Cart (Loading....) | Create Account
Close category search window

A Beam Phase and Energy Measurement Instrument Based on Direct RF Signal IQ Undersampling Technique

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
Shaochun Tang ; Dept. of Modern Phys., Univ. of Sci. & Technol. of China, Hefei, China ; Lei Zhao ; Shubin Liu ; Xinjun Hao
more authors

A diagnostic instrument being designed to measure the beam phase and energy of the drift tube linac in the proton accelerator of the China Spallation Neutron Source is described, and the characterization of the system is presented. The signals received from fast current transformers are radio-frequency (RF) signals with a frequency of 352.2 MHz and a dynamic range from -30 to 3.5 dBm. The RF signals are converted to orthogonal streams directly with the in- and quadrature-phase undersampling technique based on high-speed high-resolution analog-to-digital (A/D) conversion. To guarantee a high-quality A/D conversion, two different sampling clock circuits are designed with corresponding simulations and tests conducted for comparison. To build a stand-alone instrument with compact architecture, all digital signal processing algorithms are implemented within one single field-programmable gate array; meanwhile, a Nios II embedded system is also integrated in it for data transfer through the Ethernet. This system achieves a phase resolution better than 0.09° over the input signal amplitude range from -41 to 7 dBm, well beyond the 0.5° required.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:61 ,  Issue: 11 )

Date of Publication:

Nov. 2012

Need Help?

IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.