Abstract
We report on a terahertz/millimeter-wave gas spectroscopy sensor system based on a 245 GHz transmitter (TX) and receiver (RX) fabricated in SiGe BiCMOS technology. The frequency is tuned by applying external voltages to voltage-controlled oscillators of the TX and the RX. Exemplary $2f$ spectra of methanol are presented that exhibit a high SNR of up to 560 and a short acquisition time as short as 39 s, respectively.
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