Title :
New IQ demodulator development in diagnostic equipment for fusion energy research
Author :
Kung, C.C. ; Kramer, G.J. ; Wilson, J.R.
Author_Institution :
Princeton Plasma Phys. Lab., Princeton, NJ, USA
Abstract :
New IQ demodulator, which will be used in the reflectometry system, was developed for the Alcator C-Mod experiments. Because the demodulator itself is a 4 mm × 4 mm integrated circuit chip and has very wide operational bandwidth (0.7 GHz - GHz), it can be mounted on a circuit board with its low frequency IQ outputs connecting directly to gain control and dc offset adjustment circuits. This whole circuitry is realized on a 4"×2.5" printed circuit board and can be well tailored to meet the requirements for any type of data collection system. Since the RF and LO ports are operated at very narrow bandwidth in this application, single stub match circuits are designed to improve the ports matching as well as serve as a single pole filter.
Keywords :
Tokamak devices; UHF integrated circuits; demodulators; fusion reactor instrumentation; gain control; plasma toroidal confinement; printed circuit layout; Alcator C-Mod experiment; IQ demodulator; data collection system; dc offset adjustment circuits; diagnostic equipment; frequency 0.7 GHz to 2.7 GHz; fusion energy research; gain control; integrated circuit chip; low frequency IQ outputs; pole filter; printed circuit board; reflectometry system; stub match circuits; very wide operational bandwidth; Demodulation; Radio frequency;
Conference_Titel :
Fusion Engineering (SOFE), 2011 IEEE/NPSS 24th Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4577-0669-1
Electronic_ISBN :
1078-8891
DOI :
10.1109/SOFE.2011.6052240
