DAC Interpolation Bypass for Stable Low-Noise Signal Fidelity

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Solution Overview

Problem

In quantum computing systems, amplitude instability and noise generation occur due to power and heat fluctuations in electronic circuits, degrading signal fidelity and accuracy in low latency, high sensitivity environments.

Innovation Solution

A method and apparatus for processing digital signals in quantum computing systems that monitor for a predetermined pattern in the signal sequence, switching between waveform and bypass modes to stabilize amplitude and reduce noise by injecting noise into the interpolation component, using tuning samples to maintain consistent computational load.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If interpolation is used to improve signal resolution, then signal fidelity is improved, but amplitude instability and noise are generated due to power and heat fluctuations

Engineering Contradiction:

Improvesignal resolutionVSAvoidamplitude stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system performs preliminary actions by detecting predetermined patterns in the digital signal sequence before interpolation occurs. When a predetermined pattern is detected, the system proactively switches to bypass mode, preventing the amplitude instability and noise that would otherwise be generated by the interpolation component during problematic signal conditions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically switches between two operational modes: interpolation mode for normal signal processing and bypass mode when predetermined patterns are detected. This dynamic adaptation allows the system to maintain signal fidelity during normal operation while avoiding amplitude instability and noise generation when signal conditions deteriorate.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If interpolation component is used continuously, then signal resolution is maintained, but power fluctuations and heat generation increase

Engineering Contradiction:

Improvesignal resolutionVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

Instead of continuous operation, the interpolation component operates periodically based on signal conditions. The system continuously monitors the digital signal sequence for predetermined patterns and alternates between using the interpolation component and bypassing it, creating a periodic operation pattern that reduces overall power consumption while maintaining signal resolution when needed.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system extracts or removes the interpolation component from the signal path during periods when predetermined patterns are detected. By taking the interpolation component out of operation during problematic signal conditions, the system reduces power consumption and heat generation while preserving the ability to restore high-resolution processing when signal conditions improve.

Inventive Principle:

Principle #2Taking out (Extraction)

3Measurement precision

If interpolation component processes all samples, then signal accuracy is improved, but noise is generated and amplified

Engineering Contradiction:

Improvesignal accuracyVSAvoidnoise

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The system applies preliminary anti-action by detecting predetermined patterns that precede noise generation and amplification. When these patterns are detected, the system preemptively switches to bypass mode, counteracting the potential noise generation before it occurs. This preliminary protective action prevents noise from being generated and amplified by the interpolation component.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The system converts the harmful effect of continuous interpolation (noise generation) into a benefit by using the predetermined pattern detection as a trigger mechanism. The detection of problematic signal patterns, which would normally lead to noise generation, is instead used to intelligently control when interpolation should be bypassed, transforming what would be a harmful continuous operation into a beneficial conditional operation that avoids noise while maintaining accuracy.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12562942B2Enhancing signal fidelity during interpolation

Publication Date: 2026.02.24 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

An apparatus is provided for processing a digital signal for a digital-to-analog converter (“DAC”). The apparatus includes a monitoring component configured to monitor a sequence of samples of the digital signal for a predetermined pattern of signal values. Upon determining that the sequence of samples does include the predetermined pattern of signal values, then samples in the sequence of samples that include the predetermined pattern of signal values are sent to the DAC. Noise is injected into an interpolation component, and the noise is withheld from an output of the DAC.