Patent ID: 9065479
Filing Date: 2015-06-23
Classification: H03M

Abstract:
1. A multistring digital to analog converter, DAC, comprising: a first string with a plurality of impedance elements; a second string with a plurality of impedance elements; a first switching network adapted to couple a voltage produced across at least one of the impedance elements in the first string across the second string in response to a digital input signal, said digital signal comprising a digital bit stream, the impedance elements in the second string configured to produce voltages in response to current passing from the first string through the first switching network to the second string to produce a corresponding analog signal to said digital input signal to an output node, a second switching network comprising non-current carrying switches configured to provide at least one least significant bit, LSB, transition at the output node in response to a sensed change across the first switching network; and a control circuit coupled to a reference impedance, and configured to provide code dependent compensation for, or control of, variances in a response of switches within the DAC relative to the reference impedance.