公开(公告)号：US11831314B1

公开(公告)日：2023-11-28

申请号：US17823655

申请日：2022-08-31

Applicant: Apple Inc.

Inventor： Simone del Cesta

IPC: H03L1/02 ,  G05F3/24 ,  H03K3/011 ,  H03K3/023 ,  H03K3/03

CPC classification number: H03K3/011 ,  G05F3/245 ,  H03K3/023 ,  H03K3/0315 ,  H03L1/022

Abstract: A ratiometric current source circuit having a reduced temperature dependence is disclosed. An embodiment of the current source circuit includes a first divider circuit configured to generate a reference voltage using a voltage level of a power supply node and a second divider circuit including a first resistor with a first temperature coefficient and a second resistor with a second temperature coefficient. The first resistor is configured to generate a first current using an input voltage and the voltage level of the power supply node and the second resistor is configured to generate a second current using the input voltage. The embodiment further includes a buffer circuit configured to generate the input voltage using the reference voltage and generate an output current using a difference between the first current and the second current.