Patent ID: 8183834
Filing Date: 2012-05-22
Classification: G01R,H03K

Abstract:
1. An apparatus comprising: a sensing element through which a battery operatively charges and discharges; a current-to-current converter coupled to the sensing element to generate a first current and a second current, the two currents correlated to current flowing through the sensing element such that the first current is zero relative to a nonnegative reference current when the second current is non-zero relative to the nonnegative reference current and the second current is zero relative to the nonnegative reference current when the first current is non-zero relative to the nonnegative reference current; and a capacitor coupled to the current-to-current converter, the current-to-current converter operatively delivers a difference current at a node of the capacitor, the difference current being the difference between the first current and the second current.