Patent ID: 11936395
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A digital-to-analog converter (DAC) on an integrated circuit, comprising:
an output terminal;
a first reference voltage terminal adapted to receive a first reference voltage;
a second reference voltage terminal adapted to receive a second reference voltage;
an input code terminal adapted to receive an input code;
multiple switches, ones of the switches configured to couple to the first reference voltage terminal after being activated, and to couple to the second reference voltage terminal after being deactivated;
multiple resistors variously coupled, in series or in parallel, between corresponding ones of the switches and the output terminal, so that activating one or more of the switches causes the DAC to output an output voltage; and
a controller coupled to the input code terminal and coupled to control the switches, and configured to:
generate an output code based on the input code in response to at least one differential nonlinearity (DNL) error of the DAC greater than one least significant bit (LSB) voltage, the input code corresponding to a first ideal output voltage of the DAC, the output code corresponding to a second ideal output voltage of the DAC different from the first ideal output voltage of the DAC; and
generate an output voltage of the DAC by using the output code to control the switches;

wherein one LSB voltage equals an ideal voltage output corresponding to activating only a lowest significant bit binary arm of the DAC.