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Method and apparatus used for determining measured value ??of chemical sensitive field effect transistor

A field effect transistor, chemically sensitive technology, applied in the field of computer program products, a device for measuring values, can solve the problem that the sensor does not provide the absolute signal of the concentration, etc., to reduce the measurement bandwidth, reduce the environmental impact, and improve the signal-to-noise ratio Effect

Active Publication Date: 2012-12-12
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But here the sensor does not provide an absolute signal of the concentration

Method used

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  • Method and apparatus used for determining measured value ??of chemical sensitive field effect transistor
  • Method and apparatus used for determining measured value ??of chemical sensitive field effect transistor
  • Method and apparatus used for determining measured value ??of chemical sensitive field effect transistor

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Embodiment Construction

[0037] The chemical sensitive field effect transistor (ChemFET) is a new technology for measuring analytes in gas or liquid phase. In this case, the application of the test object to be probed to the gate of the transistor usually leads to a change in the potential at the gate electrode and thus to a change in the channel current in the transistor. The channel current of the field effect transistor is always several orders of magnitude larger than the channel current change due to the application of the test article at the selected operating point. This places high demands on the current measurement. External interfering influences such as temperature changes or sensor degradation lead to changes in the channel current and are not based on the presence of the test article. To compensate for interfering influences, for example, reference transistors can be used which are insensitive to the substance to be detected. Preferably the reference element is identical in terms of sem...

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Abstract

The invention relates to a method and an apparatus used for determining a measured value ??of a chemical sensitive field effect transistor. The method has the steps of providing a first signal and a second signal, wherein at least the first signal is amplified by using an amplification factor. In addition, the method further comprises a step of providing the first signal to the chemical sensitive field effect transistor to obtain output information. The second signal is also provided for a reference transistor to obtain reference information, wherein the chemical sensitive field effect transistor is provided with fluid to-be-measured, and the reference transistor is in the reference environment. In addition, the method also includes a step of comparing the output information and the reference information in response to the comparison result to match the amplification factor. The method further comprises a step of analyzing the amplification factor to obtain the measured value.

Description

technical field [0001] The invention relates to a method for determining a measured value of a chemically sensitive field effect transistor, a device for determining a measured value of a chemically sensitive field effect transistor and a corresponding computer program product. Background technique [0002] In a sensor sensitive to a chemical, the output signal is related to the concentration of the chemical in the sample or medium to be analyzed. However, the sensor does not provide an absolute signal of the concentration here. Instead, the signal is subject to continuous or "hidden" variation or drift. To counter this, another sensor can be used as a reference sensor. The reference sensor is ideally subject to the same aging processes and environmental influences as the sensor and thus has the same changes or drifts. The concentration of the chemical substance in the sample can then be deduced from the signal and the reference signal. [0003] US 6703241 B1 describes a...

Claims

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Application Information

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IPC IPC(8): G01N27/414
CPCG01N27/414G01N27/4148
Inventor T.齐博尔德P.内夫
Owner ROBERT BOSCH GMBH