Temperature-compensated current source for use in a hall analog

Details Temperature-compensated current source for use in a hall analog Temperature-compensated current source for use in a hall analog

1993-09-10

1995-02-14

Mottola, Steven

Amplifiers

With hall effect type means

330289, 327513, 327511, H03F 1500

Patent

active

053898893

ABSTRACT:
A temperature-compensated current source energizes a Hall element. The current source includes a voltage divider across the DC voltage supply busses and a differential amplifier arranged as a voltage follower which develops the output voltage across a reference resistor, creating a reference current which is amplified to generate a Hall energizing current. This results in a Hall element gain which is controllable over temperature. The temperature coefficient of the resistor can be chosen to compensate for the sensitivity temperature coefficient of a Hall element powered by a constant current source. Additionally, the temperature coefficient of the resistor may be chosen to compensate for the temperature coefficient of a magnet used to generate the magnetic field which the Hall element is intended to detect. The magnitude of the Hall current, and thus the Hall element gain, is directly proportional to the magnitude of the DC voltage supply. A trimmable current amplifier is used to compensate for the effects of manufacturing tolerances on the magnitude of the Hall current.

REFERENCES:
patent: 4465976 (1994-08-01), Avery
patent: 5260614 (1993-11-01), Theus et al.
Hall Transducer Circuit With Voltage and Current Regulation, R. J. Braun and W. S. Ebert, IBM Technical Disclosure Bulletin vol. 17 No. 11, Apr. 1975, pp. 3232-3233.

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