Improving the linearity of the AD8361 “Tru-Pwr” RF detector IC

Author

Greenough, N.

Author_Institution

Princeton Plasma Phys. Lab., Princeton, NJ, USA

fYear

2011

fDate

26-30 June 2011

Firstpage

1

Lastpage

4

Abstract

The AD8361 is a wideband linear RMS radio-frequency (RF) detector IC widely used in the RF industry. This paper presents a method to extend the dynamic range of the detector to nearly 40 decibels, over a range from less than -30dBm to +8dBm with absolute accuracy typically +0.5/-1dB. In addition, most samples can be made to track to a very high degree over an even wider range. The increase in accuracy and tracking allows improved power calibration, real-time power regulation, and calculation of VSWR (voltage standing wave ratio) for the multimegawatt RF transmitters used to heat plasmas on NSTX at PPPL. The method presented here is simpler and lower cost than the dual-detector-amplifier technique presented by its manufacturer. Test results and distributions are presented for approximately 20 samples of a dual-detector module built by PPPL.

Keywords

Tokamak devices; detector circuits; fusion reactor ignition; fusion reactor instrumentation; integrated circuit reliability; integrated circuits; microwave detectors; plasma radiofrequency heating; plasma toroidal confinement; radio transmitters; AD8361 Tru-Pwr RF detector IC; NSTX; PPPL; VSWR calculation; detector IC linearity; detector dynamic range; multimegawatt RF transmitters; plasma heating; power calibration; real time power regulation; voltage standing wave ratio; wideband linear RMS radiofrequency detector IC; Correlation; Detectors; Laboratories; Potentiometers; Production; 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.2011.6052265

Filename

6052265