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Hall-type transducing device
| Details |
Inventors: Van Antwerp, Joel C.;
Assignee: Xolox Corporation (Fort Wayne, IN)
Primary Examiner: Zazworsky; John
Assistant Examiner:
Attorney, Agent or Firm: Pearne, Gordon, McCoy & Granger
A transducer in the form of an integrated circuit comprising a Hall cell, first and second differential amplifiers, an output driver stage, a threshold voltage-generating circuit between said amplifiers, and a control circuit for selectively enabling and disabling the threshold voltage-generating circuit. The second amplifier provides an output signal representative of the enabled-disabled condition of the threshold voltage-generating circuit. A permanent magnet having a temperature coefficient is movable with respect to the transducer between given field-applying and field-removing positions. The transducer operates to change switching states between "operate" and "release" in response to the two different levels of applied magnetic fields, respectively, resulting from the two given operating positions of the magnet. The transducer also has a temperature coefficient at its "operate" point which substantially tracks that of the magnet, thereby rendering the transducer operation essentially independent of ambient temperature changes. |
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DETAILED DESCRIPTION In designing a Hall-type transducer to operate in conjunction with a comparatively small, ferrite-composite magnet, between "ON" and "OFF" states over a wide range of temperatures, it is necessary to assure that transducer switching sensitivity is always adequate to cause actuation.
In the overall circuit operation, it is necessary to obtain a switching action each time the actuating magnet, usually a permanent magnet, is moved between first and second positions relative to the Hall cell, each of these positions being fixed distances from the Hall cell.
In the first position, the magnet is proximal to the Hall cell such that a maximum strength field is imposed thereon.
The second position is spaced from the Hall cell sufficiently to remove the field.
If desired, a further operation may be achieved by moving the magnet to a third position in which the opposite and equal strength pole of the magnet is disposed congruently with the first position.
It is desired that charge-of-state switching of the transducer be effected when the magnet pole is moved to the fixed distance of the first and second positions, respectively, throughout a temperature range of, for example, -40.
degree.
C.
to +150.
degree.
C.
In order to achieve this objective, it is necessary to take into consideration the variations in ambient temperature as they affect performance of both the magnet and integrated circuit, and also processing variables and stress gradients as they affect the integrated circuit itself.
The temperature coefficients, therefore, of both the magnet and integrated circuit must track as closely as possible so that each time the magnet is disposed the aforesaid fixed distances from the Hall cell, the desired switching action occurs irregardless of changes in ambient temperature.
The circuitry itself comprises a Hall cell, an amplifier therefor having an output circuit which provides a threshold voltage for a succeeding second amplifier, and an output driver responsive to the second amplifier output to produce a change-of-state ("ON"/"OFF") signal
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Semiconductor manufacture 
