Abstract: A circuit for operating an amperometric sensor having a reference electrode, a counter electrode and a work electrode. The circuit comprises an amplifier having a positive input and a negative input and an output. The positive input is coupled to a reference voltage source, and the negative input and the output are coupled together via a negative feedback loop. The circuit includes means for coupling the amperometric sensor into said negative feedback loop of the amplifier wherein, in a first configuration, the counter electrode is coupled to said output and the reference electrode is coupled to said negative input and, in a second configuration, the work electrode is coupled to said output and the reference electrode is coupled to said negative input.

Abstract: An integrated circuit having a plurality of circuit blocks, each block having one or more positive voltage supply pads, one or more negative voltage supply pads, and one or more signal pads. The integrated circuit further comprises an electrostatic protection circuit comprising a first electrostatic discharge protection rail for connection to a positive voltage supply point, a second electrostatic discharge protection rail for connection to a negative voltage supply point, and first protection circuitry coupling each said signal pad to both said first and second electrostatic discharge protection rails, the first protection circuitry being configured to provide a conduction path to one of the first and second rings in the event of an excessive voltage being present on one of said signal pads.

Abstract: An integrated circuit having a plurality of circuit blocks, each block having one or more positive voltage supply pads, one or more negative voltage supply pads, and one or more signal pads. The integrated circuit further comprises an electrostatic protection circuit comprising a first electrostatic discharge protection rail for connection to a positive voltage supply point, a second electrostatic discharge protection rail for connection to a negative voltage supply point, and first protection circuitry coupling each said signal pad to both said first and second electrostatic discharge protection rails, the first protection circuitry being configured to provide a conduction path to one of the first and second rings in the event of an excessive voltage being present on one of said signal pads.

Abstract: A method of calibrating a sensor system comprising a disposable sensor and a computer device, both the sensor and the computer device having circuitry for facilitating the transmission of data between them via a wireless communication link. The method comprises storing a final value of a monitored parameter obtained using a first disposable sensor, or some other value derivable from said final value, in a memory of the computer device, and calibrating the system for a new disposable sensor using said final value or said other value.

Abstract: A circuit for operating an amperometric sensor having a reference electrode, a counter electrode and a work electrode. The circuit comprises an amplifier having a positive input and a negative input and an output. The positive input is coupled to a reference voltage source, and the negative input and the output are coupled together via a negative feedback loop. The circuit includes means for coupling the amperometric sensor into said negative feedback loop of the amplifier wherein, in a first configuration, the counter electrode is coupled to said output and the reference electrode is coupled to said negative input and, in a second configuration, the work electrode is coupled to said output and the reference electrode is coupled to said negative input.

Abstract: A method of calibrating a sensor system comprising a disposable sensor and a computer device, both the sensor and the computer device having circuitry for facilitating the transmission of data between them via a wireless communication link. The method comprises storing a final value of a monitored parameter obtained using a first disposable sensor, or some other value derivable from said final value, in a memory of the computer device, and calibrating the system for a new disposable sensor using said final value or said other value.

Abstract: Apparatus for monitoring and or treating a substance or body. The apparatus comprises a sensor 1, at least a portion of which 6 is arranged in use to come into contact with a body, tissue, bodily fluid or other substance, and a computer device 3. Both the sensor 1 and the computer device 3 have radio frequency circuitry 12,16 for facilitating the transmission of data between them via a wireless communication link, the computer device 3 having means 15,17 for selecting wireless link transmission properties based upon user location, and for signalling these properties to the sensor 1.