Digital to analog converter and method for controlling current source array in digital to analog converter

A method for controlling a current source array in a digital to analog converter, wherein the digital to analog converter comprises a switch array and a current source array connected to the switch array;

• the switch array comprises 2n×2n−1 unit switches, which comprise 2n×(2n−1) high-order unit switches and 2n−1 low-order unit switches;
• the current source array comprises 2n×2n−1 unit current sources;
• each unit switch is configured to control an output of one unit current source;
• outputs of the 2n×2n−1 unit current source are used to generate an output of the digital to analog converter;
• n is a positive integer;
• and the method comprises:
• generating a 2n−1-bit first temperature code by using high n bits of an input 2n-bit binary digital signal, and generating a 2n−1-bit second temperature code by using low n bits of the 2n-bit binary digital signal, wherein any bit of the 2n−1-bit first temperature code is used to control 2n high-order unit switches, and any bit of the 2n−1-bit second temperature code is used to control one low-order unit switch;
• and
• controlling, by using the 2n−1-bit first temperature code and the 2n−1-bit second temperature code, a working sequence of the 2n×2n−1 unit switches in the following manner:
• switching, by using the 2n−1-bit first temperature code, all unit switches on any one of 2n−1 first diagonals in a 2n×2n matrix formed by the 2n×2n−1 unit switches, wherein all elements on the 2n−1 first diagonals correspond to the 2n×(2n−1) high-order unit switches;
• and switching all unit switches on a second diagonal except the 2n−1 first diagonals in the 2n×2n matrix according to a preset sequence and by using the 2n−1-bit second temperature code, wherein 2n−1 elements on the second diagonal correspond to the 2n−1 low-order unit switches.

A method for controlling a current source array in a digital to analog converter, used to control outputs of unit current sources comprised in the current source array, wherein the current source array comprises 2n×2n−1 unit current sources, n is a positive integer, and the method comprises:

• generating a 2n−1-bit first temperature code by using high n bits of an input 2n-bit binary digital signal, and generating a 2n−1-bit second temperature code by using low n bits of the 2n-bit binary digital signal, wherein any bit of the 2n−1-bit first temperature code is used to control 2n high-order unit switches, and any bit of the 2n−1-bit second temperature code is used to control one low-order unit switch;
• switching, by using the 2n−1-bit first temperature code, all unit switches on any one of 2n−1 first diagonals in a 2n×2n matrix formed by the 2n×2n−1 unit switches, wherein all elements on the 2n−1 first diagonals correspond to the 2n×(2−1) high-order unit switches, so as to control outputs of unit current sources corresponding to the 2n×(2−1) high-order unit switches in the current source array;
• and
• switching all unit switches on a second diagonal except the 2n−1 first diagonals in the 2n×2n matrix according to a preset sequence and by using the 2n−1-bit second temperature code, wherein 2n−1 elements on the second diagonal correspond to the 2n−1 low-order unit switches, so as to control outputs of unit current sources corresponding to the 2n−1 low-order unit switches in the current source array.