Method and apparatus for multi-channel sensor interface with programmable gain, offset and bias
a sensor interface and multi-channel technology, applied in logic circuit coupling/interface arrangement, program control, instruments, etc., can solve problems such as reducing system accuracy and vo+ and vo differences
Active Publication Date: 2017-12-21
EXAR CORP
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- Abstract
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- Application Information
AI Technical Summary
Benefits of technology
This solution enhances sensor accuracy and sensitivity by calibrating each channel independently, reducing noise and footprint, and supports a wide range of applications with low power consumption.
Problems solved by technology
However, inexact resistive values result in a difference between Vo+ and Vo−.
This bridge offset voltage can be substantial and vary between sensors causing decreased system accuracy.
Method used
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[0011]The present invention will now be described in detail with reference to the drawings, which are provided as illustrative examples of the invention so as to enable those skilled in the art to practice the invention. Notably, the figures and examples below are not meant to limit the scope of the present invention to a single embodiment, but other embodiments are possible by way of interchange of some or all of the described or illustrated elements.
[0012]Moreover, where certain elements of the present invention can be partially or fully implemented using known components, only those portions of such known components that are necessary for an understanding of the present invention will be described, and detailed descriptions of other portions of such known components will be omitted so as not to obscure the invention.
[0013]Embodiments described as being implemented in software should not be limited thereto, but can include embodiments implemented in hardware, or combinations of so...
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A highly integrated programmable sensor interface with improved sensor signal calibration and conditioning functions is described. The programmable sensor interface according to the present invention sensor interface provides programmable gain, digital offset correction and bias for one or more signal channels on one chip on a per channel basis. According to another aspect of the invention, the sensor interface provides reference voltage and sensor biasing by using an on-chip precision voltage regulator. According to one aspect of the invention, multiple inputs are multiplexed and each is applied to a variable gain instrumentation amplifier, which connects to the output. The offset of a given channel is controlled by an on-chip DAC which has multiple digital storage registers, allowing each channel to have a unique, stored offset. Offsets and gains are programmed externally.
Description
FIELD OF THE INVENTION[0001]Described are a method and apparatus for an integrated sensor interface, and particularly a sensor interface that provides programmable calibration and signal conditioning for one or more channels of input signals.BACKGROUND OF THE INVENTION[0002]Many force and pressure sensors utilize a strain gauge or Wheatstone bridge circuit. The resistive elements in the bridge change resistance in response to changes in sensed condition, such as in pressure or acceleration, or mechanical strain, which in turn cause the electrical output (e.g., voltage or current) to change corresponding to a change in the sensed condition.[0003]Typical bridge sensors have a differential output signal (Vo+ and Vo−). Ideally, the unloaded bridge output is zero (Vo+ and Vo− are identical). However, inexact resistive values result in a difference between Vo+ and Vo−. This bridge offset voltage can be substantial and vary between sensors causing decreased system accuracy.[0004]Different ...
Claims
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IPC IPC(8): G01D18/00G01D5/16
CPCG01D18/008G01D5/16H03K19/017509G05B19/0423G06F13/4282G01L1/225
Inventor SMITHWEDEL, DALE
Owner EXAR CORP