SiT9501 Considerations for Measuring Phase Noise in Differential Oscillators

PublishTime：2021-07-12

■Introduction:
SiTime's differential oscillators feature excellent phase jitter performance for their respective class of products. For example, the SiT9501 oscillator features 70 fs rms of phase jitter, measured by integrating phase noise over an offset-frequency range of 12 kHz to 20 MHz. SiTime's differential oscillators employ a differential output driver with excellent power-supply noise rejection and an ultra-low output-noise floor. The differential driver also reduces common-mode noise sources internal to the device and power supply noise, as illustrated in Figure 1, leading to better than -170 dBc/Hz at a 156.25MHz clock frequency for the SiT9501. This document describes test methodologies to measure the true performance of the following ultra-low jitter devices using differential measurements.

Brand of Product：	SiTime
Part#：	SiT9501 、 SiT937x More Part#
Product Category：	differential oscillators 、 differential driver 、 differential output driver More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	Sep 23, 2020
Version Number：	Rev 1.0
Data Encoding：	SiT-AN10067
Data Size：	268 KB

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