Invention Grant
- Patent Title: Low voltage high precision power detect circuit with enhanced power supply rejection ratio
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Application No.: US17181950Application Date: 2021-02-22
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Publication No.: US11841726B2Publication Date: 2023-12-12
- Inventor: Seyedeh Sedigheh Hashemi , Vahid Majidzadeh Bafar , Ali Mesgarani , Mansour Keramat
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Kowert, Hood, Munyon, Rankin & Goetzel, P.C.
- Agent Erik A. Heter; Dean M. Munyon
- Main IPC: G05F3/26
- IPC: G05F3/26 ; G05F3/20 ; G11C5/14 ; G11C11/4074

Abstract:
A power detect circuit is disclosed. A power detect circuit includes a voltage multiplier that receives an external supply voltage and generates a second supply voltage that is greater than the former. A voltage regulator is coupled to receive the second supply voltage and outputs a regulated supply voltage. A bandgap circuit is coupled to receive the second supply voltage when a first switch is closed, and the regulated supply voltage when a second switch is closed. The bandgap circuit generates a reference voltage for the voltage regulator, as well as one or more output voltages. A comparator circuit is coupled to receive the one or more output voltages from the bandgap circuit, and may compare these one or more output voltages to the regulated supply voltage.
Public/Granted literature
- US20210247793A1 Low Voltage High Precision Power Detect Circuit with Enhanced Power Supply Rejection Ratio Public/Granted day:2021-08-12
Information query
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