Patent ID: 8213213
Filing Date: 2012-07-03
Classification: G11C

Abstract:
1. A reference current generator for a resistance type memory, comprising: N parallel circuit sets, where N is an integer greater than 1, each of the N parallel circuit sets being formed with at least one first reference element and at least one second reference element connected in parallel to each other, and the number of the first reference elements plus the number of the second reference elements being N in each of the N parallel circuit sets, and each of the first reference elements being provided with a first resistance value and each of the second reference elements being provided with a second resistance value different from the first resistance value; and N control terminals, each of the N control terminals respectively connected to a gate of a switching transistor of each of the first reference elements and each of the second reference elements in each of the N parallel circuit sets to provide N bias voltages correspondingly; wherein the N parallel circuit sets are connected in series between an input terminal and an output terminal to form an equivalent resistance provided with a equivalent resistance value between the first resistance value and the second resistance value, and a reference current is outputted from the output terminal by applying an operation voltage to the input terminal; wherein each of the first reference elements is formed with a non-volatile resistance element and the switching transistor connected in series to the non-volatile resistance element, and each of the second reference elements is formed with the non-volatile resistance element and the switching transistor connected in series to the non-volatile resistance element.