Analyte monitoring device and methods
First Claim
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1. An analyte monitoring device, comprising:
- an analyte sensor having a plurality of sensor electrodes including a working electrode, a reference electrode and a counter electrode, the analyte sensor having at least a portion configured to be in contact with fluid under a skin surface, wherein the plurality of sensor electrodes generate at least one signal corresponding to a monitored analyte level in the fluid; and
sensor electronics coupled to the plurality of sensor electrodes of the analyte sensor, the sensor electronics including analog front end circuitry that includes an analog-to-digital converter configured to convert an analog voltage signal from the counter electrode to digital form,wherein the analog front end circuitry comprises a first amplifier coupled to the reference electrode and to a first guard trace around the reference electrode,wherein the analog front end circuitry comprises a second amplifier coupled to the counter electrode and to a second guard trace around the counter electrode, the first amplifier being different than the second amplifier,wherein the analog front end circuitry is referenced to a reference potential; and
wherein the analyte monitoring device further comprises a charge pump coupled with a power supply, wherein the charge pump is adapted to boost power supply voltage, wherein the first amplifier is coupled to the charge pump to receive a boosted voltage from the charge pump, and wherein the analog-to-digital converter is configured to receive a voltage from the power supply that is different from the boosted voltage received by the first amplifier.
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Abstract
Methods and devices for providing application specific integrated circuit architecture for a two electrode analyte sensor or a three electrode analyte sensor are provided. Systems and kits employing the same are also provided.
1896 Citations
16 Claims
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1. An analyte monitoring device, comprising:
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an analyte sensor having a plurality of sensor electrodes including a working electrode, a reference electrode and a counter electrode, the analyte sensor having at least a portion configured to be in contact with fluid under a skin surface, wherein the plurality of sensor electrodes generate at least one signal corresponding to a monitored analyte level in the fluid; and sensor electronics coupled to the plurality of sensor electrodes of the analyte sensor, the sensor electronics including analog front end circuitry that includes an analog-to-digital converter configured to convert an analog voltage signal from the counter electrode to digital form, wherein the analog front end circuitry comprises a first amplifier coupled to the reference electrode and to a first guard trace around the reference electrode, wherein the analog front end circuitry comprises a second amplifier coupled to the counter electrode and to a second guard trace around the counter electrode, the first amplifier being different than the second amplifier, wherein the analog front end circuitry is referenced to a reference potential; and wherein the analyte monitoring device further comprises a charge pump coupled with a power supply, wherein the charge pump is adapted to boost power supply voltage, wherein the first amplifier is coupled to the charge pump to receive a boosted voltage from the charge pump, and wherein the analog-to-digital converter is configured to receive a voltage from the power supply that is different from the boosted voltage received by the first amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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positioning at least a portion of an analyte sensor in contact with fluid under a skin surface, the analyte sensor having a plurality of sensor electrodes including a working electrode, a reference electrode and a counter electrode, wherein the plurality of sensor electrodes of the analyte sensor generate at least one signal corresponding to a monitored analyte level in the fluid and are coupled to sensor electronics, wherein the sensor electronics include analog front end circuitry comprising an analog-to-digital converter; and converting, by the analog-to-digital converter, an analog voltage signal from the counter electrode to digital form; wherein the analog front end circuitry of the sensor electronics is referenced to a reference potential, wherein a first guard trace is around the reference electrode and a second guard trace is around the counter electrode, wherein a first amplifier is coupled to the reference electrode and the first guard trace, wherein a second amplifier is coupled to the counter electrode and the second guard trace, the first amplifier being different than the second amplifier, and wherein the first amplifier receives a boosted voltage from a charge pump adapted to boost power supply voltage, and wherein the analog-to-digital converter receives a voltage from the power supply that is different from the boosted voltage received by the first amplifier. - View Dependent Claims (13, 14, 15, 16)
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Specification