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.