---
title: "What is the spurious-free dynamic range (SFDR), and how does it relate to Digital Direct Synthesis (DDS) and mixer calibration?"
date: "2024-03-22T14:46:21+00:00"
modified: "2024-03-22T14:46:21+00:00"
url: "https://www.quantum-machines.co/faq/what-is-the-spurious-free-dynamic-range-sfdr-and-how-does-it-relate-to-digital-direct-synthesis-dds-and-mixer-calibration/"
description: "Learn about SFDR's role in Digital Direct Synthesis (DDS) for generating clean waveforms, vital for quantum computing's qubit fidelity."
---

# What is the spurious-free dynamic range (SFDR), and how does it relate to Digital Direct Synthesis (DDS) and mixer calibration?

The spurious-free dynamic range (SFDR) is a measure of a system’s ability to generate a waveform without unwanted signals or harmonics that could interfere with the signal. In [Digital Direct Synthesis (DDS)](https://www.quantum-machines.co/technology/direct-digital-synthesis/) systems, a high SFDR is crucial for ensuring that the generated waveforms are clean and free from unwanted noise. This is particularly important in quantum computing, where signal purity directly impacts qubit fidelity.