Patent ID: 9410915
Filing Date: 2016-08-09
CPC Classification: G01N

Claim Text:
1. A circuit for a test meter adapted to be operatively coupled to a biosensor strip, the circuit comprising: a difference amplifier having first and second difference amplifier inputs and a difference amplifier output, wherein the first difference amplifier input is operatively coupled to a first connector contact of the test meter and the second difference amplifier input is operatively coupled to a second connector contact of the test meter; a commanded voltage signal source; a voltage follower amplifier having first and second voltage follower inputs and a voltage follower output, wherein the first voltage follower input is coupled to the commanded voltage signal source, the second voltage follower input is coupled to the difference amplifier output, and the voltage follower output is configured to be operatively coupled to a third connector contact of the test meter; and a fourth connector contact of the meter operatively coupled to a microprocessor of the circuit configured to receive and process signals from a biosensor strip; wherein the first, second, third, and fourth connector contacts are configured to be operatively coupled to respective first, second, third, and fourth contact pads of a corresponding biosensor strip inserted into the test meter, and wherein the difference amplifier output represents a voltage difference between the first and second connector contacts of the test meter, and wherein the voltage follower amplifier is operatively configured to generate a voltage from the voltage follower output such that the voltage at the second voltage follower input is generally equal to the voltage at the first voltage follower input.