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245 GHz SiGe sensor system for gas spectroscopy

Published online by Cambridge University Press:  05 February 2015

Klaus Schmalz ,
Ruoyu Wang ,
Wojciech Debski ,
Heiko Gulan ,
Johannes Borngräber ,
Philipp Neumaier  and
Heinz-Wilhelm Hübers
Klaus Schmalz*
Affiliation:
IHP, Frankfurt, Oder D-15236, Germany. Phone: +49 335 5625 763
Ruoyu Wang
Affiliation:
IHP, Frankfurt, Oder D-15236, Germany. Phone: +49 335 5625 763
Wojciech Debski
Affiliation:
Silicon Radar GmbH, Frankfurt, Oder D-15236, Germany
Heiko Gulan
Affiliation:
Karlsruhe Institute of Technology, Karlsruhe D-76021, Germany
Johannes Borngräber
Affiliation:
IHP, Frankfurt, Oder D-15236, Germany. Phone: +49 335 5625 763
Philipp Neumaier
Affiliation:
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Berlin D-12489, Germany
Heinz-Wilhelm Hübers
Affiliation:
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Berlin D-12489, Germany Department of Physics, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany
*
Corresponding author: K. Schmalz Email: [email protected]
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Abstract

A 245 GHz sensor system for gas spectroscopy is presented, which includes a SiGe receiver (RX), a SiGe transmitter (TX), and a 0.6 m long gas absorption cell between the TX and RX. The integrated local oscillators of the RX and the TX are controlled by two external phase locked loops (PLLs), whose reference frequencies are swept with constant frequency offset for a low IF of the RX. The RX consists of a differential low noise amplifier (LNA), an integrated 122 GHz local oscillator (LO) with 1/64 divider, a 90° differential hybrid, and active subharmonic mixer. The TX consists of an integrated 122 GHz LO with 1/64 divider, and a frequency doubler. The RX and TX are fabricated in 0.13 µm SiGe BiCMOS with ft/fmax of 300/500 GHz. Using external dielectric lenses for the TX and RX, the absorption spectrum of gaseous methanol has been measured. The reference frequency of the TX-PLL is modulated for frequency-modulation spectroscopy. The performance of the sensor system is demonstrated by measuring the 2f absorption spectrum (second harmonic detection) of gaseous methanol.

Keywords

SiGemm-waveSensorGas spectroscopy
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Special Issue 3-4: European Microwave Week 2014 , June 2015 , pp. 271 - 278
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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References

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