. The optimal bias voltage produces a third order transconductance of zero for the input transistor, which results in improved linearity for the radio-frequency circuit.

公开(公告)号：US12228952B2

公开(公告)日：2025-02-18

申请号：US17734642

申请日：2022-05-02

Applicant: Apple Inc.

Inventor： Milad Darvishi ,  Georgios Palaskas

IPC: G05F1/56 ,  H03H7/01 ,  H04B1/04

Abstract: An electronic device may include wireless circuitry having digital-to-analog converters, filters, mixers, and current buffers disposed between the filters and the mixers. The current buffers may provide proper resistance termination for the filters. The current buffers may include current mirrors formed from diode-connected n-type transistors and diode-connected p-type transistors, which collectively provide a linear input resistance. The current mirrors may receive a high voltage from a voltage regulator having a replica current mirror and proportional-to-absolute-temperature current sources.