Millivolt output circuit for use with programmable sensor compensation integrated circuits

a technology of integrated circuits and output circuits, applied in the field of sensor methods and systems, can solve problems such as difficult implementation of perfect rail-to-rail circuits, and achieve the effect of facilitating understanding

Inactive Publication Date: 2006-06-22
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution enables the production of output signals that mimic Wheatstone bridge circuit outputs, facilitating the use of programmable ICs and improving sensor systems by providing a scalable and cost-effective solution for signal processing in sensor applications.

Problems solved by technology

A problem in practical, but sensitive sensor applications involves configuring some means of differentiating between transducer signals resulting from varying magnetic flux and unwanted transducer signals emanating from other environmental sources.
Due to the limitations of analog-to-digital and digital-to-analog converters, however, such configurations produce an amplified voltage output, which is typically in the range of 0.1 Volts to 4.9 Volts Also replace elsewhere in application, perfect rail-to-rail circuits are difficult to implement Unfortunately, there are presently no IC's available, which can produce an output similar to that of an unamplified Wheatstone bridge circuit.

Method used

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  • Millivolt output circuit for use with programmable sensor compensation integrated circuits
  • Millivolt output circuit for use with programmable sensor compensation integrated circuits
  • Millivolt output circuit for use with programmable sensor compensation integrated circuits

Examples

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Embodiment Construction

[0015] The particular values and configurations discussed in these non-limiting examples can be varied and are cited merely to illustrate at least one embodiment and are not intended to limit the scope of the claims disclosed herein.

[0016]FIG. 1 illustrates a schematic diagram of a circuit 100, which can be implemented in accordance with a preferred embodiment of the present invention. Circuit 100 generally includes a plurality or group 116 of bridge resistors 118, 120, 124, 122 and one or more connecting resistors 114 coupled to the bridge resistors 118, 120, 124, 122. Thus, a first bridge resistor 118 is connected to a second bridge resistor 124, which in turn is connected to a third bridge resistor 122. A fourth bridge resistor 120 is connected to the third bridge resistor 122. The connecting resistor 114 is generally connected to first bridge resistor 118 and fourth bridge resistor 120 at a node 134.

[0017] The connecting resistor 114 is also generally connected to a programmab...

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Abstract

An output sensor apparatus, system, and method are disclosed, including a circuit comprising a plurality of bridge resistors and one or more connecting resistors coupled to the plurality of bridge resistors. Additionally, a programmable amplifier can be coupled to the connecting resistor, wherein the circuit produces an output signal that changes in a manner similar to that of an output of a Wheatstone bridge circuit sensor. Thus, a circuit can be provided, which can be effortlessly added to a readily available programmable integrated circuit (IC) chip.

Description

TECHNICAL FIELD [0001] Embodiments are generally related to sensor methods and systems. Embodiments are also related to Wheatstone bridge circuits utilized in sensor applications. Embodiments are additionally related to programmable sensors and integrated circuits thereof. BACKGROUND OF THE INVENTION [0002] Wheatstone bridge circuits are utilizing in a variety of sensing applications, particularly those involving magneto-resistance, which is a phenomenon whereby the electrical resistance of a body can be influenced by magnetic flux. In such applications, the electrical resistance of the body changes in a predictable manner in response to a varying magnetic flux, making such a body suitable for use as a magnetic-electric transducer in a magnetic field sensor. However, as with any resistive body, the electrical resistance of such a body can also be influenced by other environmental factors, such as, for example, temperature. A problem in practical, but sensitive sensor applications in...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G01R27/28
CPCG01D3/02G01D5/145G01R17/10G01R33/09
InventorBENTLEY, IAN N.
OwnerHONEYWELL INT INC