Title :
Tunable 500 GHz sensor system in SiGe technology for gas spectroscopy
Author :
Schmalz, K. ; Borngra?Œ?†ber, J. ; Debski, W. ; Neumaier, P. ; Wang, R. ; Kissinger, D. ; Hu?Œ?†bers, H.-W.
Author_Institution :
IHP, Frankfurt (Oder), Germany
Abstract :
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.
Keywords :
Ge-Si alloys; gas sensors; millimetre wave mixers; millimetre wave oscillators; millimetre wave receivers; organic compounds; radio transceivers; semiconductor materials; 4 × 1 transmitter array; SiGe; SiGe technology; frequency 500 GHz to 120 GHz; gas absorption cell; gas spectroscopy; size 1.9 m; subharmonic receiver; tunable sensor system;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2015.1274
