Ultra-broadband IF/LO system of NTU W-band interferometer array

Hsiao Feng Teng*, Jing Cheng Wu, Huan Hsin Li, Tzi Hong Chiueh, Dou Chih Niu, Shu-I Hu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

NTU-Array is designed for W-band (78-113Ghz) interferometric observations of Sunyaev-Zeldovich effects. The first phase operation of the telescope with 6 receivers had its first light in 2008 with single-polarization and half the full bandwidth. The second-phase operation of NTU-Array in Nevada will begin the dual-polarization, full-band observation in 2010. One-bit sampling at 18Ghz and digital correlation are in use in this telescope. Due to the ultra broadband coverage, the IF system divides the 35GHz full-band into four 8.7GHz sub-bands. The first stage of IF module containing a 35GHz broadband amplifier with fairly flat-gain performance over 25db gain divides the first-stage IF into two outputs. The 2nd-stage IF module further divides the two input IF signals and down-converts them to four basebands of DC-8.7Ghz. An LO module with 8.7Ghz input is to generate outputs with x2, x3 and x9 harmonics for the down-conversion. The Walsh function is injected into the x9 LO via an IQ mixer. Each IF baseband is transmitted through an optical link to the 18Ghz, 1-bit sampling ADC located in the control room. The analog optical link contains a driver and equalizer to compensate for the path loss. Considering the limited size of the telescope mount, the entire IF/LO system of each receiver has a compact size about 20cm cubed. This physical size can be further reduced to fit the future 19-pixel-receiver upgrade of NTU-Array.

Original languageEnglish
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V
DOIs
StatePublished - 7 Sep 2010
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V - San Diego, CA, United States
Duration: 29 Jun 20102 Jul 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7741
ISSN (Print)0277-786X

Conference

ConferenceMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V
CountryUnited States
CitySan Diego, CA
Period29/06/102/07/10

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