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A fully hardware-implemented phase calculating system for the feedback controlin the lower-hybrid current drive(LHCD)experiments is presented in this paper.By takingadvantages of field programmable gate array(FPGA)chips with embedded digital signal processing(DSP)cores and the Matlab-aided design method,the phase calculating algorithm with a squareroot operation and parallel process are efficiently implemented in a single FPGA chip to completethe calculation of phase differences fast and accurately in the lower-hybrid wave(LHW)systemon EAST.
A fully hardware-implemented phase calculating system for the feedback control in the lower-hybrid current drive (LHCD) experiments is presented in this paper. By taking advantage of field programmable gate array (FPGA) chips with embedded digital signal processing (DSP) cores and the Matlab-aided design method, the phase calculating algorithm with a square root operation and parallel process are efficiently implemented in a single FPGA chip to complete the calculation of phase differences fast and accurately in the lower-hybrid wave (LHW) systemon EAST.