Patent ID: 8564470
Filing Date: 2013-10-22
Classification: H03M

Abstract:
1. An analog-to-digital conversion circuit comprising: a register for storing a digital register value; a digital-to-analog converter that is configured to provide a reference current at a first circuit node which is set in accordance with the digital register value, an electric potential of the first circuit node being responsive to the reference current set, wherein the first circuit node is configured to receive an input measurement current; a comparator circuit that is configured to compare a potential of the first circuit node with at least one threshold, thereby assessing whether the potential of the first circuit node is at least approximately at a desired value; control circuitry that is responsive to the comparator circuit and that is configured to adjust the digital register value stored in the register and thus to adjust the reference current until the comparator circuit indicates that the potential of the first circuit node does not deviate from the desired value; and a sense transistor coupled to a load transistor, the sense transistor providing a measurement current to the first circuit node, the load transistor providing a load current to a second circuit node.