Open AccessTunable 500 GHz sensor system in SiGe technology for gas spectroscopy
Author(s) -
Schmalz K.,
Borngräber J.,
Debski W.,
Neumaier P.,
Wang R.,
Kissinger D.,
Hübers H.W.
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2015.1274
Subject(s) - transmitter , subharmonic , transconductance , local oscillator , materials science , spectroscopy , optoelectronics , absorption (acoustics) , phase locked loop , absorption spectroscopy , electrical engineering , analytical chemistry (journal) , physics , optics , chemistry , phase noise , engineering , quantum mechanics , channel (broadcasting) , transistor , nonlinear system , voltage , chromatography
A 500 GHz system for gas spectroscopy is presented, which includes an SiGe 4 × 1 transmitter (TX)‐array, an SiGe subharmonic receiver (RX) and a 1.9 m‐long gas absorption cell. The 120 GHz local oscillators (LOs) of the TX‐array and RX are controlled by two external phase‐locked loops (PLLs), whose reference frequencies are swept. The TX involves a frequency quadrupler. The RX uses a frequency doubler for the 120 GHz LO frequency, which is connected to a subharmonic transconductance mixer. The absorption spectrum of a gaseous mixture of methanol and acetonitrile is measured from 495 to 497 GHz.