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

fYear

2011

fDate

26-30 June 2011

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering (SOFE), 2011 IEEE/NPSS 24th Symposium on

Conference_Location

Chicago, IL

ISSN

1078-8891

Print_ISBN

978-1-4577-0669-1

Electronic_ISBN

1078-8891

Type

conf

DOI

10.1109/SOFE.2011.6052240

Filename

6052240