Magnetic field sensor
US6727684B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2002 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Jul 10, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D3/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field sensor includes: a Hall element; a voltage amplifier for amplifying an output voltage from the Hall element so as to output an amplified signal; a voltage comparison circuit for receiving the amplified signal; a switch circuit provided between the voltage amplifier and the voltage comparison circuit for inverting a polarity of the amplified signal; and a latch circuit for holding an output signal from the voltage comparison circuit. The voltage comparison circuit inverts a polarity of a hysteresis voltage that determines a reference value of a magnetic field intensity in response to a first synchronizing signal, which triggers a detection of a magnetic field, and a second synchronizing signal following the first synchronizing signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.