122 GHz transmitter using frequency doublers

122 GHz transmitter using frequency doublers,10.1109/SIRF.2011.5719319,Neelanjan Sarmah,Klaus Schmalz,Wolfgang Winkler,Christoph J Scheytt,Srdjan Glis

122 GHz transmitter using frequency doublers   (Citations: 1)
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In this work, a 122 GHz transmitter circuit using frequency doublers is realized in 0.13 "m SiGe:C BiCMOS technology with fT/fmax of 250/315 GHz. Two versions of the frequency doubler based on the balanced topology with cascode transistor are implemented. In the basic version, the peak conversion gain was /9 dB with /6 dBm output p ower. In the improved version the peak conversion gain is improved to / 6 dB with /3 dBm peak output power by using open stubs as second harmonic reflectors. A transmitter is realized by combining a VCO working from 59/62 GHz with the basic version of the doubler. The transmitter output power is from / 3.5 to /5.5 dBm in the output frequency range of 118/122 GHz. Index Terms — SiGe technology, millimeter/wave circuits, VCO, frequency doublers, transmitter, 122 GHz.
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