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A compact gas spectroscopy system is demonstrated, which contains a transmitter (TX) and a receiver (RX) in SiGe BiCMOS, as well as a gas absorption cell. The sensitivity of this spectroscopy system is demonstrated by measuring the high-resolution 2f absorption spectrum (second harmonic detection) of gaseous methanol (CH3OH) at 238–252 GHz, and at 495–497 GHz. The 245 GHz TX consists of a 120 GHz...
A 245 GHz sensor system for gas spectrosopy 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 PLLs, whose reference frequencies are swept with constant frequency offset for a low IF of the RX. The RX consists of a differential LNA,...
240 GHz transmitter and receiver ICs for a 3D imaging system operating are presented. The transmitter exhibits 0.75 dBm output power at 220 GHz, and features a bandwidth of more than 60 GHz while consuming 55 mA from 3 V supply. The receiver features 14 dB of conversion gain at 220 GHz while consuming 81 mA from a 3 V supply. The circuits were implemented in 0.13μm SiGe:C BiCMOS technology with fT...
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