US 10,948,933 B2 · Digital-to-analog converter power-up control

Abstract

A digital-to-analog converter includes a resistor ladder, a first switch and a protection circuit. The first switch includes a first terminal and a second terminal that are respectively coupled to a rung of the resistor ladder and a reference voltage node. The protection circuit is coupled to the reference voltage node and to a reference voltage input terminal. The protection circuit includes a second switch, a third switch, and a fourth switch. First and second terminals of the second switch are respectively coupled to the reference voltage node and the reference voltage input terminal. First and second terminals of the third switch are respectively coupled to the reference voltage node and a reference voltage feedback terminal. The first and second terminals of the fourth switch are respectively coupled to the reference voltage input terminal and the reference voltage feedback terminal.

Claims20

Dependent claims

A digital-to-analog converter, comprising:

a resistor ladder, the resistor ladder comprising;
a rung having a first terminal and a second terminal;
a first switch comprising:
a first terminal coupled to the second terminal of the rung;
and
a second terminal coupled to a first reference voltage;
a protection circuit coupled to the first reference voltage and to a reference voltage input, the protection circuit comprising:
a second switch comprising:
a first terminal coupled to the first reference voltage;
and
a second terminal coupled to the first reference voltage input;
a third switch comprising:
a first terminal coupled to the first reference voltage;
and
a second terminal coupled to a second reference voltage;
a fourth switch comprising:
a first terminal coupled to the reference voltage input;
and
a second terminal coupled to the second reference voltage.

16 more elements

An integrated circuit, comprising:

a digital-to-analog converter, comprising:
a resistor ladder;
a first switch coupled between a first reference voltage and a rung of the resistor ladder;
a second switch coupled between a second reference voltage and the rung of the resistor ladder;
a first reference voltage input configured to receive a first reference voltage;
a second reference voltage input configured to receive a second reference voltage;
a first protection circuit coupled to the first reference voltage and the first reference voltage input, and comprising:
a third switch coupled between the first reference voltage and the first reference voltage input through a first resistor;
and
a fourth switch coupled between the first reference voltage and the first reference voltage input;
a second protection circuit coupled to the second reference voltage and the second reference voltage input, and comprising:
a fifth switch coupled between the second reference voltage and the second reference voltage input terminal through a second resistor;
and
a sixth switch coupled between the second reference voltage and the second reference voltage;
and
power-up control circuitry configured to:
close the third switch and the fifth switch during a power-up interval;
open the fourth switch and the sixth switch during the power-up interval;
and
close the fourth switch and the sixth switch after expiration of the power-up interval.

17 more elements

A method, comprising:

in a digital-to-analog converter comprising a resistor ladder, a first switch coupled between a first reference voltage and a rung of the resistor ladder, and a second switch coupled between a second reference voltage and the rung of the resistor ladder:
closing, in a power-up interval:
a third switch to couple the first reference voltage to a first reference voltage input through a first resistor;
and
a fourth switch to couple the second reference voltage to a second reference voltage input through a second resistor;
opening, in the power-up interval:
a fifth switch that couples the first reference voltage to the first reference voltage input;
and
a sixth switch that couples the second reference voltage to the second reference voltage input;
and
closing, after expiration of the power-up interval, the fifth switch and the sixth switch.

8 more elements

Dependencies are inferred from the claim text.

Digital-to-analog converter power-up control

Life of this patent

Digital-to-analog converter power-up control

Life of this patent

Abstract

Claims20