Magnetic sensor circuit
US8305075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2010 |
| Grant date | Nov 6, 2012 |
| Priority date | — |
| Expiry date | Jun 14, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/072
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided is a magnetic sensor circuit of low power consumption, in which a magnetic detection level less depends on a resistance value of an internal resistor of a power source. A comparator circuit compares a voltage which is based on a magnetic field and generated after sampling under a state in which power is supplied to mainly a Hall element and an amplifier circuit to drop a power supply voltage, with a reference voltage after sampling under the same state. Both the voltages are generated based on the power supply voltage dropped by an internal resistor. Therefore, the magnetic detection level less depends on a resistance value of the internal resistor. The comparator circuit may be disabled during a sample period, and the Hall element and the amplifier circuit may be disabled during a comparison period, and hence power consumption of the magnetic sensor circuit is reduced by corresponding power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.