Analyte monitoring device and methods

  • US 9,980,669 B2
  • Filed: 11/07/2012
  • Issued: 05/29/2018
  • Est. Priority Date: 11/07/2011
  • Status: Active Grant
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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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