公开(公告)号：US20230101044A1

公开(公告)日：2023-03-30

申请号：US17485125

申请日：2021-09-24

Applicant: Apple Inc.

Inventor： Craig P. Finlinson ,  Weibiao Zhang ,  Tao Zeng

IPC: G01K7/21

Abstract: Various techniques for implementing resistive temperature sensors that rely on the resistors' temperature sensitivity to provide temperature sensing are disclosed. Temperature sensitive resistors may be implemented in a resistor stack in combination with a resistor stack of resistors that are relatively temperature indifferent. Various temperature sensor circuits implementing these temperature sensitive resistors are also disclosed. A temperature sensor circuit may implement the temperature sensitive resistors along with the resistors that are relatively stable with temperature to output a voltage signal that is indicative of the temperature sensed by the circuit. In some instances, the signal from the temperature sensitive resistors is increased through the use of a feedback resistor loop.

公开(公告)号：US12098964B2

公开(公告)日：2024-09-24

申请号：US17485125

申请日：2021-09-24

Applicant: Apple Inc.

Inventor： Craig P. Finlinson ,  Weibiao Zhang ,  Tao Zeng

IPC: G01K7/21 ,  G01K15/00

CPC classification number: G01K7/21 ,  G01K15/005

Abstract: Various techniques for implementing resistive temperature sensors that rely on the resistors' temperature sensitivity to provide temperature sensing are disclosed. Temperature sensitive resistors may be implemented in a resistor stack in combination with a resistor stack of resistors that are relatively temperature indifferent. Various temperature sensor circuits implementing these temperature sensitive resistors are also disclosed. A temperature sensor circuit may implement the temperature sensitive resistors along with the resistors that are relatively stable with temperature to output a voltage signal that is indicative of the temperature sensed by the circuit. In some instances, the signal from the temperature sensitive resistors is increased through the use of a feedback resistor loop.

公开(公告)号：US20250012639A1

公开(公告)日：2025-01-09

申请号：US18808877

申请日：2024-08-19

Applicant: Apple Inc.

Inventor： Craig P. Finlinson ,  Weibiao Zhang ,  Tao Zeng

IPC: G01K7/21 ,  G01K15/00

Abstract: Various techniques for implementing resistive temperature sensors that rely on the resistors' temperature sensitivity to provide temperature sensing are disclosed. Temperature sensitive resistors may be implemented in a resistor stack in combination with a resistor stack of resistors that are relatively temperature indifferent. Various temperature sensor circuits implementing these temperature sensitive resistors are also disclosed. A temperature sensor circuit may implement the temperature sensitive resistors along with the resistors that are relatively stable with temperature to output a voltage signal that is indicative of the temperature sensed by the circuit. In some instances, the signal from the temperature sensitive resistors is increased through the use of a feedback resistor loop.

公开(公告)号：US11431324B1

公开(公告)日：2022-08-30

申请号：US17412215

申请日：2021-08-25

Applicant: Apple Inc.

Inventor： Craig P. Finlinson ,  Mazen S. Soliman

IPC: G05F1/56 ,  H03K3/011

Abstract: A bandgap circuit is disclosed. The bandgap circuit includes a current source configured to generate, using a bias voltage, a first current and a second current, a first bipolar device configured to sink the first current, and a second bipolar device configured to sink the second current via a bias resistor. The bandgap circuit further includes an amplifier circuit configured to generate the bias voltage using a first voltage drop across the first bipolar device and a second voltage drop across the series combination of the bias resistor and the second bipolar device. A compensation circuit is also included, where the compensation circuit is configured to adjust, based on a value of the bias resistor, a base current of the second bipolar device.