Patent ID: 8773106
Filing Date: 2014-07-08
Classification: G01N

Abstract:
1. A method of determining capacitance of a biosensor chamber having two electrodes disposed in the chamber and coupled to a microcontroller, the method comprising: initiating an electrochemical reaction of a sample upon deposition of the sample in the biosensor chamber; applying an oscillating signal of a predetermined frequency to the chamber; ascertaining a first sampling-time interval for measurement of an output signal based on a predetermined sampling rate per cycle of the output signal at the predetermined frequency; sampling the output signal from the chamber at a second sampling-time interval different than the first sampling-time interval such that a magnitude of each sampled output signal is measured at each succession of the second sampling-time interval instead of at the first time interval; determining a phase angle between an output signal and the oscillating input signal from the chamber based on the sampled output signal of the sampling step; and calculating a capacitance of the chamber from the phase angle.