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This paper presents the design and measurement results of a W-band two-stage differential amplifier using transformers in 28-nm CMOS FDSOI. At 90 GHz, the amplifier achieves 13.8 dB gain, and the input and output return loss are −8.0 dB and −11 dB, repectively. The amplifier obtains +5 dBm saturated output power and 1-dB output compression point of 0 dBm at the centre frequency. From 85 to 95 GHz,...
This paper presents a 100-GHz vector-sum differential phase shifter in 28-nm CMOS FDSOI. Gilbert-cell type active switches are used to generate 0° and 180° out of phase signals and a 90° hybrid for obtaining I-Q signals. The hybrid is a compact capacitive loaded slow-wave differential branch-line coupler which is 75% smaller than a conventional 90° hybrid. The design has an area of 0.565 mm2 including...
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