Amplitude-driven at-speed control of digital-to-analog converters

Patent metadata

Field	Value
Publication number	US-2025379590-A1
Application number	US-202418738559-A
Country	US
Kind code	A1
Filing date	Jun 10, 2024
Priority date	Jun 10, 2024
Publication date	Dec 11, 2025
Grant date	—

Abstract

Systems and techniques that facilitate amplitude-driven at-speed control of digital-to-analog converters are provided. In various embodiments, a system can comprise a digital-to-analog converter that is configured to generate an analog waveform based on a digital amplitude indicator sequence. In various aspects, the system can comprise a processor that is configured to reset an operating characteristic of the digital-to-analog converter in response to detection of a defined digital amplitude indicator subsequence in the digital amplitude indicator sequence. In various instances, the operating characteristic can be operation of a numerically controlled oscillator of the digital-to-analog converter.

First claim

What is claimed is:

1 . A system, comprising:
a digital-to-analog converter that is configured to generate an analog waveform based on a digital amplitude indicator sequence; and a processor that is configured to reset an operating characteristic of the digital-to-analog converter in response to detection of a defined digital amplitude indicator subsequence in the digital amplitude indicator sequence.

2 . The system of claim 1 , wherein the operating characteristic is operation of a numerically controlled oscillator of the digital-to-analog converter.

3 . The system of claim 2 , wherein the digital amplitude indicator sequence corresponds to a baseband waveform produced by a field programmable gate array.

4 . The system of claim 3 , wherein the digital-to-analog converter mixes the baseband waveform with an internal waveform produced by the numerically controlled oscillator, and wherein a core of the digital-to-analog converter computes the analog waveform based on a result of such mixing.

5 . The system of claim 4 , wherein resetting the operation of the numerically controlled oscillator in response to detection of the defined digital amplitude indicator subsequence causes a phase of the analog waveform to be synchronized with the baseband waveform, regardless of a frequency implemented by the numerically controlled oscillator.

6 . The system of claim 4 , wherein the digital-to-analog converter transmits the analog waveform to a qubit of a quantum computer, thereby causing the qubit to perform a quantum operation.

7 . The system of claim 6 , wherein a frequency implemented by the numerically controlled oscillator is not an integer multiple of a clock frequency associated with the digital-to-analog converter.

8 . The system of claim 4 , wherein the defined digital amplitude indicator subsequence is a threshold number of consecutive zero-amplitude indicators produced by the field programmable gate array.

9 . A computer-implemented method, comprising:
generating, by a digital-to-analog converter, an analog waveform based on a digital amplitude indicator sequence; and resetting, by a processor coupled to the digital-to-analog converter, an operating characteristic of the digital-to-analog converter in response to detection of a defined digital amplitude indicator subsequence in the digital amplitude indicator sequence.

10 . The computer-implemented method of claim 9 , wherein the operating characteristic is operation of a numerically controlled oscillator of the digital-to-analog converter.

11 . The computer-implemented method of claim 10 , wherein the digital amplitude indicator sequence corresponds to a baseband waveform produced by a field programmable gate array.

12 . The computer-implemented method of claim 11 , wherein the digital-to-analog converter mixes the baseband waveform with an internal waveform produced by the numerically controlled oscillator, and wherein a core of the digital-to-analog converter computes the analog waveform based on a result of such mixing.

13 . The computer-implemented method of claim 12 , wherein resetting the operation of the numerically controlled oscillator in response to detection of the defined digital amplitude indicator subsequence causes a phase of the analog waveform to be synchronized with the baseband waveform, regardless of a frequency implemented by the numerically controlled oscillator.

14 . The computer-implemented method of claim 12 , further comprising:
transmitting, by the digital-to-analog converter, the analog waveform to a qubit of a quantum computer, thereby causing the qubit to perform a quantum operation.

15 . The computer-implemented method of claim 14 , wherein a frequency implemented by the numerically controlled oscillator is not an integer multiple of a clock frequency associated with the digital-to-analog converter.

16 . The computer-implemented method of claim 12 , wherein the defined digital amplitude indicator subsequence is a threshold number of consecutive zero-amplitude indicators produced by the field programmable gate array.

17 . A computer program product for facilitating amplitude-driven at-speed control of digital-to-analog converters, the computer program product comprising a non-transitory computer-readable memory having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to:
monitor a digital amplitude indicator sequence from which a digital-to-analog converter produces an analog waveform; and reset an operating characteristic of the digital-to-analog converter in response to detection of a defined digital amplitude indicator subsequence in the digital amplitude indicator sequence.

18 . The computer program product of claim 17 , wherein the operating characteristic is operation of a numerically controlled oscillator of the digital-to-analog converter.

19 . The computer program product of claim 18 , wherein the digital amplitude indicator sequence corresponds to a baseband waveform produced by a field programmable gate array.

20 . The computer program product of claim 19 , wherein the digital-to-analog converter mixes the baseband waveform with an internal waveform produced by the numerically controlled oscillator, wherein a core of the digital-to-analog converter computes the analog waveform based on a result of such mixing, and wherein resetting the operation of the numerically controlled oscillator in response to detection of the defined digital amplitude indicator subsequence causes a phase of the analog waveform to be synchronized with the baseband waveform, regardless of a frequency implemented by the numerically controlled oscillator.

Assignees

• IBM

Inventors

• Betke Jarrett
• Lindquist Timothy
• Zettles Iv George Russell

Classifications

• H03K3/037

  Bistable circuits · CPC title

• H03M1/66 Primary

  Digital/analogue converters ({H03M1/001 – } H03M1/10 take precedence) · CPC title