Patent ID: 7053674
Filing Date: 2006-05-30
Classification: G11C

Abstract:
1. A circuit, comprising; a capacitor having a threshold node; a selected one of: a comparator having a first comparator input node coupled to the threshold node, a second comparator input node coupled to the input node of the selected one of the charging circuit and the discharging circuit, and a comparator output node at which a comparator output signal is provided; a logic circuit having a logic circuit input node coupled to the comparator output node and a logic circuit output node at which a logic circuit output signal is provided in response to a predetermined period of time during which the comparator output signal has no transitions; and a switch having a first switch node coupled to the threshold node, a second switch node coupled to the selected one of the charging circuit input node and the discharging circuit input node, and a switch control node coupled to the logic circuit output node.