CC BY 4.0 UnportedSchmalz, K.Rothbart, N.Eissa, M.H.Borngräber, J.Kissinger, D.Hübers, H.-W.2021-08-312021-08-312019https://oa.tib.eu/renate/handle/123456789/6636https://doi.org/10.34657/5683This paper presents transmitter and receiver components for a gas spectroscopy system. The components are fabricated in IHP's 0.13 μm SiGe BiCMOS technology. Two fractional-N phase-locked loops are used to generate dedicated frequency ramps for the transmitter and receiver and frequency shift keying for the transmitter. The signal-to-noise ratio (SNR) for the absorption line of gaseous methanol (CH 3 OH) at 247.6 GHz is used as measure for the performance of the system. The implemented mixer-first receiver allows a high performance of the system due to its linearity up to an input power of -10 dBm. Using a transmitter-array with an output power of 7 dBm an SNR of 4660 (integration time of 2 ms for each data point) was obtained for the 247.6 GHz absorption line of CH 3 OH at 5 Pa. We have extended our single frequency-band system for 228 - 252 GHz to a 2-band system to cover the range 222 - 270 GHz by combining corresponding two transmitters and receivers with the frequency bands 222 - 256 GHz and 250 - 270 GHz on single transmitter- and receiver-chips. This 2-band operation allows a parallel spectra acquisition and therefore a high flexibility of data acquisition for the two frequency-bands. The 50 GHz bandwidth allows for highly specific and selective gas sensing. © 2019 Author(s).enghttps://creativecommons.org/licenses/by/4.0/530BiCMOS technologyBismuth alloysData acquisitionSi-Ge alloysTransmittersAbsorption linesFractional-N phase-locked loopsHigh flexibilityIntegration timeSiGe BiCMOS technologySingle frequencyTransmitter and receiverTransmitter arraySignal to noise ratioArticle