公开(公告)号：US10938380B1

公开(公告)日：2021-03-02

申请号：US16707873

申请日：2019-12-09

Applicant: Apple Inc.

Inventor： Mohammadhasan Fayazi ,  Pablo Moreno Galbis ,  Stanley Bo-Ting Wang

IPC: H03K3/03

Abstract: A bias current circuit is disclosed. The bias current circuit includes a number of current sources that can selectively be coupled to a bias current node or an auxiliary node. The bias current may be provided through the bias current node. During a trimming operation, a control circuit may selectively couple particular ones of the current sources to the bias current node, in accordance with a desired bias current. Other ones of the current sources may be coupled to the auxiliary node, through which an auxiliary current is provided. Upon completing the trimming operation, the control circuit may cause the auxiliary current to be reduced to zero.