A 10.24-GHz-wide digital spectrometer array system for LMT-FINER: system design and laboratory performance verification

Masato Hagimoto; Akio Taniguchi; Yoichi Tamura; Norika Okauchi; Hiroaki Kawamoto; Taku Nakajima; Takumi Hikosaka; Kenichi Harada; Toru Taniguchi; Takeshi Kamazaki; Takeshi Sakai; Kunihiko Tanaka; Ryohei Kawabe

doi:10.1117/12.3018296

16 August 2024 A 10.24-GHz-wide digital spectrometer array system for LMT-FINER: system design and laboratory performance verification

Masato Hagimoto, Akio Taniguchi, Yoichi Tamura, Norika Okauchi, Hiroaki Kawamoto, Taku Nakajima, Takumi Hikosaka, Kenichi Harada, Toru Taniguchi, Takeshi Kamazaki, Takeshi Sakai, Kunihiko Tanaka, Ryohei Kawabe

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 131020V (2024) https://doi.org/10.1117/12.3018296
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

For efficient spectroscopic redshift identification of early galaxies in the northern hemisphere, we aim to combine the Large Millimeter Telescope (LMT) with a wide-band heterodyne receiver, FINER, which will cover radio frequencies of 120–360 GHz and offer a 3–21 GHz intermediate frequency (IF) per sideband and polarization. To take full advantage of such wide IFs, we present a novel 10.24-GHz-wide digital spectrometer, DRS4 (Elecs Industry Co., Ltd.). It incorporates 20.48 Gsps samplers with an FPGA-based digital signal processing module. To mitigate the noise contamination from the image sideband, it is equipped with a digital sideband separation function to improve the sideband rejection up to 25 dB. Laboratory performance evaluations show that it exhibits an Allan time of at least ~ 100 s and a total power dynamic range of at least 7 dB. These results demonstrate its capability of instantaneously wide-band spectroscopy toward high-redshift galaxies with position-switching observations.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Masato Hagimoto, Akio Taniguchi, Yoichi Tamura, Norika Okauchi, Hiroaki Kawamoto, Taku Nakajima, Takumi Hikosaka, Kenichi Harada, Toru Taniguchi, Takeshi Kamazaki, Takeshi Sakai, Kunihiko Tanaka, and Ryohei Kawabe "A 10.24-GHz-wide digital spectrometer array system for LMT-FINER: system design and laboratory performance verification", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131020V (16 August 2024); https://doi.org/10.1117/12.3018296

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