Patent ID: 7532142
Filing Date: 2009-05-12
Classification: H03M

Abstract:
1. A design structure embodied in a machine readable medium for designing, manufacturing, or testing, the design structure comprising a digital to analog converter on an integrated circuit, the digital to analog converter comprising: an output node; a first plurality of resistors coupled in series to receive a first reference voltage and a second reference voltage, the first plurality of resistors having a first resistance; an array of first switches, each first switch being coupled between the output node and a respective resistor of the first plurality of resistors; a second plurality of resistors coupled in series to receive the first reference voltage and the second reference voltage, the second plurality of resistors having a resistance lower than the first resistance; a control unit including a resistor, the control unit configured to generate a pulse having a width that is an increasing function of the resistor value; and an array of second switches, each second switch having a control input responsive to the pulse, and a current path coupled between a respective node in the second plurality of resistors and a respective node in the first plurality of resistors, each respective node in the first plurality of resistors being configured to receive a voltage greater than the first reference voltage and less than the second reference voltages.