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Clock Jitter Analysis and Measurement of Digital LLRF System
Author(s): 
Pages: 1456-1460,1493
Year: Issue:  12
Journal: Nuclear Electronics & Detection Technology

Keyword:  ADSLLRFIQquadrature demodulationloop close controlclock Jitter;
Abstract: This independently R&D LLRF control system operating frequency is 162.5 MHz, developed by IMP-CAS, which consists of superconductive cavity resonance frequency control , cavity voltage amplitude stability control and phase stability control .The LLRF system is based on IQ quadrature demodulation techniques , which is completely digitized feedback control and close loop system .Clock jitter of the system is critically im-portant for the LLRF stability and performance .In the paper , clock jitter is measured online via direct measure-ment, meanwhile the LLRF stability and performance is tested from different clock system .The mechanism of the influence of clock jitter to LLRF system is analyzed .Finally, on the basis of experimental data and clock jitter analysis result , the reasonable technical specification for LLRF control system is put forward .
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