Blood sugar lever measuring device and semiconductor integrated circuit
First Claim
1. A blood sugar level measuring device, comprising:
- a sensor receiving section for receiving a blood sugar level sensor, sensing a current that flows through the blood sugar level sensor according to a blood sugar level in response to a prescribed voltage applied thereto, and outputting the sensed current;
a current-voltage converter for converting the current received from the sensor receiving section into a voltage; and
a Δ
Σ
-type analog-digital (A-D) converter for converting an analog signal received from the current-voltage converter into a digital signal.
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Accused Products
Abstract
A ΔΣ-type analog-digital (A-D) converter is used for A-D conversion of a blood sugar level measured by a blood sugar sensor. This enables an accurate measurement result to be obtained with improved resolution. Using the measurement result of an offset voltage in a current-voltage converter enables compensation for the offset voltage. Moreover, using the measurement result of a blood sugar level obtained with a current being applied to a dummy resistor, i.e., an element that simulates electric characteristics of the blood sugar level sensor, enables compensation for variation in the measured value between individual devices resulting from manufacturing variation. As a result, a more precise blood sugar level measuring device having higher measurement accuracy can be implemented.
51 Citations
14 Claims
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1. A blood sugar level measuring device, comprising:
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a sensor receiving section for receiving a blood sugar level sensor, sensing a current that flows through the blood sugar level sensor according to a blood sugar level in response to a prescribed voltage applied thereto, and outputting the sensed current;
a current-voltage converter for converting the current received from the sensor receiving section into a voltage; and
a Δ
Σ
-type analog-digital (A-D) converter for converting an analog signal received from the current-voltage converter into a digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A blood sugar level measuring device, comprising:
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a blood sugar level sensor for allowing a current to flow therethrough according to a blood sugar level;
a current-voltage converter for converting the current flowing through the blood sugar level sensor into a voltage; and
a Δ
Σ
-type analog-digital (A-D) converter for converting an analog signal from the current-voltage converter into a digital signal. - View Dependent Claims (13, 14)
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12. A semiconductor integrated circuit, comprising:
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a first terminal for receiving a current from a blood sugar level sensor for allowing a current to flow therethrough according to a blood sugar level;
a sense amplifier for converting the current applied to the first terminal into a voltage;
a second terminal capable of connecting a feedback resistor between an input and output of the sense amplifier; and
a Δ
Σ
-type analog-digital (A-D) converter for converting an analog signal from the sense amplifier into a digital signal.
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Specification