Compensating circuit for a magnetic field sensor
US4752733A · kind A · utility
Inventors
Key dates
| Filing date | Aug 12, 1985 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | Aug 12, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit which compensates for fluctuations in the transfer characteristic of a magnetic field sensor is disclosed. More particularly, an auxiliary magnetic field is generated preferably by a coil which is connected to a voltage generator by way of a voltage/current transducer. The auxiliary magnetic field along with the magnetic field to be measured is detected by the magnetic field sensor. The portion of the sensor output signal due to the auxiliary magnetic field is correlated with the voltage produced by the voltage generator by means of a correlator circuit. If the portion of the magnetic field sensor output due to the auxiliary magnetic field is not properly correlated with the signal from the voltage generator a feedback signal is sent to the magnetic field sensor to adjust the transfer characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.