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; Robert Hu

doi:10.1117/12.857833

15 July 2010 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, Robert Hu

Proceedings Volume 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V; 774116 (2010) https://doi.org/10.1117/12.857833
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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

Citation Download Citation

Hsiao-Feng Teng, Jing-Cheng Wu, Huan-Hsin Li, Tzi-Hong Chiueh, Dou-Chih Niu, and Robert Hu "Ultra-broadband IF/LO system of NTU W-band interferometer array", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 774116 (15 July 2010); https://doi.org/10.1117/12.857833

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KEYWORDS

Receivers

Mirrors

Optical amplifiers

Telescopes

Transmitters

Analog electronics

Digital signal processing

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