Design and Development of Amplitude and phase measurement of RF signal with Digital I-Q Demodulator

10th Asia Plasma and Fusion Association Conference

Soni, Dipal^1 ; Rajnish, Kumar^1 ; Verma, Sriprakash^1 ; Patel, Hriday^1 ; Trivedi, Rajesh^1 ; Mukherjee, Aparajita^1

ITER-India, Institute for Plasma Research, Near Indira Bridge, Bhat, Gandhinagar, Gujarat

382 428, India^1

关键词: Amplitude and phase measurements;    Cascaded amplifiers;    Design and Development;    Intermediate frequencies;    Ioncyclotron heating;    Lab-view softwares;    National Instruments;    Radio frequency power;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/823/1/012058/pdf
DOI  :  10.1088/1742-6596/823/1/012058

来源: IOP

【 摘 要 】

ITER-India, working as a nodal agency from India for ITER project [1], is responsible to deliver one of the packages, called Ion Cyclotron Heating & Current Drive (ICH&CD) - Radio Frequency Power Sources (RFPS). RFPS is having two cascaded amplifier chains (10 kW, 130 kW & 1.5 MW) combined to get 2.5 MW RF power output. Directional couplers are inserted at the output of each stage to extract forward power and reflected power as samples for measurement of amplitude and phase. Using passive mixer, forward power and reflected power are down converted to 1MHz Intermediate frequency (IF). This IF signal is used as an input to the Digital IQ Demodulator (DIQDM). DIQDM is realized using National Instruments make PXI hardware & LabVIEW software tool. In this paper, Amplitude and Phase measurement of RF signal with DIQDM technique is described. Also test results with dummy signals and signal generated from low power RF systems is discussed here.