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Gas spectroscopy system with 245 GHz transmitter and receiver in SiGe BiCMOS

Schmalz, K. and Rothbart, Nick and Borngräber, J. and Yilmaz, Berk and Kissinger, D. and Hübers, H.-W. (2017) Gas spectroscopy system with 245 GHz transmitter and receiver in SiGe BiCMOS. In: Proc. SPIE 10103, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X. SPIE Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X, 28. Jan. - 02. Feb 2017, San Francisco, USA. DOI: 10.1117/12.2250030

Full text not available from this repository.

Official URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2607642

Abstract

The implementation of an integrated mm-wave transmitter (TX) and receiver (RX) in SiGe BiCMOS or CMOS technology offers a path towards a compact and low-cost system for gas spectroscopy. Previously, we have demonstrated TXs and RXs for spectroscopy at 238 -252 GHz and 495 - 497 GHz using external phase-locked loops (PLLs) with signal generators for the reference frequency ramps. Here, we present a more compact system by using two external fractional-N PLLs allowing frequency ramps for the TX and RX, and for TX with superimposed frequency shift keying (FSK) or reference frequency modulation realized by a direct digital synthesizer (DDS) or an arbitrary waveform generator. The 1.9 m folded gas absorption cell, the vacuum pumps, as well as the TX and RX are placed on a portable breadboard with dimensions of 75 cm x 45 cm. The system performance is evaluated by high-resolution absorption spectra of gaseous methanol at 13 Pa for 241 - 242 GHz. The 2f (second harmonic) content of the absorption spectrum of the methanol was obtained by detecting the IF power of RX using a diode power sensor connected to a lock-in amplifier. The reference frequency modulation reveals a higher SNR (signal-noise-ratio) of 98 within 32 s acquisition compared to 66 for FSK. The setup allows for jumping to preselected frequency regions according to the spectral signature thus reducing the acquisition time by up to one order of magnitude

Item URL in elib:https://elib.dlr.de/113403/
Document Type:Conference or Workshop Item (Speech)
Title:Gas spectroscopy system with 245 GHz transmitter and receiver in SiGe BiCMOS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmalz, K.ihp frankfurt, oderUNSPECIFIED
Rothbart, Nicknick.rothbart (at) dlr.deUNSPECIFIED
Borngräber, J.ihp frankfurt, oderUNSPECIFIED
Yilmaz, Berksilicon radarUNSPECIFIED
Kissinger, D.ihp frankfurt, oderUNSPECIFIED
Hübers, H.-W.UNSPECIFIEDUNSPECIFIED
Date:January 2017
Journal or Publication Title:Proc. SPIE 10103, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1117/12.2250030
Status:Published
Keywords:SiGe, mm-wave, sensor, gas spectroscopy, PLL, DDS
Event Title:SPIE Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X
Event Location:San Francisco, USA
Event Type:international Conference
Event Dates:28. Jan. - 02. Feb 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management (old)
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - Optimode.net (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Rothbart, Nick
Deposited On:25 Jul 2017 13:56
Last Modified:25 Jul 2017 13:56

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