公开(公告)号：US12270714B2

公开(公告)日：2025-04-08

申请号：US17657057

申请日：2022-03-29

Applicant: Apple Inc.

Inventor： Matthias Eberlein

IPC: G01K7/00 ,  G01K7/01 ,  G01R19/10 ,  G01R19/165

Abstract: A temperature sensor circuit is disclosed that uses multiple bipolar devices to generate a proportional to absolute temperature (PTAT) current and a complementary to absolute temperature (CTAT) current. A difference in the PTAT and CTAT current is evaluated using a feedback loop of an amplifier circuit which alternatively charges and discharges a capacitor to create a time-varying analog signal. A comparator circuit compares the analog signal to threshold values to generate an output digital signal whose duty cycle varies with temperature.

公开(公告)号：US20240427360A1

公开(公告)日：2024-12-26

申请号：US18340737

申请日：2023-06-23

Applicant: Apple Inc.

Inventor： Matthias Eberlein

IPC: G05F1/46 ,  G05F1/575 ,  G05F1/59

Abstract: A voltage reference circuit included in a computer system includes an asymmetric differential amplifier circuit that includes two metal-oxide semiconductor (MOS) transistors with different threshold voltages and different current densities. The voltage reference circuit also includes a driver circuit that generates, using a control signal, an output current that is used by a divider circuit to generate a reference voltage and a feedback voltage. The reference voltage and the feedback voltage are used by the asymmetric differential amplifier circuit to generate the control signal.

公开(公告)号：US20220316956A1

公开(公告)日：2022-10-06

申请号：US17657057

申请日：2022-03-29

Applicant: Apple Inc.

Inventor： Matthias Eberlein

IPC: G01K7/00 ,  G01R19/10 ,  G01R19/165

Abstract: A temperature sensor circuit is disclosed that uses multiple bipolar devices to generate a proportional to absolute temperature (PTAT) current and a complementary to absolute temperature (CTAT) current. A difference in the PTAT and CTAT current is evaluated using a feedback loop of an amplifier circuit which alternatively charges and discharges a capacitor to create a time-varying analog signal. A comparator circuit compares the analog signal to threshold values to generate an output digital signal whose duty cycle varies with temperature.

公开(公告)号：US11983026B2

公开(公告)日：2024-05-14

申请号：US17655152

申请日：2022-03-16

Applicant: Apple Inc.

Inventor： Matthias Eberlein

IPC: G05F3/30 ,  G05F1/56

CPC classification number: G05F1/56 ,  G05F3/30

Abstract: A voltage reference circuit included in a computer system includes two bipolar devices with two different current densities which are used to generate two base-emitter voltages, which are scaled using divider circuits. The voltage reference circuit also includes a feedback circuit that generates a reference voltage using the scaled base-emitter voltages and a feedback signal. The feedback signal is generated using the reference signal and combined with one of the scaled base-emitter voltages to compensate for variations in load current from the reference circuit.

公开(公告)号：US20230297127A1

公开(公告)日：2023-09-21

申请号：US17655152

申请日：2022-03-16

Applicant: Apple Inc.

Inventor： Matthias Eberlein

IPC: G05F1/56

CPC classification number: G05F1/56

Abstract: A voltage reference circuit included in a computer system includes two bipolar devices with two different current densities which are used to generate two base-emitter voltages, which are scaled using divider circuits. The voltage reference circuit also includes a feedback circuit that generates a reference voltage using the scaled base-emitter voltages and a feedback signal. The feedback signal is generated using the reference signal and combined with one of the scaled base-emitter voltages to compensate for variations in load current from the reference circuit.